Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Microbiology and Biotechnology
Journal Basic Information
Journal DOI :
The Korean Society for Applied Microbiology and Biotechnology
Editor in Chief :
Volume & Issues
Volume 4, Issue 4 - Dec 1994
Volume 4, Issue 3 - Sep 1994
Volume 4, Issue 2 - Jun 1994
Volume 4, Issue 1 - Mar 1994
Selecting the target year
Effect of Transcription Terminators on Expression of Human Lipocortin-1 in Recombinant Saccharomyces cerevisiae
Chung, Bong-Hyun ; Kim, Byung-Moon ; Nam, Soo-Wan ; Park, Young-Hoon ;
Journal of Microbiology and Biotechnology, volume 4, issue 4, 1994, Pages 237~244
The vector systems for the expression and secretion of human lipocortin-l (LC1) from Saccharomyces cerevisiae were constructed with GAL10 promoter and the prepro leader sequence of mating factor-
1. They were further constructed to contain three different transcription terminators; GAL7 terminator, LCl terminator and a fused form of these two terminators. The expression and secretion levels of LCl were compared to investigate the effect of transcription terminators on the LCl gene expression. For the expression cassettes employing the GAL7 terminator or the terminator of fused form, the expression levels of LCl were measured by scanning the immunoreactive LCl protein bands, and were found to be 0.27 g/l and 0.32 g/l, respectively. The highest expression level of 0.54 g/l was obtained with the expression vector containing the LCl transcription terminator. In all expression cassettes, the majority of LCl proteins expressed were retained intracellularly, indicating a low secretion efficiency of about 5%. The high expression level of LCl was explained by the great content and stability of LCl mRNA transcribed from the LCl terminator-employing vector. The results of this study demonstrate that the LCl transcription terminator functions for the expression of LCl in S. cerevisiae better than the GAL7 terminator.
Effects of R100 Mutant MerR on Regulation of mer Operon from Shigella flexneri
Yoon, Kyung-Pyo ;
Journal of Microbiology and Biotechnology, volume 4, issue 4, 1994, Pages 245~249
An amino-terminal 14 amino acids deletion and three site-directed mutations were created to investigate the mechanism of induction and repression of MerR regulatory protein in R100 mer operon from gramnegative Shigella flexneri. The amino-terminal 14 amino acids deletion, Cysl17Ser, and Cys126Ser mutations abolished the inducibility of the mer operon and the Hisl18Ala mutation resulted in the reduction of inducibility (about 9.1 % remaining) in complementation experiment in the presence of
at subtoxic level (
). The complementation experiment with
absent showed that Hisl18Ala, Cys126Ser, and wild-type MerR could repress the operon but Cysl17Ser could not, and the amino-terminal deletion mutant could neither induce nor repress the R100 mer operon.
Overproduction and Operator DNA-Protein Blotting of R100 Mutant MerR from Shigella flexneri
Yoon, Kyung-Pyo ;
Journal of Microbiology and Biotechnology, volume 4, issue 4, 1994, Pages 250~255
Wild-type and four mutant R100 merR genes were cloned and the proteins overproduced under tac promoter control of pKK223-3. His118Ala, Cys117Ser, Cys126Ser, and wild-type MerR were successfully overproduced although amino-terminal 14 amino acids deletion mutant MerR was not successful. The amount of overproduced wild-type MerR protein as well as other mutant MerR was between 15%-20% of the total protein. The protein was able to be purified up to 95% homogeneity. Specific DNA-protein blotting experiments showed that the 95 bp operator containing DNA fragment could bind to Cys126Ser, His118Ala, and wild- type MerR, but not to Cys117Ser. These results were consistent with the previously reported complementation experiment results that His118Ala, Cys126Ser, and wild-type MerR could repress the mer operon but Cys117Ser could not.
