The relationship between the N-glycosylation of acetylglucosaminyltransferase V and its activity.
CHINESE MEDICAL SCIENCES JOURNAL = CHUNG-KUO I HSUEH K'O HSUEH TSA CHIH 2000;
15:79-82. [PMID:
12901628]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/04/2023]
Abstract
OBJECTIVE
The goal of this paper is to investigate the relationship between the N-glycosylation of acetylglucosaminyltransferase V (GlcNAcT-V) and its activity and to know which site among the 6 N-glycosylation sites in the GlcNAcT-V gene is the most important.
METHODS
Wild type of GlcNAcT-V was transfected into COS-7 cells and its activity was measured 48 h later. The first site (Asn 110) was mutated with site-directed mutagenesis and transfected into COS-7 cells.
RESULTS
It was found that after the cells were added tunicamycin (TM, 1 microg/ml), the activity was 11.7% of the wild type. The activity of the cells with mutating GlcNAcT-V was about 12.0% of the wild type. RT-PCR showed that there was no significant change in mRNA expression among the three groups.
CONCLUSION
The N-glycosylation is important for its activity. Our results suggest that the N-linked carbohydrates on GlcNAcT-V are required for the posttranscriptional activity of the enzyme.
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