1fy3: Difference between revisions

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[[Image:1fy3.jpg|left|200px]]
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[[Image:1fy3.png|left|200px]]


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{{STRUCTURE_1fy3|  PDB=1fy3  |  SCENE=  }}  
{{STRUCTURE_1fy3|  PDB=1fy3  |  SCENE=  }}  


'''[G175Q]HBP, A MUTANT OF HUMAN HEPARIN BINDING PROTEIN (CAP37)'''
===[G175Q]HBP, A MUTANT OF HUMAN HEPARIN BINDING PROTEIN (CAP37)===




==Overview==
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Heparin binding protein (HBP) is an inactive serine protease homologue with important implications in host defense during infections and inflammations. Two mutants of human HBP, [R23S,F25E]HBP and [G175Q]HBP, have been produced to investigate structure-function relationships of residues in the putative lipid A/lipopolysaccharide (LPS) binding site and BPTI (bovine pancreatic trypsin inhibitor) binding site. The X-ray structures have been determined at 1.9 A resolution for [G175Q]HBP and at 2.5 A resolution for the [R23S,F25E]HBP mutant, and the structures have been fully refined to R-factors of 18.2 % and 20.7 %, respectively. The G175Q mutation does not alter the overall structure of the protein, but the ability to bind BPTI has been eliminated, and the mutant mediates only a limited stimulation of the LPS-induced cytokine release from human monocytes. The lipid A/LPS binding property of [G175Q]HBP is comparable with that of native HBP. The R23S,F25E mutations do not affect the binding of lipid A/LPS and BPTI or the LPS-induced cytokine release from human monocytes. This shows that two diverse ligands, lipid A/LPS and BPTI, do not share binding sites. Previously, there was convincing evidence for the proposed lipid A/LPS binding site of HBP. Unexpectedly, the extensive structural changes introduced by mutation of Arg23 and Phe25 do not affect the binding of lipid A/LPS, indicating that another not yet identified site on HBP is involved in the binding of lipid A/LPS.
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{{ABSTRACT_PUBMED_11170199}}


==About this Structure==
==About this Structure==
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[[Category: Bpti binding site]]
[[Category: Bpti binding site]]
[[Category: Serine protease homolog]]
[[Category: Serine protease homolog]]
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Revision as of 01:06, 1 July 2008

File:1fy3.png

Template:STRUCTURE 1fy3

[G175Q]HBP, A MUTANT OF HUMAN HEPARIN BINDING PROTEIN (CAP37)

Template:ABSTRACT PUBMED 11170199

About this Structure

1FY3 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Two mutants of human heparin binding protein (CAP37): toward the understanding of the nature of lipid A/LPS and BPTI binding., Kastrup JS, Linde V, Pedersen AK, Stoffer B, Iversen LF, Larsen IK, Rasmussen PB, Flodgaard HJ, Bjorn SE, Proteins. 2001 Mar 1;42(4):442-51. PMID:11170199

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