X-Ray Photoelectron Spectroscopy (XPS) of Bacteriorhodopsin Analogues Synthesized from Fluorophenyl Retinals

Masae Takahashi, Takashi Takahashi, Fumio Tokunaga, Takasi Sagawa

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The two external point-charge (TEPC) model for bacteriorhodopsin (bR) has been examined by X-ray photoelectron spectroscopy (XPS) and CNDO/S molecular orbital calculations. A main concern was given to a point charge near the β-ionone ring. XPS measurements were carried out on fluorophenyl retinal(F-ret)and their derivatives (SchifF base, protonated Schiff base and bacteriorhodopsin analogues (F-bR)), paying close attention to the chemical shift of the F h core level. No meaningful differences were observed among these species although numerical calculations on an assumption of the TEPC model have predicted the chemical shift of about 3 eV between F-ret and F-bR. This fact has arisen a serious question to the validity of the TEPC model. The same conclusion has been reached by the present study of absorption maxima of F-ret and their derivatives.

Original languageEnglish
Pages (from-to)1557-1564
Number of pages8
Journaljournal of the physical society of japan
Volume53
Issue number4
DOIs
Publication statusPublished - 1984 Jan 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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