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| [[Image:1gu8.jpg|left|200px]] | | {{Seed}} |
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| {{STRUCTURE_1gu8| PDB=1gu8 | SCENE= }} | | {{STRUCTURE_1gu8| PDB=1gu8 | SCENE= }} |
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| '''SENSORY RHODOPSIN II'''
| | ===SENSORY RHODOPSIN II=== |
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| ==Overview==
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| Sensory rhodopsins are the primary receptors of vision in animals and phototaxis in microorganisms. Light triggers the rapid isomerization of a buried retinal chromophore, which the protein both accommodates and amplifies into the larger structural rearrangements required for signaling. We trapped an early intermediate of the photocycle of sensory rhodopsin II from Natronobacterium pharaonis (pSRII) in 3D crystals and determined its X-ray structure to 2.3 A resolution. The observed structural rearrangements were localized near the retinal chromophore, with a key water molecule becoming disordered and the retinal's beta-ionone ring undergoing a prominent movement. Comparison with the early structural rearrangements of bacteriorhodopsin illustrates how modifications in the retinal binding pocket of pSRII allow subtle differences in the early relaxation of photoisomerized retinal.
| | The line below this paragraph, {{ABSTRACT_PUBMED_11937052}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 11937052 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_11937052}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Photoreceptor]] | | [[Category: Photoreceptor]] |
| [[Category: Phototaxis]] | | [[Category: Phototaxis]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 18:00:45 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 06:05:25 2008'' |