Padrós E, Duñach M, Sabés M. Induction of the blue form of bacteriorhodopsin by low concentrations of sodium dodecyl sulfate.
BIOCHIMICA ET BIOPHYSICA ACTA 1984;
769:1-7. [PMID:
6691969 DOI:
10.1016/0005-2736(84)90002-6]
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Abstract
The effects produced on bacteriorhodopsin by low concentrations of several detergents have been studied by absorption and fourth-derivative spectrophotometry. Sodium dodecyl sulfate induces the appearance of the blue form of bacteriorhodopsin (lambda max = 600 nm) at pH values up to 7.0 in a reversible manner. The apparent pK of the purple-to-blue transition raised with increasing concentration of SDS. Of the other detergents tested, only sodium dodecyl-N-sarcosinate showed a slight red-shift of the absorption band to 580 nm, whereas sodium taurocholate, Triton X-100 and cetyltrimethylammonium bromide did not favour the appearance of the blue form. The effect of SDS was found to be consistent with a localized conformational change that moves away the counter-ion of the protonated Schiff base.
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