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Surface Engineering of Pancreatic Islets with a Heparinized StarPEG Nanocoating

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Published on: June 23, 2018

Structural snapshots of heparin depolymerization by heparin lyase I.

Young-Hyun Han¹, Marie-Line Garron, Hye-Yeon Kim

¹Magnetic Resonance Team, Korea Basic Science Institute, Ochang, Chungbuk 363-883, Korea.

The Journal of Biological Chemistry

|October 6, 2009

Summary

Heparin lyase I (heparinase I) crystal structures reveal its unique beta-jellyroll domain and thumb-like extension crucial for heparin depolymerization. These findings offer insights into enzyme activity and substrate recognition.

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Area of Science:

Biochemistry
Structural Biology
Enzymology

Background:

Heparin lyase I (heparinase I) is an enzyme that specifically depolymerizes heparin.
Heparin is a complex polysaccharide with important biological functions.

Purpose of the Study:

To determine the crystal structures of heparinase I from Bacteroides thetaiotaomicron at various reaction stages.
To elucidate the structural basis for heparinase I's catalytic mechanism, substrate recognition, and processivity.

Main Methods:

X-ray crystallography to obtain structures of heparinase I with heparin oligosaccharides.
Mutational studies to investigate the role of specific residues.
Kinetic analysis to quantify enzyme activity.

Main Results:

The crystal structure reveals a beta-jellyroll domain with a deep substrate-binding groove and a thumb-like extension rich in basic residues.
The thumb extension is critical for activity, particularly with shorter heparin oligosaccharides.
Structural similarity was observed between the active site of heparinase I and heparinase II.
Mutational and kinetic data provided insights into the enzyme's catalytic mechanism and substrate interactions.

Conclusions:

The unique structural features of heparinase I, including its thumb-like extension, are key to its function in heparin degradation.
Understanding heparinase I structure and mechanism can inform the development of new heparin-targeting therapeutics or diagnostic tools.