PMID: 3768342Sep 9, 1986Paper

Interaction of tubulin with octyl glucoside and deoxycholate. 1. Binding and hydrodynamic studies

Biochemistry
J M Andreu, J A Muñoz

Abstract

Tubulin purified from calf brain cytoplasm, normally a compact water-soluble dimer, is able to interact with the mild detergents octyl glucoside (a minimum of 60 detergent molecules) and deoxycholate (95 +/- 8 molecules). Binding is cooperative and approaches saturation below the critical micelle concentration of the amphiphiles. Binding is accompanied by a quenching of the intrinsic protein fluorescence, but no spectral shape changes indicating denaturation such as in the case of sodium dodecyl sulfate are observed. Glycerol, which is known to be preferentially excluded from the tubulin domain and to favor the folded and associated forms of this protein, inhibits the binding of the mild detergents. Octyl glucoside induces a rapidly equilibrating tubulin self-association reaction characterized by a bimodal sedimentation velocity profile with boundaries at approximately 5 and 12 S. Full dissociation of this detergent restores the normal sedimentation behavior to 90% of the protein. Binding of deoxycholate slows the sedimentation velocity of tubulin from s(0)20,w = 5.6 +/- 0.2 S to s(0)20,w = 4.8 +/- 0.3 S. Measurements of the molecular weight of the tubulin-deoxycholate complex indicate an increase from 100,000 to 143,000 +/- 5,...Continue Reading

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