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"Coding" and "Decoding": hypothesis for the regulatory mechanism involved in heparan sulfate biosynthesis
Xu Zhang1, Fengshan Wang2, Juzheng Sheng1
1Key Laboratory of Chemical Biology of Natural Products (Ministry of Education), Institute of Biochemical and Biotechnological Drugs, School of Pharmaceutical Sciences, Shandong University, Jinan 250012, China.
Carbohydrate Research
|April 19, 2016
Summary
Heparan sulfate (HS) biosynthesis involves "coding" and "decoding" steps, regulating its structure and function. This research proposes a novel template-independent mechanism for HS chain regulation.
Area of Science:
- Biochemistry
- Glycoscience
- Molecular Biology
Background:
- Heparan sulfate (HS) proteoglycans are crucial in mammalian tissues, involved in numerous physiological and pathological processes.
- Unlike DNA and protein synthesis, HS biosynthesis is not template-guided, yet its final structure is strictly regulated.
Purpose of the Study:
- To propose a novel hypothesis for the regulation of heparan sulfate biosynthesis.
- To elucidate the proposed "coding" and "decoding" mechanisms governing HS structure and biological activity.
Main Methods:
- Investigated the role of N-deacetylase/N-sulfotransferase isozymes in the "coding" step of HS biosynthesis.
- Examined the function of modification enzymes in the "decoding" of HS coding sequences.
Main Results:
- The distribution of sulfate groups on glucosamine residues acts as the "coding" mechanism in HS biosynthesis.
- Specific modification enzymes recognize these "coding" sequences for HS chain structure determination (the "decoding" process).
Conclusions:
- Heparan sulfate biosynthesis is regulated by a two-step "coding" and "decoding" process, not a template.
- The precise sulfation and epimerization patterns dictate HS interactions with protein factors, thereby controlling biological activity.
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