2qws
From Proteopedia
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| , resolution 2.50Å | |||||||
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| Sites: | |||||||
| Ligands: | , | ||||||
| Gene: | pyp (Halorhodospira halophila) | ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Neutron and X-ray structural studies of short hydrogen bonds in Photoactive Yellow Protein (PYP)
Overview
Photoactive yellow protein (PYP) from Halorhodospira halophila is a soluble 14 kDa blue-light photoreceptor. It absorbs light via its para-coumaric acid chromophore (pCA), which is covalently attached to Cys69 and is believed to be involved in the negative phototactic response of the organism to blue light. The complete structure (including H atoms) of PYP has been determined in D(2)O-soaked crystals through the application of joint X-ray (1.1 A) and neutron (2.5 A) structure refinement in combination with cross-validated maximum-likelihood simulated annealing. The resulting XN structure reveals that the phenolate O atom of pCA accepts deuterons from Glu46 O(epsilon2) and Tyr42 O(eta) in two unusually short hydrogen bonds. This arrangement is stabilized by the donation of a deuteron from Thr50 O(gamma1) to Tyr42 O(eta). However, the deuteron position between pCA and Tyr42 is only partially occupied. Thus, this atom may also interact with Thr50, possibly being disordered or fluctuating between the two bonds.
About this Structure
2QWS is a Single protein structure of sequence from Halorhodospira halophila. Full crystallographic information is available from OCA.
Reference
Neutron and X-ray structural studies of short hydrogen bonds in photoactive yellow protein (PYP)., Fisher SZ, Anderson S, Henning R, Moffat K, Langan P, Thiyagarajan P, Schultz AJ, Acta Crystallogr D Biol Crystallogr. 2007 Nov;63(Pt 11):1178-84. Epub 2007, Oct 17. PMID:18007033
Page seeded by OCA on Mon Mar 31 04:54:14 2008
