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1nxf

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{{STRUCTURE_1nxf| PDB=1nxf | SCENE= }}
{{STRUCTURE_1nxf| PDB=1nxf | SCENE= }}
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'''Ligand-linked transitions of deoxyHbI crystals exposed to CO.'''
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===Ligand-linked transitions of deoxyHbI crystals exposed to CO.===
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==Overview==
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Cooperative ligand binding in the dimeric hemoglobin (HbI) from the blood clam Scapharca inaequivalvis is mediated primarily by tertiary structural changes, but with a small quaternary rearrangement (approximately 3 degrees), based on analysis of distinct crystal forms for ligated and unligated molecules. We report here ligand transition structures in both crystal forms. Binding CO to unligated HbI crystals results in a structure that approaches, but does not attain, the full allosteric transition. In contrast, removing CO from the HbI-CO crystals results in a structure that possesses all the key low affinity attributes previously identified from analysis of HbI crystals grown in the unligated state. Subsequent binding of CO shows the reversibility of this process. The observed structural changes include the quaternary rearrangement even under the constraints of lattice interactions, demonstrating that subunit rotation is an integral component of the ligand-linked structural transition in HbI. Analysis of both crystal forms, along with data from HbI mutants, suggests that the quaternary structural change is linked to the movement of the heme group, supporting a hypothesis that the heme movement is the central event that triggers cooperative ligand binding in this hemoglobin dimer. These results show both the effects of a crystal lattice in limiting quaternary structural transitions and provide the first example of complete allosteric transitions within another crystal lattice.
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(as it appears on PubMed at http://www.pubmed.gov), where 12705827 is the PubMed ID number.
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{{ABSTRACT_PUBMED_12705827}}
==About this Structure==
==About this Structure==
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[[Category: Oxygen transport]]
[[Category: Oxygen transport]]
[[Category: Oxygen-binding]]
[[Category: Oxygen-binding]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 03:05:39 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 10:50:39 2008''

Revision as of 07:51, 29 July 2008

Image:1nxf.png

Template:STRUCTURE 1nxf

Ligand-linked transitions of deoxyHbI crystals exposed to CO.

Template:ABSTRACT PUBMED 12705827

About this Structure

1NXF is a Single protein structure of sequence from Scapharca inaequivalvis. Full crystallographic information is available from OCA.

Reference

Ligand-linked structural transitions in crystals of a cooperative dimeric hemoglobin., Knapp JE, Royer WE Jr, Biochemistry. 2003 Apr 29;42(16):4640-7. PMID:12705827

Page seeded by OCA on Tue Jul 29 10:50:39 2008

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