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Targeting Cysteine Thiols for in Vitro Site-specific Glycosylation of Recombinant Proteins
Published on: October 4, 2017
O-glycosylation regulates polarized secretion by modulating Tango1 stability
Liping Zhang1, Zulfeqhar Ali Syed2, Iris van Dijk Härd3
1Developmental Glycobiology Section, Laboratory of Cell and Developmental Biology, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD 20892-4370;
O-glycosylation regulates secretion by protecting Tango1 protein from cleavage. Loss of PGANT4 causes secretion defects, which can be rescued by restoring Tango1 or inhibiting furin protease.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Polarized secretion is vital for tissue function.
- O-glycosylation is a conserved modification influencing secretion, but its mechanisms are unclear.
- Tango1 (Transport and Golgi organization 1) is essential for secretion.
Purpose of the Study:
- To investigate the role of O-glycosylation in regulating secretion.
- To identify the molecular mechanisms linking O-glycosylation to secretion.
- To explore the therapeutic potential for diseases related to O-glycosylation defects.
Main Methods:
- In vivo studies using genetic manipulation (loss-of-function and rescue experiments).
- Analysis of protein glycosylation and proteolysis.
- Assessment of secretory vesicle formation and apical secretion.
Main Results:
- The O-glycosyltransferase PGANT4 was identified as a novel regulator of secretion.
- PGANT4 glycosylates Tango1, protecting it from furin-mediated cleavage.
- Loss of PGANT4 led to Tango1 cleavage, reduced secretory granules, and impaired apical secretion.
- Overexpression of Tango1 or knockdown of furin (Dfur2) rescued the secretory defects.
Conclusions:
- Secretion is regulated by a balance between O-glycosylation and proteolytic cleavage.
- Modulating protease activity may offer therapeutic strategies for diseases linked to O-glycosylation loss.
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