Molecular Characterization of AceB, a Gene Encoding Malate Synthase in Corynebacterium glutamicum
Lee, Heung-Shick ; Anthony j. sinkey ;
Journal of Microbiology and Biotechnology, volume 4, issue 4, 1994, Pages 256~263
The aceB gene, encoding for malate synthase, one of the key enzymes of glyoxylate bypass, was isolated from a pMT1-based Corynebacterium glutamicum gene library via complementation of an Escherichia coli aceB mutant on an acetate minimal medium. The aceB gene was closely linked to aceA, separated by 598 base pairs, and transcribed in divergent direction. The aceB expressed a protein product of Mr 83, 000 in Corynebacterium glutamicum which was unusually large compared with those of other malate synthases. A DNA-sequence analysis of the cloned DNA identified an open-reading frame of 2, 217 base pairs which encodes a protein with the molecular weight of 82, 311 comprising 739 aminoo acids. The putative protein product showed only limited amino acid-sequence homology to its counteliparts in other organisms. The N-terminal region of the protein, which shows no apparent homology with the known sequences of other malate synthases, appeared to be responsible for the protein s unusually large size. A potential calciumbinding domain of EF-hand structure found among eukaryotes was detected in the N-terminal region of the deduced protein.
Nucleotide Sequence Analysis of the RNA-dependent RNA Polymerase Gene of Infectious Pancreatic Necrosis Virus DRT Strain
Lee, Hyung-Hoan ; Chung, Hye-Kyung ; Lee, Seong-Hun ;
Journal of Microbiology and Biotechnology, volume 4, issue 4, 1994, Pages 264~269
To determine the nucleotide sequence of the ds RNA segment B containing the RNA dependent RNA polymerase (RdRp) gene of the DRT strain of infectious pancreatic necrosis virus (lPNV), the cDNA of the ds RNA segment B of the DRT strain of IPNV was synthesized using the reverse transcriptase (RT)-polymerase chain reaction (PCR) and its cDNA nucleotide sequence was determined. The DRT segment B was 2, 783 bp long and contained only a single long open reading frame (ORF) of 2, 535 bp in length. This ORF nucleotides encoded the VPl protein, the putative RdRp of IPNV. The VPl protein comsisted of 845 amino acids. The molecular weight of the RdRp, as deduced from the nucleotide sequence, is 94, 426. The nucleotide sequence of the ORF of the DRT showed 89.7% homology to the Jasper strain, but 80.8% to the Sp strain. The amino acid sequence of the ORF of the DRT sho.wed 97.6% homology to the Jasper strain, but 88.7% to the Sp strain. The conserved GTP-binding motif was detected in VPl protein.
Degradation Properties of n-Alkane Assimilating Pseudomonas putida 3SK Carrying
Plasmid and NAH Plasmid
Chun, Hyo-Kon ; Cho, Kyung-Yun ; Kho, Yung-Hee ;
Journal of Microbiology and Biotechnology, volume 4, issue 4, 1994, Pages 270~273
Pseudomonas putida 3SK, which was constructed by the conjugal transfet of the
plasmid of Pseudomonas putida CSnA and the NAH plasmid of Pseudomonas putida KCTC 2403 into n-alkane assimilating Pseudomonas putida KCTC 2405, showed a broad degradation spectrum and floc-forming ability. This strain degraded m-toluic acid, naphthalene, camphor and decane simultaneously.
at the concentration of 1 ppm in the minimal medium could not inhibit the growth of this strain. The degradation of m-toluic acid by Pseudomonas putida 3SK was not repressed by the easily utilizable compounds, such as glucose and succinate. But, the addition of formalin inhibited the growth of Pseudomonas putida 3SK. After the cultivation of this strain on the artificial wastewater containing m-toluic acid, naphthalene, camphor and decane for 24 hr, the initial COD value (1500) of the artificial wastewater was declined to 300.
