5xqu

Crystal structure of Notched-fin eelpout type III antifreeze protein A20I mutant (NFE6, AFP), P212121 form

spinqualitylabelsall models 5xqu, resolution 1.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5xqu is a 1 chain structure with sequence from Enchelyopus elongatus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [Q53UJ4_9TELE] Lowers the blood freezing point. Contributes to protect fish blood from freezing at subzero sea water temperatures. Binds to nascent ice crystals and prevents further growth.[RuleBase:RU362061] Publication Abstract from PubMed Polypentagonal water networks were recently observed in a protein capable of binding to ice crystals, or ice-binding protein (IBP). To examine such water networks and clarify their role in ice-binding, we determined X-ray crystal structures of a 65-residue defective isoform of a Zoarcidae-derived IBP (wild type, WT) and its five single mutants (A20L, A20G, A20T, A20V, and A20I). Polypentagonal water networks composed of approximately 50 semiclathrate waters were observed solely on the strongest A20I mutant, which appeared to include a tetrahedral water cluster exhibiting a perfect position match to the [Formula: see text] first prism plane of a single ice crystal. Inclusion of another symmetrical water cluster in the polypentagonal network showed a perfect complementarity to the waters constructing the [Formula: see text] pyramidal ice plane. The order of ice-binding strength was A20L < A20G < WT < A20T < A20V < A20I, where the top three mutants capable of binding to the first prism and the pyramidal ice planes commonly contained a bifurcated gamma-CH3 group. These results suggest that a fine-tuning of the surface of Zoarcidae-derived IBP assisted by a side-chain group regulates the holding property of its polypentagonal water network, the function of which is to freeze the host protein to specific ice planes. Polypentagonal ice-like water networks emerge solely in an activity-improved variant of ice-binding protein.,Mahatabuddin S, Fukami D, Arai T, Nishimiya Y, Shimizu R, Shibazaki C, Kondo H, Adachi M, Tsuda S Proc Natl Acad Sci U S A. 2018 May 7. pii: 1800635115. doi:, 10.1073/pnas.1800635115. PMID:29735675 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Antifreeze protein 3D structures

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