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Identification and Functional Analysis of Pig β-1,4-N-Acetylglucosaminyltransferase A (MGAT4A)
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  • Journal title : Journal of Life Science
  • Volume 26, Issue 3,  2016, pp.275-281
  • Publisher : Korean Society of Life Science
  • DOI : 10.5352/JLS.2016.26.3.275
 Title & Authors
Identification and Functional Analysis of Pig β-1,4-N-Acetylglucosaminyltransferase A (MGAT4A)
Kim, Ji-Youn; Hwang, Hwan-Jin; Chung, Hak-Jae; Park, Mi-Ryung; Byun, Sung June; Kim, Kyung-Woon;
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 Abstract
Glycan modification is important in pharmaceutical industry. Especially, sialic acid affects the bioactivity and stability of medicine. Milk of pig has been used as bioreactor to produce various pharmaceutical proteins. Therefore, it is necessary to modify the glycan chain in pig mammary grand. β-1,4-N-Acetylglucosaminyltransferase A (pMGAT4A) is one of the essential enzymes for increase of sialic acid content, but pig MGAT4A is unclear. In this study, the pMGAT4A was identified and characterized. The pMGAT4A has 1638 nucleotides encoding 535 amino acids and type II membrane topology, which is one of the common features in many glycosyltransferases. The gene was strongly expressed in liver and mammary gland, whereas was weakly expressed in small intestine, stomach and bladder. For functional test, HA-tagged MGAT4A was over-expressed in porcine kidney (PK-15) cell line. Forced expression of pMGAT4A gene was identified by qPCR, and we identified that pMGAT4A is located in Golgi complex by co- staining with HA antibody and BODIPY TR ceramide. In addition, we identified the increase of mannose-β-1,4-N-acetylglucosamine structure by ELISA and immunofluorescence using Datura stramonium agglutinin (DSA), which recognizes mannose-β-1,4-Nacetylglucosamine. Through the specific activity analysis, we showed that pMGAT4A modified bi-antennary to tri-antennary. This event affects sialic acid content. Therefore, we thought that over-expression of pMGAT4A will be necessary in pig mammary grand for improved medicine.
 Keywords
DSA;PK-15;Pig β-1;4-N-Acetylglucosaminyltransferase A;sialic acid;
 Language
Korean
 Cited by
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