Cell Cycle Regulated Expression of Subcloned Chicken H3 Histone Genes and Their 5' Flanking Sequences
Son, Seung-Yeol ; Tae, Gun-Sik ;
Journal of Microbiology and Biotechnology, volume 4, issue 4, 1994, Pages 274~277
We subcloned two chicken H3 histone genes and transfected them into Rat 3 cell line. One contains 300 bp 5' to its cap site and the other contains 130 bp 5' to its cap site when cloned into plasm ids. Both of them showed 5' phase specific expression of their mRNA about 8 fold higher (during 5' phase) than during Gl phase. This means that only 130 bp 5' to its cap site was enough to confer cell cycle regulated expression of the latter gene. The DNA sequences of their 5' flanking region did not reveal any particular homologies or subtype-specific sequences. The DNA sequence data also showed that even though the protein coding regions of the histone genes have been conserved exceptionally well throughout evolution, their 5' untranslated regions have not been conserved as well.
Isolation and Characterizaton of Plasmids from Streptomyces
Joe, Young-Ae ; Goo, Yang-Mo ;
Journal of Microbiology and Biotechnology, volume 4, issue 4, 1994, Pages 278~284
Streptomyces spp. purchased from American Type Culture Collection and Institute for Fermentation in Osaka, and donated from Northem Regional Research Laboratory, and those isolated from soil samples were assayed to isolate many plasmids harboring streptomycetes. Among these qrganisms, 5 small size-plasmid carrying organisms SNUS 8810-597A, 8810-600, 8810-754, 8811-344, and 8811-347 were characterized and their plasmids pSJ597, pSJ600, pSJ754, pSJ344, and pSJ347 were isolated in a large scale. The plasmid harboring organisms were sensitive to neomycin, kanamycin, gentamicin, and thiostreptone, but some of them showed weak or strong resistance against streptomycin, chloramphenicol, ampicillin, and tetracycline. It was confirmed that pSJ597 and pSJ600 do not carry antibiotic biosynthetic genes. pSJ600 showed a pock-forming character.
Construction of Recombinant Xanthomonas campestris Strain Producing Insecticidal Protein of Bacillus thuringiensis
Shin, Byung-Sik ; Koo, Bon-Tag ; Choi, Soo-Keun ; Park, Seung-Hwan ;
Journal of Microbiology and Biotechnology, volume 4, issue 4, 1994, Pages 285~289
An insecticidal crystal protein gene, cryIA(c), from Bacillus thuringiensis HD-73 was integrated into the chromosome of a xanthan-producing bacterium, Xanthomonas campestris XP92. The cryIA(c) gene expression cassette was constructed that placed the gene between the trc promoter and rrnB transcriptional terminator. The
gene was also included to prevent the expression of cryIA(c) gene in X campestris cells. Southem blot analysis confirmed the integration of the cryIA(c) gene expression cassette in chromosome of X campestris XP92 transconjugant. Expression of the insecticidal crystal protein was confirmed by Western blot analysis and bioassay against the larvae of Hyphantria cunea (Lepidoptera： Arctiidae) and Plutella xylostella (Lepidoptera：Plutellidae).
Production and Characterization of Monoclonal Antibodies to Bacillus thuringiensis subsp. canadensis
Jung, Jae-Deuk ; Park, Jung-Sun ; Jo, Yung-Soo ; Hong, Soon-Bok ; Lee, Hyung-Hoan ; Cho, Myung-Hwan ;
Journal of Microbiology and Biotechnology, volume 4, issue 4, 1994, Pages 290~295
30 monoclonal antibodies (mAbs) were produced against Bacillus thuringiensis subsp. canadensis. Out of the these, 6 mAbs were selected for further studies. SDS-PAGE analyses of sonicated antigens of 10 8. thuringiensis strains showed that they generally had both predominant protein antigens of molecular weights of 45 kilodalton (kd) except for shandogiensis and konkukian, and 37kd except for israelensis, tochigiensis, and shandogiensis, respectively. These results indicate that 4kd and 37kd may be important for demonstrating common antigens except for a few strains of B. thuringiensis. In comparing the result of the westem blot using mAbs with that of using polyclonal antibodies to canadensis, we found that immunoreactive proteins of 99 and 39 kd were identified as common antigens, which might act as antigenic determinants, and might be surface or flagella antigens. Reactivities of mAbs with 41 strains of 8. thuringiensis demonstrated that mAbs of C-1, C-3, C-4, C-S and C-6 except C-2 did not recognize epitopes of thuringiensis, but that all of the mAbs recognized epitopes of galleriae, kurstaki, dakota, tolrJokuensis, silo, toguchini, and leesis. The potential applications of the mAbs we produced would be useful tools for the clarification of taxonomy, investigation of antigenic relationship between B. thuringiensis strains, and localization of specific surface and flagella antigens.
