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    Crystal structure of the hemoglobin dodecamer from Lumbricus erythrocruorin: allosteric core of giant annelid respiratory complexes

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    Authors
    Strand, Kristen
    Knapp, James E.
    Bhyravbhatla, Balaji
    Royer, William E.
    UMass Chan Affiliations
    Department of Biochemistry and Molecular Pharmacology
    Graduate School of Biomedical Sciences
    Document Type
    Journal Article
    Publication Date
    2004-10-27
    Keywords
    Allosteric Site; Amino Acid Sequence; Animals; Crystallography, X-Ray; Dimerization; Electrostatics; Heme; Hemoglobins; Models, Molecular; Molecular Sequence Data; Oligochaeta; Protein Structure, Quaternary; Sequence Homology, Amino Acid
    Life Sciences
    Medicine and Health Sciences
    
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    Link to Full Text
    http://dx.doi.org/10.1016/j.jmb.2004.08.094
    Abstract
    Erythrocruorins are highly cooperative giant extracellular respiratory complexes found in annelids, where they serve the same function as red blood cells. Our previous 5.5A resolution crystal structure of Lumbricus terrestris erythrocruorin revealed a hierarchical organization of 144 oxygen-binding hemoglobin chains that are assembled into 12 dodecamers arranged at the periphery of the complex around a central scaffold formed by 36 non-hemoglobin subunits. We present here the 2.6A resolution crystal structure of the Lumbricus hemoglobin dodecameric subassembly, which provides the first atomic models of the erythrocruorin allosteric core. The hemoglobin dodecamer has a molecular 3-fold axis of symmetry that relates three heterotetramers, each of which is composed of two tightly associated heterodimers. The structure reveals details of the interfaces, including key side-chain interactions likely to contribute to ligand-linked allosteric transitions, and shows the crowded nature of the ligand-binding pockets. Comparison of the Lumbricus dimeric assemblies with similar ones from mollusks and echinoderms suggests plausible pH-dependent quaternary transitions that may occur in response to proton binding and ligand release. Thus, these results provide the first step towards elucidating the structural basis for the strong allosteric properties of Lumbricus erythrocruorin.
    Source
    J Mol Biol. 2004 Nov 12;344(1):119-34. Link to article on publisher's site
    DOI
    10.1016/j.jmb.2004.08.094
    Permanent Link to this Item
    http://hdl.handle.net/20.500.14038/32649
    PubMed ID
    15504406
    Related Resources
    Link to Article in PubMed
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.jmb.2004.08.094
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