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Solvent accessibility studies on glycosaminoglycans

P Kaliannan1, M M Gromiha, K Ramamurthi

  • 1Department of Physics, Bharathidasan University, India. phys@bdu.ernet.in

Biophysical Chemistry
|September 22, 1998
PubMed
Summary

Theoretical calculations reveal glycosaminoglycans (GAGs) have varying solvent accessible surface areas (ASA). Heparin

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Area of Science:

  • Biochemistry and Molecular Modeling
  • Carbohydrate Chemistry

Background:

  • Glycosaminoglycans (GAGs) are crucial biomolecules with diverse biological roles.
  • Understanding their surface properties is key to elucidating molecular interactions.

Purpose of the Study:

  • To theoretically calculate the solvent accessible surface area (ASA) of common glycosaminoglycans (GAGs).
  • To analyze the contribution of different atoms and residues to the overall ASA.
  • To investigate the impact of protein complexation and conformational flexibility on GAG accessibility.

Main Methods:

  • Application of the Lee and Richards solvent accessibility technique.
  • Theoretical calculations of atomic and molecular solvent accessible surface areas.
  • Analysis of residue-specific and atom-specific ASA contributions.

Main Results:

  • Average ASA variation for different atoms ranges from 2-28 Ų.
  • Carbon and oxygen atoms exhibit significantly higher ASA compared to nitrogen and sulfur.
  • Heparin complexed with proteins shows reduced solvent accessibility.
  • Iduronic acid's conformational flexibility leads to varied ASA.
  • Sulfate groups contribute 50% to heparin's total ASA.
  • D-configuration residues generally possess higher ASA than L-configuration residues.

Conclusions:

  • The study provides quantitative insights into the surface properties of GAGs.
  • Atomic and residue-level analysis reveals key determinants of GAG solvent accessibility.
  • Conformational flexibility and specific functional groups (e.g., sulfate) significantly influence GAG interactions.

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