Crystals of the carboxyl-terminal functional unit from Octopus dofleini hemocyanin.
The carboxyl-terminal oxygen-binding unit of the polypeptide from Octopus dofleini hemocyanin has been crystallized in a form suitable for three-dimensional X-ray analysis. This proteolytic fragment has a molecular weight of 47 kDa and reversibly binds O2 while exhibiting a slight Bohr effect. Two types of crystals have been grown. Type I crystals, currently under analysis, belong to the orthorhombic space group P2(1)2(1)2(1) and have unit cell dimensions of 92.6 A x 167.4 A x 59.2 A. A composition of two protein molecules per asymmetric unit and 50% solvent content is consistent with a self-rotation function that identifies a non-crystallographic 2-fold axis of symmetry relating these molecules. Diffraction extending beyond 1.9 A Bragg spacings can be detected with synchrotron X-radiation.
Cuff
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Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032.
Hendrickson
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WA
Lamy
J
J
Lamy
J N
JN
Miller
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van Holde
K E
KE
D000818:Animals; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003460:Crystallization; D006433:Hemocyanins; D049831:Octopodiformes; D014961:X-Ray Diffraction
D006433:Hemocyanins