1moh

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[[Image:1moh.gif|left|200px]]
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{{Structure
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|LIGAND= <scene name='pdbligand=H2S:HYDROSULFURIC+ACID'>H2S</scene>, <scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1moh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1moh OCA], [http://www.ebi.ac.uk/pdbsum/1moh PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1moh RCSB]</span>
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'''FERRIC MONOMERIC HEMOGLOBIN I (HB I)'''
'''FERRIC MONOMERIC HEMOGLOBIN I (HB I)'''
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[[Category: Rizzi, M.]]
[[Category: Rizzi, M.]]
[[Category: Wittenberg, J B.]]
[[Category: Wittenberg, J B.]]
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[[Category: hemoglobin (ferric)]]
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[[Category: Monomeric]]
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[[Category: monomeric]]
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[[Category: Sulfide transport]]
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[[Category: sulfide transport]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 01:31:23 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 22:18:52 2008''
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Revision as of 22:31, 2 May 2008

Image:1moh.gif

Template:STRUCTURE 1moh

FERRIC MONOMERIC HEMOGLOBIN I (HB I)


Overview

The X-ray crystal structure of the sulfide derivative of ferric Lucina pectinata hemoglobin component I (HbI) has been determined at 1.9 A resolution (R-factor 0.186). The heme pocket structural organization of HbI is in keeping with its ligand binding properties. The fast sulfide association rate constant can be related to the presence of Gln(64)E7, as the heme distal residue, together with the protein structural properties in the CD-E distal region. Moreover, the very high sulfide affinity for HbI is reflected by the exceptionally slow ligand dissociation rate. The stabilization of the heme-bound sulfide molecule is achieved through hydrogen bonding to Gln(64)E7, as well as by finely tuned aromatic-electrostatic interactions with the clustered residues Phe(29)B10, Phe(43)CD1 and Phe(68)E11. Such a peculiar arrangement of phenylalanyl residues at the distal ligand binding site has not been observed before in the globin family, and is unique to HbI, a protein functionally devoted to sulfide transport.

About this Structure

1MOH is a Single protein structure of sequence from Lucina pectinata. Full crystallographic information is available from OCA.

Reference

Structural bases for sulfide recognition in Lucina pectinata hemoglobin I., Rizzi M, Wittenberg JB, Coda A, Ascenzi P, Bolognesi M, J Mol Biol. 1996 Apr 26;258(1):1-5. PMID:8613980 Page seeded by OCA on Sat May 3 01:31:23 2008

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