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Crystal structure of aprotinin in complex with sucrose octasulfate: unusual interactions and implication for heparin bindingCrystal structure of aprotinin in complex with sucrose octasulfate: unusual interactions and implication for heparin binding
Structural highlights
FunctionBPT1_BOVIN Inhibits trypsin, kallikrein, chymotrypsin, and plasmin. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe 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. Crystal structures of aprotinin and its complex with sucrose octasulfate reveal multiple modes of interactions with implications for heparin binding.,Yang IS, Kim TG, Park BS, Cho KJ, Lee JH, Park Y, Kim KH Biochem Biophys Res Commun. 2010 Jul 2;397(3):429-35. Epub 2010 May 27. PMID:20529698[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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