Antifungal Mechanism and Properties of Antibiotic Substances produced by Bacillus subtilis YB-70 as a Biological Control Agent
Kim, Yong-Su ; Kim, Sang-Dal ;
Journal of Microbiology and Biotechnology, volume 4, issue 4, 1994, Pages 296~304
Antibiotic substances were produced by Bacillus subtilis YB-70, a potential biocontrol agent found to suppress root-rot of eggplant (Solanum melonggena L) caused by Fusarium solani, in a dextrose glutamate medium and isolated by isoelectric precipitation. Partial purification was performed by column chromatography on silica gel with two solvent systems: chloroform-methanol and methanol-chloroform-water as eluting solvents, This active fraction YBS-1 s contained antifungal activity were soluble in ethanol, methanol, and water, but were not soluble in other solvents including acetone, butanol, ethyl ether, dimethylformamide, propanol, and etc. High performance liquid chromatography and thin layer chromatographic separation of YBS-1s showed that they have been composed of three biological active bands that were named YBS-1A, -1B, and -1C. The substances were stable to heat and resistant to protease. YBS-1s were active against a wide range of plant pathogenic fungi but did not inhibit the growth of bacteria and yeasts. They were not only fungicidal but also fungistatic against chlamydospores of F. solani. The
values for the chlamydospore germination and the germ-tube growth of F. solani were
, respectively. Microscopic observations proved the substances restricted the growth of phytopathogenic fungus F. solani by spore burst followed by dissolving of its germ-tube, and caused abnormal hyphal swelling after application to chlamydospores or growing hyphae. Cultural filtrate of B; subtilis YB-70 also suppressed the development of root-rot of eggplant in pot tests.
Identification of Bacteriocin-producing Lactic Acid Bacteria from Kimchi and Partial Characterization of their Bacteriocin
Ha, Duk-Mo ; Cha, Dong-Soo ;
Journal of Microbiology and Biotechnology, volume 4, issue 4, 1994, Pages 305~315
Nineteen strains of bacteriocin-producing lactic acid bacteria were isolated from 432 Kimchi samples, and identified by the comprehensive biochemical and morphological tests verifying their cellular fatty acid composition. Using partially purified bacteriocins from these isolates, their inhibitory activities against other lactic acid bacteria and some pathogens, and sensitivity to enzyme and heat treatments were tested. The isolates were identified as Lactobacillus plantarum (2 strains), L curvatus (2 starins), L brevis (2 strains), Enterococcus faecium (6 strains), Leuconostoc mesenteroides subsp. mesenteroides (1 strain) and Lactobacillus sp. (6 strains). The bacteriocins produced by E. faecium strains provided the broadest spectrum of inhibition, affecting against other Gram-positive bacteria including lactic acid bacteria and health-threatening bacteria such as Clostridium perfringens and Listeria monocytogenes. The bacteriocins of Lactobacillus sp., L plantarum and L brevis strains were capable of inhibiting many strains of the lactic acid bacteria, whereas those of L curvatus and L mesenteroides subsp. mesenteroides strains were only inhibitory to a few strains. Generally, the inhibitory activities of both E. faecium and Lactobacillus sp. strains were greater than those of other producer strains. The bacteriocins from the isolates were sensitive to several proteolytic enzymes, and those of L curvatus and L mesenteroides subsp. mesenteroides were also sensitive to lipase and
-amylase as well as to proteolytic enzymes. The bacteriocins from the strains of Lactobacillus sp. and a strain of L. brevis were resistant to autoclaving.
