Linked Life Data

39590

Source:http://linkedlifedata.com/resource/pubmed/id/39590

Statements in which the resource exists.
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pubmed-article:39590pubmed:abstractTextPurple membranes (PM) from Halobacterium halobium were incorporated into 7.5% polyacrylamide gels to prevent aggregation which occurs in suspensions at low pH. At pH 7.0, the circular dichroism (CD) spectra and visible absorption spectra of light- and dark-adapted bacteriorhodopsin (bR558, respectively) and the flash photolysis cycle of bR568 in gels were essentially the same as those in PM suspensions. Titration of the gels with hydrochloric acid showed the transition to a form absorbing at 605 nm (bR605 acid) with pK = 2.9 and to a second form absorbing at 565 nm (bR565 acid) with pK = 0.5. Isosbestic points were seen for each transition in both light- and dark-adapted gels. In addition, a third isosbestic point was evident between pH 3.5 and 7. Visible CD spectra of bR568, bR605 acid, and bR565 acid all showed the bilobed pattern typical of bR568 in suspensions of PM. Flash kinetic spectrophotometry (with 40-microseconds time resolution) of bR605 acid and bR565 acid showed transient absorbance changes with at least one transiently blue-shifted form for each and an early red-shifted intermediate for bR565 acid. Chromophore extraction from membrane suspensions yielded all-trans-retinal for bR565 acid and a mixture of 13-cis and trans isomers for bR605 acid.lld:pubmed
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pubmed-article:39590pubmed:articleTitleEffect of acid pH on the absorption spectra and photoreactions of bacteriorhodopsin.lld:pubmed
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