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NMR studies of fluorinated visual pigment analogs

Autor: Marlene Denny, Dennis Mead, Alfred E. Asato, J.P. Zingoni, Leticia U. Colmenares, Robert S. H. Liu

Publikováno v: Biochemical and Biophysical Research Communications. 179:1337-1343

Summary The 19 F-nmr chemical shift data of isomeric pigments (11-cis and 9-cis) of four vinyl fluororhodopsins and two trifluororhodopsins have been recorded. When compared with model protonated Schiff bases, a set of F-nmr opsin shift parameter (FO

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f1071c702ccf11faf18018fefada0bd9
https://doi.org/10.1016/0006-291x(91)91720-w

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Comparative study on the chromophore binding sites of rod and red-sensitive cone visual pigments by use of synthetic retinal isomers and analogs

Autor: Toshiyuki Okano, Yoshinori Shichida, Achla Trehan, Yoshitaka Fukada, Marlene Denny, Alfred E. Asato, Dennis Mead, Robert S. H. Liu, Toshiyuk Yoshizawa

Publikováno v: Biochemistry. 29:3133-3140

A comparative study on the chromophore (retinal) binding sites of the opsin (R-photopsin) from chicken red-sensitive cone visual pigment (iodopsin) and that scotopsin) from bovine rod pigment (rhodopsin) was made by the aid of geometric isomers of re

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fb61202540cf69aec6c43599dd77b9e2
https://doi.org/10.1021/bi00464a033

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Analyzing the red-shift characteristics of azulenic, naphthyl, other ring-fused and retinyl pigment analogs of bacteriorhodopsin

Autor: Erik Krogh, Leticia U. Colmenares, Dennis Mead, Darren Wong, J.R. Thiel, Jeannette Ellis, Robert S. H. Liu, Alfred E. Asato, Xiaoyuan Li

Publikováno v: Photochemistry and photobiology. 58(5)

Prompted by the near infrared-absorbing properties of some of the azulenic bacteriorhodopsin (bR) analogs, we have analyzed their absorption characteristics along with 11 new related ring-fused analogs and the corresponding Schiff bases (SB) and prot

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ad07ecb1535fc34c1c39280854ac00f7
https://pubmed.ncbi.nlm.nih.gov/8284326

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14-Fluorobacteriorhodopsin and other fluorinated and 14-substituted analogues. An extra, unusually red-shifted pigment formed during dark adaptation

Autor: Robert S. H. Liu, N. Sekiya, Dennis Mead, Thomas G. Ebrey, Koji Nakanishi, M. E. Tierno, Alfred E. Asato, Kazuo Yoshihara, Rajni Govindjee, C. W. Chang

Publikováno v: Biochemistry. 29(25)

Five vinyl-substituted fluororetinal analogues (8-F, 10-F, 12-F, 14-F, and 13,14-F2) were found to give bacteriorhodopsin analogues with properties similar to those of the parent system. Of these, only 14-fluororetinal was found to give an extra red-

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::706e5a9c4297eee380a78bc78b944df8
https://pubmed.ncbi.nlm.nih.gov/2383566

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Fluorinated Retinoids via Crossed Aldol Condensation of 1,1,1-Trifluoroacetone

Autor: Robert S. H. Liu, Rhonda Loh, Alfred E. Asato, Dennis Mead

Publikováno v: Tetrahedron Letters. 26:2873-2876

Piperidine-acetic acid catalysed crossed aldol condensation of 1,1,1-trifluoroacetone with aryl or α,β-unsaturated aldehydes was found to be a useful method for the preparation of unsaturated trifluoromethyl ketones. Chain extension of these ketone

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::98419592a40de1518c9aa7def946e753
https://doi.org/10.1016/s0040-4039(00)98859-2

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