Application of Thermotolerant Yeast at High Temperature in Jar-fermentor Scale.
Sohn, Ho-Yong ; Kim, Young-Ho ; Rhee, In-Koo ;
Journal of Microbiology and Biotechnology, volume 4, issue 4, 1994, Pages 316~321
We investigated the possibility of industrial application and economit process of high temperature fermentation by thermotolerant alcohol producing yeasts as previously reported. From the 20% glucose media, the RA-74-2 produced 11.8% (v/v) ethanol at
(0.5% inoculum) and 10.6% (v/v) ethanol at
(3% inoculum), respectively. Also, 11.3% (v/v) ethanol was produced for 96 hours in the temperature-gradient fermentation. These results suggest that the RA-74-2 could isuccessfully be applied to save the cooling water and energy in industrial scale without re-investment or modification of established fermentation systems. When potato starch was used as the substrate for the RA-74-2, high temperature fermentation above
was more appropriate for industrial utilization because organic nitrogen was not necessary to economical fermentation. As the naked barley media just prior to industrial inoculation, taken from the Poongkuk alcohol industry Co., were used, 9.6% (v/v) ethanol was produced at
for 48 hours in jar-fermentor scale (actually, 9.5-9.8% (v/v) ethanol was produced at 30~
for 100 hours in industrial scale). The ethanol productivity was increased by the high glucoamylase activity as well as the high metabolic ratio at
Therefore, if the thermotolerant yeast RA-74-2 would be used in industrial scale, we could obtain a high productivity and saving of the cooling water and energy. Meanwhile, the RA-912 produced 6%(v/v) ethanol in 10% glucose media at
and showed the less ethanol-tolerance compared with industrial strains. As the produced alcohol was recovered by the vacuum evaporator at
in 15% glucose media, the final fermentation ratio was enhanced (76% of theoretical yields). This suggest that a hyperproductive process could be achieved by a continuous input of the substrate and continuous recovery of the product under vacuum in high cell-density culture.
Characterization of Bacillus thuringiensis StrainBT-14 having Insecticidal Activity against Plutella xylostella
Bok, Song-Hae-Jung, Yong-Chul ; Kim, Sung-Uk ; Son, Kwang-Hee ; Lee, Hyung-Hoan ;
Journal of Microbiology and Biotechnology, volume 4, issue 4, 1994, Pages 322~326
Bacillus thuringiensis strain BT-14 was isolated from alfalfa dust in Korea. The strain BT-14 produced one bipyramidal crystal and one spore in the cell. The biochemical characteristics of the strain BT-14 were similar to those of Bacillus thuringiensis subsp. kurstaki HD-l. Examination of its antibiotic resistance revealed that while the strain BT-14 was less resistant than BTK HD-l to ampicillin, gentamycin, neomycin and tobramycin, it was more resistant to amikacin than BTK HD-l. The
-endotoxin crystal of strain BT-14 consisted of a single protein with a high molecular weight of ca 135 KD on a 10% SDS-PACE. The strain BT-14 contained at least nine different plasmids with sizes of 2.9, 5.3, 5.8, 6.2, 9.4, 15.1, 18.1, 23.1 and 79 Kb. In insect bioassay, the isolated strain BT-14 showed lethality of 67% against Plutella xylostella larvae at dilution of 5
l0 to 3
spores/ml), which is, almost equivalent to that of BTK HD-l.
