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Channelrhodopsin-1: A Light-Gated Proton Channel in Green Algae
Abstract
Phototaxis and photophobic responses of green algae are mediated by rhodopsins with microbial-type chromophores. We report a complementary DNA sequence in the green alga Chlamydomonas reinhardtii that encodes a microbial opsin-related protein, which we term Channelopsin-1. The hydrophobic core region of the protein shows homology to the light-activated proton pump bacteriorhodopsin. Expression of Channelopsin-1, or only the hydrophobic core, in Xenopus laevis oocytes in the presence of all- trans retinal produces a light-gated conductance that shows characteristics of a channel selectively permeable for protons. We suggest that Channelrhodopsins are involved in phototaxis of green algae.
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Metadata
- Authors
- Nagel, G., Ollig, D., Fuhrmann, M., Kateriya, S., Musti, A. M., Bamberg, E., & Hegemann, P.
- Venue
- Science
- Published
- 2002-06-28
- Volume
- 296
- Issue
- 5577
- Pages
- 2395-2398
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2058488568
- Cited by
- 1,159
- References
- 0
- FWCI
- 3.75
- Type
- journal article
- Language
- en
- Open access
- closed
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