1qgw

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{{STRUCTURE_1qgw| PDB=1qgw | SCENE= }}
{{STRUCTURE_1qgw| PDB=1qgw | SCENE= }}
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'''CRYSTAL STRUCTURE OF PHYCOERYTHRIN 545 FROM THE MARINE CRYPTOPHYTE RHODOMONAS CS24'''
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===CRYSTAL STRUCTURE OF PHYCOERYTHRIN 545 FROM THE MARINE CRYPTOPHYTE RHODOMONAS CS24===
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==Overview==
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Cryptophytes are unicellular photosynthetic algae that use a lumenally located light-harvesting system, which is distinct from the phycobilisome structure found in cyanobacteria and red algae. One of the key components of this system is water-soluble phycoerythrin (PE) 545 whose expression is enhanced by low light levels. The crystal structure of the heterodimeric alpha(1)alpha(2)betabeta PE 545 from the marine cryptophyte Rhodomonas CS24 has been determined at 1.63-A resolution. Although the beta-chain structure is similar to the alpha and beta chains of other known phycobiliproteins, the overall structure of PE 545 is novel with the alpha chains forming a simple extended fold with an antiparallel beta-ribbon followed by an alpha-helix. The two doubly linked beta50/beta61 chromophores (one on each beta subunit) are in van der Waals contact, suggesting that exciton-coupling mechanisms may alter their spectral properties. Each alpha subunit carries a covalently linked 15,16-dihydrobiliverdin chromophore that is likely to be the final energy acceptor. The architecture of the heterodimer suggests that PE 545 may dock to an acceptor protein via a deep cleft and that energy may be transferred via this intermediary protein to the reaction center.
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(as it appears on PubMed at http://www.pubmed.gov), where 10430868 is the PubMed ID number.
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{{ABSTRACT_PUBMED_10430868}}
==About this Structure==
==About this Structure==
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[[Category: Phycobilin]]
[[Category: Phycobilin]]
[[Category: Phycoerythrin]]
[[Category: Phycoerythrin]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 02:49:52 2008''

Revision as of 23:49, 27 July 2008

Image:1qgw.png

Template:STRUCTURE 1qgw

CRYSTAL STRUCTURE OF PHYCOERYTHRIN 545 FROM THE MARINE CRYPTOPHYTE RHODOMONAS CS24

Template:ABSTRACT PUBMED 10430868

About this Structure

1QGW is a Protein complex structure of sequences from Rhodomonas sp.. Full crystallographic information is available from OCA.

Reference

Evolution of a light-harvesting protein by addition of new subunits and rearrangement of conserved elements: crystal structure of a cryptophyte phycoerythrin at 1.63-A resolution., Wilk KE, Harrop SJ, Jankova L, Edler D, Keenan G, Sharples F, Hiller RG, Curmi PM, Proc Natl Acad Sci U S A. 1999 Aug 3;96(16):8901-6. PMID:10430868

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