Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Cloning and Sequencing of the Gene Involved in Morphological Change of Zoogloea ramigera 115SLR

  • Published : 2000.04.01
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Abstract

Plasmid pLEX3 isolated from the recombinant cosmid library of Zoogloea ramigera 115 was found to be responsible for the restoration of the rugose colony phenotype. To confirm the essential region responsible for the complementation, subclones were constructed from plasmid pLEX3 and transformed into mutant strain Z. ramigera 115SLR. The recombinant plasmids pLEX10 and pLEX11 were shown to complement the slime-forming property of Z. ramigera 115SLR. In a compositional analysis of the exopolysaccharides from Z. ramigera 115, Z. ramigera 115SLR, and Z. ramigera 115SLR harboring plasmid pLEX11, the exopolysaccharides showed a similar composition with glucose, galactose, and side chain groups. The complete nucleotide sequence of the 3.25kb genocim DNA insert in plasmid pLEX11 was determined and its analysis identified two open reading frames which could encode two proteins. The gene products derived form the two open reading frames were confirmed by and in vivo transcription using a T7-RNA polymerase. The ORF1 produced a 30 kDa protein, whereas the ORF2 was found responsible for the complementation of the morphological mutation and produced a 14 kDa protein. An in vivo gene expression of plasmid pTEX10 showed another open reading frame encoding a 50 kDa protein. The gene products form ORF1 and ORF2 are regarded as novel proteins which do not show any homology with other proteins.

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