Optimum Conditions for the Production of Tetramethylpyrazine Flavor Compound by Aerobic Fed-batch Culture of Lactococcus lactis subsp. lactis biovar. diacetylactis FC1
HYONG-JOO LEE ; KIM, KWANG-SOO ; DONG-HWA SHON ; DAE-KYUN CHUNG ;
Journal of Microbiology and Biotechnology, volume 4, issue 4, 1994, Pages 327~332
Optimum conditions for the production of acetoin and ammonia as the precursors of tetramethylpyrazine(TMP) were determined using Lactococcus lactis subsp. lactis biovar. diacetylactis FC1 in a modified Lactose-citrate broth containing galactose, citrate, and arginine. The cell growth and the productivity of acetoin and ammonia were remarkably increased in an aerobic culture with 10
of hematin. For the optimum conditions of acetoin and ammonia production, the concentration of citrate and arginine were adjusted to 156 mM and 50 mM after 18 hr cultivation, and citrate and galactose to 156 mM and 50 mM after 36 hr cultivation, respectively. In these conditions, acetoin and ammonia were produced to the final concentration of 127 mM and 195 mM, which were the highest concentations, respectively. The optimum conditions of the TMP production were also determined as follows; 4 hours at 121, pH 8.3, and the maximal yield of TMP under these conditions was 0.81 g/l.
Alcohol Production from Whey in Batch and Continuous Culture of Kluyveromyces fragilis.
Heo, Tae-Ryeon ; Kim, Jong-Soo ; So, Jae-Seong ;
Journal of Microbiology and Biotechnology, volume 4, issue 4, 1994, Pages 333~337
In order to develop the whey beverage, we examined the optimum conditions for alcohol fermentation by Kluyveromyces tragilis ATCC 46537. The optimum conditions for alcohol production by K. fragilis ATCC 46537 were as follows; pH 4.5,
, with a supplement of 50 g/l of lactose. To develop a continuous production of alcohol from whey, we compared batch fermentation with continuous iermentation in conjunction with UF system. Batch fermentation produced 11.0 g/l of alcohol, whereas pseudocontinuous and continuous fermentation with UF system produced 8.5 g/l of alcohol. To increase the alcohol production, we added 50 g/l of lactose to both fermentations. Batch fermentation with lactose supplement produced 15.7 g/l of alcohol and continuous fermentation with lactose supplement in conjunction with UF system produced 15.0 g/l of alcohol. These results clearly demonstrate that the UF system can be used to increase the alcohol production from whey, supplemented with exogenous lactose.
Isolation, Identification, and Culture Conditions of the Strain Producing Eicosapentaenoic Acid
Shin, Won-Cheol ; Kim, Chang-Ho ;
Journal of Microbiology and Biotechnology, volume 4, issue 4, 1994, Pages 338~342
The bacterium producing EPA was isolated from the intestines of the marine fishes. The strains were studied for their identification and their culture conditions. The selected strain was gram negative, rod(0.7
in size) and motile with a single polar flagellum. This strain was identified as a Pseudomonas sp. on the basis of its morphological, cultural and physiological characteristics. The strain showed a maximum productivity of phospholipid at
after 48 hours of culture time with an initia1 pH of 7.0 in the PYM-glucose medium. Under these culture conditions, the production of phospholipid was about 0.3 mg/ml and 0.06 mg/mg dry cell weight.
Isolation and Characterization of Enterobacter sp. Producing Galacto-oligosaccharides
YANG, JI-WON ; HYUN-JAE SHIN ; SANG-PIL YEOM ; BYUNG-DAE YUN ; MIN-HONG KIM ;
Journal of Microbiology and Biotechnology, volume 4, issue 4, 1994, Pages 343~348
Enterobacter sp. producing -
-galactosidase with high transgalactosylation activity was isolated from dairy wastewater. The isolate had common biochemical features to E. aerogenes and E. cloacae. Enzyme production increased as the cell mass increased with optimum enzyme activity of 0.21 Unit/mg-protein (o-nitro-phenyl-
-D-galactoside (ONPG) as substrate) until 8 hr of culture. Whole cells permeabilized by toluene were used to produce galacto-oligosaccharide. Optimum toluene concentration, temperature and pH for -
-galactosidase activity of permeabilized whole cells were 10% (v/v),
and 6.0, respectively. A maximum of 38% (w/w) of galacto-oligosaccharide was obtained with lactose concentration of 20% (w/w) at
and pH 6.0.
