Fluorescent triplet probes for measuring the rotational diffusion of membrane proteins.
作者信息
Johnson P, Garland P B
出版信息
Biochem J. 1982 Apr 1;203(1):313-21. doi: 10.1042/bj2030313.
Abstract
We have previously described a method for measuring the rotational diffusion of membrane proteins by using fluorescent triplet probes [Johnson & Garland (1981) FEBS Lett. 135, 252-256]. We now describe the criteria by which the suitability of such probes may be judged. In general, the greatest sensitivity is achievable with probes where the ratio of the quantum yields for prompt fluorescene (phi f) and triplet formation (phi t) are high, as with Rhodamine (phi f/phi t congruent to 10(3)). However, considerations of heat generation at the sample membrane, of time resolution of fast rotations and of irreversible bleaching of the fluorescent probe also apply. The immediate environment of a probe molecule at a membrane protein must also be important in determining the performance of a given probe. Nevertheless, we describe guidelines for evaluating the likely usefulness of fluorescent triplet probes in measurements of membrane protein rotation.
摘要
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