Purification and Low Temperature Spectroscopy of Gecko Visual Pigments Green and Blue

Daisuke Kojima, Hiroo Imai, Toshiyuki Okano, Yoshitaka Fukada, Frederick Crescitelli, Torn Yoshizawa, Yoshinori Shichida*

*この研究の対応する著者

研究成果: Article査読

20 被引用数 (Scopus)

抄録

We purified two kinds of visual pigments, gecko green and gecko blue, from retinas of Tokay geckos (Gekko gekko) by two steps of column chromatography, and investigated their photobleaching processes by means of low temperature spectroscopy. Absorption maxima of gecko green and blue solubilized in a mixture of 3-[(3-cholamidopropyl)dimethylammonio]-l-propanesulfonate (CHAPS) and phosphatidylcholine were 522 and 465 nm, respectively, which are close to those observed in the photoreceptor cells. Low temperature spectroscopy identified six intermediates in the photobleaching process of gecko green; batho (λmax = 569 nm), BL (λmax = 519 nm), lumi (507 nm), meta I (~486 nm), meta II (~384 nm), and meta III intermediates (~500 nm). In contrast to the high similarity in amino acid sequence between gecko green and iodopsin [Kojima, D., et al. (1992) Proc. Natl. Acad. Sci. U.S.A. 89, 6841-6845], the batho-green did not revert thermally to original gecko green but converts to the next intermediate. The photobleaching process of gecko blue was investigated by low temperature spectroscopy, and three intermediates, meta I (λmax = ~470 nm), meta II (λmax = ~370 nm) and meta III (λmax = ~475 nm), were identified. A comparative study on the thermal behavior of meta intermediates revealed that the thermal stability of meta II intermediate of both of the gecko visual pigments is lower than that of metarhodopsin II. The result supports the idea that both the gecko visual pigments are cone-type ones.

本文言語English
ページ(範囲)1096-1106
ページ数11
ジャーナルBiochemistry
34
3
DOI
出版ステータスPublished - 1995 1
外部発表はい

ASJC Scopus subject areas

  • 生化学

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