Isolation, Physico-chemical Properties, and Biological Activity of New Thiopeptide Antibiotics, Kimorexins
Yeo, Woon-Hyung ; Kim, Si-Kwan ; Kim, Sang-Seock ; Yu, Seung-Hun ;
Journal of Microbiology and Biotechnology, volume 4, issue 4, 1994, Pages 349~353
An isolate 90-GT-302, identified as Kitasatosporia kimorexae, was found to produce antibiotics that induce mycelial swelling in Magnaporthe grisea, and Fusarium solani. The strain produced at least 5 antibiotics. Among them, the main active compound designated as kimorexin A was isolated and its physico-chemical properties and biological activities were examined, and as a result was found to be of the thiopeptide antibiotic. A comparison between the properties of kimorexin A and those of the known thiopeptide antibiotics led us to conclude that kimorexin A was a new thiopeptide polythiazolyl antibiotic. Kimorexin A showed a narrow antimicrobial spectrum against very limited genus of phytopathogenic fungi. It prevented host plants from infections of Rhizoctonia solani and absolute parasitic fungi, such as Sphaerotheca fuliginea and Puccinia recondita, almost completely at the treatment concentration of approximately 20 ppm.
Taxonomy and Fermentation of Kitasatosporia kimorexae Producing New Thiopeptide Antibiotics, Kimorexins
Yeo, Woon-Hyung ; Kim, Si-Kwan ; Kim, Sang-Seock ; Yu, Seung-Hun ;
Journal of Microbiology and Biotechnology, volume 4, issue 4, 1994, Pages 354~359
An isolate, 90-GT-302, was found to produce antibiotics inducing typical mycelial swelling in Magnaporthe grisea and Fusarium solani. This isolate formed yellow substrate and white rectiflexbiles aerial mycelia in the early stages of growth. The aerial mycelium gradually changed its color to white and finally formed a gray spore mass. Analysis of the cell wall acid hydrolysate revealed the presence of LL- and meso-diaminopimelic acids, glycine, and galactose, which indicated cell wall type X. This result placed our isolate in genus Kitasatosporia. A comparison of isolate 9O-GT-302 with reference strains of Kitasatosporia spp., which not only demonstrated several differences in their physiological properties but also novelty of the active compounds produced by this isolate, led us to designate the isolate as Kitasatosporia kimorexae.
A Spectrophotometric Assay for
-Glutamyl Transpeptidase Activity
Hwang, Se-Young ;
Journal of Microbiology and Biotechnology, volume 4, issue 4, 1994, Pages 360~363
A colorimetric assay for
-glutamyl transpeptidase (
-CTP; E.C 220.127.116.11) employing 2, 4, 6-trinitrobenzene sulfonate (TNBS) to detect the amount of disappeared acceptor via transpeptidation, has been developed. Under the experimental conditions using L-
-glutamyl ethyl ester and L-phenylalanine as
-glutamyl donor and acceptor, respectively, it was found that the decreased absorbance of yellow color at 420 nm was strictly related to the amount of L-
-Glu-L-Phe) formed, which was determined by DEAE-cellu-lose column chromatography. Concentrations of the enzyme and
-glutamyl products were able to be determinedin the nanogram and nanomoles per milliliter range, respectively, with high precision and reliability. This novel assay system may therefore be a useful means for understanding of catalytic function of the
-CTP spectrophotometrically without any usage of sophisticated instruments.
Molecular Properties of Streptococcal Nuclease Isolated from Streptococcus sp.
Song, Kyung-Bin ; Lee, Min-Jung ;
Journal of Microbiology and Biotechnology, volume 4, issue 4, 1994, Pages 364~366
Molecular properties of streptococcal nuclease purified from Streptococcus sp. were examined. The purified enzyme was stable in the range of pH 7 to 10 and easily inactivated above
. Atomic spectroscopy analysis indicated that the enzyme contains Ca, Mg, Zn. Circular dichroism study showed 25%
-sheet and 30%