The Structure of Sickling Deer Type III Hemoglobin by Molecular Replacement

Document Type


Subject Area(s)

chemistry, natural sciences


A combination of oriented single-crystal electron microscopy and protein crystallography has been used to show that crystalline sickling deer hemoglobin molecules from Odocoileusvirginianus[oxy fl-chain variant- type III, Hb(DIII)] pack to form a distorted honeycomb (hexagonal) structure with open solvent channels. This network of molecules, consisting of out-of-register anti-parallel strands (fibrils), bears an unmistakable relation to the hemoglobin fibers and aggregates found in human sickled cells. The crystal structure was solved by means of the rotation and translation functions, with data to 3-5/k resolution giving the current residual of 0.430. Oxy- or cyanomet-Hb(DIII) crystallizes in space group C2 with a = 163.49 (3), b = 70.83 (2), c= 65.95 (2) A,fl = 94.15 (1)° and Z = 4.