1ith | pdb_00001ith

STRUCTURE DETERMINATION AND REFINEMENT OF HOMOTETRAMERIC HEMOGLOBIN FROM URECHIS CAUPO AT 2.5 ANGSTROMS RESOLUTION

spinqualitylabelsall models 1ith, resolution 2.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1ith is a 2 chain structure with sequence from Innkeeper worm. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CYN, HEM Gene: CDNA (Innkeeper worm) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [HBF1_URECA] Hemoglobin F-I appears to function in storage, rather than transport of oxygen. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed A 5 A resolution multiple isomorphous replacement solution for hemoglobin isolated from Urechis caupo revealed a previously unobserved quaternary structure for tetrameric hemoglobin [Kolatkar, Meador, Stanfield & Hackert (1988). J. Biol. Chem. 263(7), 3462-3465]. We report here the structure of Urechis hemoglobin in the cyanomet state refined to 2.5 A resolution by simulated annealing yielding R = 0.148 for reflections F greater than 3 sigma between 5.0 and 2.5 A resolution. The starting model was fitted to a map originally derived from multiple-wavelength anomalous-dispersion phases to 3 A resolution that was then subjected to cyclic twofold molecular averaging and solvent flattening. Structural analysis of the resultant model shows that the unique quaternary assemblage is possible due to several favorable interactions between subunits, including salt links, hydrophobic pockets and interactions mediated by bound water. The tetramer is stabilized by subunit-subunit interactions between the G/H turns and D helices within the crystallographic dimer, and the A/B turn regions and E helices between subunits related by a molecular twofold axis. Interestingly, each subunit has one cysteine residue (Cys21) located in the A/B turn. These twofold-related cysteinyl residues are near enough to one another to form a disulfide bridge but do not. Structure determination and refinement of homotetrameric hemoglobin from Urechis caupo at 2.5 A resolution.,Kolatkar PR, Ernst SR, Hackert ML, Ogata CM, Hendrickson WA, Merritt EA, Phizackerley RP Acta Crystallogr B. 1992 Apr 1;48 ( Pt 2):191-9. PMID:1515107 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Hemoglobin 3D structures

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