2o6a: Difference between revisions

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[[Image:2o6a.jpg|left|200px]]
{{Seed}}
[[Image:2o6a.png|left|200px]]


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{{STRUCTURE_2o6a|  PDB=2o6a  |  SCENE=  }}  
{{STRUCTURE_2o6a|  PDB=2o6a  |  SCENE=  }}  


'''Crystal structure of the Haemophilus influenzae E57A mutant FbpA'''
===Crystal structure of the Haemophilus influenzae E57A mutant FbpA===




==Overview==
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The periplasmic iron-binding protein, FbpA (ferric-ion-binding protein A), performs an essential role in iron acquisition from transferrin in Haemophilus influenzae. A series of site-directed mutants in the metal-binding amino acids of FbpA were prepared to determine their relative contribution to iron binding and transport. Structural studies demonstrated that the mutant proteins crystallized in an open conformation with the iron atom associated with the C-terminal domain. The iron-binding properties of the mutant proteins were assessed by several assays, including a novel competitive iron-binding assay. The relative ability of the proteins to compete for iron was pH dependent, with a rank order at pH 6.5 of wild-type, Q58L, H9Q&gt;H9A, E57A&gt;Y195A, Y196A. The genes encoding the mutant FbpA were introduced into H. influenzae and the resulting strains varied in the level of ferric citrate required to support growth on iron-limited medium, suggesting a rank order for metal-binding affinities under physiological conditions comparable with the competitive binding assay at pH 6.5 (wild-type=Q58L&gt;H9Q&gt;H9A, E57A&gt;Y195A, Y196A). Growth dependence on human transferrin was only obtained with cells expressing wild-type, Q58L or H9Q FbpAs, proteins with stability constants derived from the competition assay &gt;2.0x10(18) M(-1). These results suggest that a relatively high affinity of iron binding by FbpA is required for removal of iron from transferrin and its transport across the outer membrane.
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{{ABSTRACT_PUBMED_17313366}}


==About this Structure==
==About this Structure==
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[[Category: Iron binding]]
[[Category: Iron binding]]
[[Category: Mixed beta sheet]]
[[Category: Mixed beta sheet]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May  4 10:22:52 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 17:16:59 2008''

Revision as of 14:17, 27 July 2008

File:2o6a.png

Template:STRUCTURE 2o6a

Crystal structure of the Haemophilus influenzae E57A mutant FbpA

Template:ABSTRACT PUBMED 17313366

About this Structure

2O6A is a Single protein structure of sequence from Haemophilus influenzae. Full crystallographic information is available from OCA.

Reference

High-affinity binding by the periplasmic iron-binding protein from Haemophilus influenzae is required for acquiring iron from transferrin., Khan AG, Shouldice SR, Kirby SD, Yu RH, Tari LW, Schryvers AB, Biochem J. 2007 Jun 1;404(2):217-25. PMID:17313366

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