3LDM image
Deposition Date 2010-01-13
Release Date 2010-06-23
Last Version Date 2024-10-30
Entry Detail
PDB ID:
3LDM
Title:
Crystal structure of aprotinin in complex with sucrose octasulfate: unusual interactions and implication for heparin binding
Biological Source:
Source Organism:
Bos taurus (Taxon ID: 9913)
Method Details:
Experimental Method:
Resolution:
2.60 Å
R-Value Free:
0.25
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
P 64 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Pancreatic trypsin inhibitor
Chain IDs:A, B, C, D, E
Chain Length:58
Number of Molecules:5
Biological Source:Bos taurus
Primary Citation
Crystal structures of aprotinin and its complex with sucrose octasulfate reveal multiple modes of interactions with implications for heparin binding.
Biochem.Biophys.Res.Commun. ? ? ? (2010)
PMID: 20529698 DOI: 10.1016/j.bbrc.2010.05.113

Abstact

The crystal structures of aprotinin and its complex with sucrose octasulfate (SOS), a polysulfated heparin analog, were determined at 1.7-2.6A resolutions. Aprotinin is monomeric in solution, which associates into a decamer at high salt concentrations. Sulfate ions serve to neutralize the basic amino acid residues of aprotinin to stabilize the decameric aprotinin. Whereas SOS interacts with heparin binding proteins at 1:1 molar ratio, SOS was surprisingly found to induce strong agglutination of aprotinins. Five molecules of aprotinin interact with one molecule of the sulfated sugar, which is stabilized by electrostatic interactions between the positively charged residues of aprotinin and sulfate groups of SOS. The multiple binding modes of SOS with five individual aprotinin molecules may represent the diverse patterns of potential heparin binding to aprotinin, reflecting the interactions of densely packed protein molecules along the heparin polymer.

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Primary Citation of related structures