3j32 | pdb_00003j32

An asymmetric unit map from electron cryo-microscopy of Haliotis diversicolor molluscan hemocyanin isoform 1 (HdH1)

Loading... Status: waiting for Mol* initialization Structural highlights 3j32 is a 2 chain structure with sequence from Haliotis diversicolor. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Hemocyanins are responsible for transporting O2 in the arthropod and molluscan hemolymph. Haliotis diversicolor molluscan hemocyanin isoform 1 (HdH1) is an 8 MDa oligomer. Each subunit is made up of eight functional units (FUs). Each FU contains two Cu ions, which can reversibly bind an oxygen molecule. Here, we report a 4.5 A cryo-EM structure of HdH1. The structure clearly shows ten asymmetric units arranged with D5 symmetry. Each asymmetric unit contains two structurally distinct but chemically identical subunits. The map is sufficiently resolved to trace the entire subunit Calpha backbone and to visualize densities corresponding to some large side chains, Cu ion pairs, and interaction networks of adjacent subunits. A FU topology path intertwining between the two subunits of the asymmetric unit is unambiguously determined. Our observations suggest a structural mechanism for the stability of the entire hemocyanin didecamer and 20 "communication clusters" across asymmetric units responsible for its allosteric property upon oxygen binding. Cryo-EM Structure of a Molluscan Hemocyanin Suggests Its Allosteric Mechanism.,Zhang Q, Dai X, Cong Y, Zhang J, Chen DH, Dougherty MT, Wang J, Ludtke SJ, Schmid MF, Chiu W Structure. 2013 Mar 26. pii: S0969-2126(13)00075-0. doi:, 10.1016/j.str.2013.02.018. PMID:23541894 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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