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Characterizing the non-reducing end structure of heparan sulfate
Zhengliang L Wu1, Miroslaw Lech
1Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139.
The Journal of Biological Chemistry
|August 5, 2005
Summary
Researchers identified the non-reducing end of heparan sulfate, revealing a highly sulfated structure crucial for fibroblast growth factor signaling. This finding offers potential insights into tumor pathology and biomarker development.
Area of Science:
- Biochemistry
- Glycobiology
- Cell Biology
Background:
- The structure and function of the reducing end of heparan sulfate are well-established.
- The non-reducing end of heparan sulfate has remained largely uncharacterized.
- Emerging evidence suggests the non-reducing end plays a role in fibroblast growth factor (FGF) signaling complex formation and may be altered in tumor pathology.
Purpose of the Study:
- To identify and characterize the non-reducing end of heparan sulfate from bovine kidney.
- To investigate the potential role of the non-reducing end in FGF signaling.
- To explore its relevance as a potential biomarker in tumor pathology.
Main Methods:
- High-performance liquid chromatography coupled with mass spectrometry (HPLC-MS) was employed.
- Detailed structural analysis of the non-reducing end of heparan sulfate was performed.
Main Results:
- The non-reducing end of bovine kidney heparan sulfate was successfully identified and characterized.
- This region is highly sulfated and initiates with a glucuronic acid (GlcA) residue.
- A likely hexasaccharide sequence was proposed: GlcA-GlcNS6S-UA+/-2S-GlcNS+/-6S-Ido2S-GlcNS+/-6S.
Conclusions:
- The non-reducing end of bovine kidney heparan sulfate is highly sulfated and possesses a defined structure.
- Heparan sulfate non-reducing ends are not significantly trimmed by heparanase.
- The identified structure supports the formation of fibroblast growth factor signaling complexes.