2g3h

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{{STRUCTURE_2g3h| PDB=2g3h | SCENE= }}
{{STRUCTURE_2g3h| PDB=2g3h | SCENE= }}
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'''Cyanide Binding and Heme Cavity Conformational Transitions in Drosophila melanogaster Hexa-coordinate Hemoglobin'''
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===Cyanide Binding and Heme Cavity Conformational Transitions in Drosophila melanogaster Hexa-coordinate Hemoglobin===
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==Overview==
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The reason for the presence of hemoglobin-like molecules in insects, such as Drosophila melanogaster, that live in fully aerobic environments has yet to be determined. Heme endogenous hexacoordination (where HisE7 and HisF8 axial ligands to the heme Fe atom are both provided by the protein) is a recently discovered mechanism proposed to modulate O(2) affinity in hemoglobins from different species. Previous results have shown that D. melanogaster hemoglobin 1 (product of the glob1 gene) displays heme endogenous hexacoordination in both the ferrous and ferric states. Here we present kinetic data characterizing the exogenous cyanide ligand binding process, and the three-dimensional structure (at 1.4 A resolution) of the ensuing cyano-met D. melanogaster hemoglobin. Comparison with the crystal structure of the endogenously hexacoordinated D. melanogaster hemoglobin shows that the transition to the cyano-met form is supported by conformational readjustment in the CD-D-E region of the protein, which removes HisE7 from the heme. The structural and functional features of D. melanogaster hemoglobin are examined in light of previous results achieved for human and mouse neuroglobins and for human cytoglobin, which display heme endogenous hexacoordination. The study shows that, despite the rather constant value for cyanide association rate constants for the ferric hemoproteins, different distal site conformational readjustments and/or heme sliding mechanisms are displayed by the known hexacoordinate hemoglobins as a result of exogenous ligand binding.
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==About this Structure==
==About this Structure==
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[[Category: Heme distal site structure]]
[[Category: Heme distal site structure]]
[[Category: Hexa-coordinate hemoglobin]]
[[Category: Hexa-coordinate hemoglobin]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 12:15:55 2008''

Revision as of 09:15, 29 July 2008

Image:2g3h.png

Template:STRUCTURE 2g3h

Cyanide Binding and Heme Cavity Conformational Transitions in Drosophila melanogaster Hexa-coordinate Hemoglobin

Template:ABSTRACT PUBMED 16906763

About this Structure

2G3H is a Single protein structure of sequence from Drosophila melanogaster. Full crystallographic information is available from OCA.

Reference

Cyanide binding and heme cavity conformational transitions in Drosophila melanogaster hexacoordinate hemoglobin., de Sanctis D, Ascenzi P, Bocedi A, Dewilde S, Burmester T, Hankeln T, Moens L, Bolognesi M, Biochemistry. 2006 Aug 22;45(33):10054-61. PMID:16906763

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