Membrane structure - download pdf or read online

By J B Finean; R H Michell

ISBN-10: 0444803033

ISBN-13: 9780444803030

ISBN-10: 0444803041

ISBN-13: 9780444803047

ISBN-10: 0444803459

ISBN-13: 9780444803450

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48, 49, 67, 75). Rat liver cytochrome P450 rotates slowly with a relaxation time (approx. tDro t ) of 3·10 -3 S at 2JOC. The interaction of cytochrome P450 with its reductase appears to be mediated by lateral diffusion [36]. (ii) Use of extrinsic chromophores The approach to measuring rotation of molecules with intrinsic chromophores can, in principle, be generalized by using extrinsic labels. In practice, considerable effort was required to develop a label which was both sufficiently long-lived to allow measurement of protein rotation in lipids and generally reactive with proteins.

Fluorescence polarization methods are quite successful in measuring rotation of labeled proteins in aqueous solutions where the rotational relaxation times (approx. tDrot) are of the order of 10 -8 s, a time about equal to the lifetime of the excited state of the label, 1-100 X 10 -9 s. If solvent viscosity is increased around 100-fold, then near-complete decay of the fluorescence will occur before significant molecular rotation takes place and no depolarization will be detected. In fact, this result (no depolarization) was obtained by Wahl et al.

12, I-57. , Furthmayr, H. and Tomita, M. (1976) Annu. Rev. Biochem. 45, 667-698. L. (1974) J. Cel1. BioI. 62, 1- 19. L. (1978) J. Supramol. Struct. 8, 311- 324. M. F. (1977) Biochem. Biophys. Res. Commun. 77,1203-1209. W. T. (1977) Biochem. Biophys. Res. Commun. 77, 1210-1216. 56 Schulman, H. and Greengard, P. (1978) Proc. Natl. Acad. Sci. USA 75, 5432-5436. 57 Coleman, R. (1980) in N. Belton and e. ), Problems of Transport and Metabolic Disease, MTP Press, Lancaster, pp. 35-38. , Fischman, D. L.

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Membrane structure by J B Finean; R H Michell


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