1ijd
From Proteopedia
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'''Crystallographic Structure of the LH3 Complex from Rhodopseudomonas acidophila strain 7050''' | '''Crystallographic Structure of the LH3 Complex from Rhodopseudomonas acidophila strain 7050''' | ||
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[[Category: McLuskey, K.]] | [[Category: McLuskey, K.]] | ||
[[Category: Prince, S M.]] | [[Category: Prince, S M.]] | ||
| - | [[Category: | + | [[Category: Alpha-helix apoprotein]] |
| - | [[Category: | + | [[Category: Intergral membrane protein]] |
| - | [[Category: | + | [[Category: Light harvesting]] |
| - | [[Category: | + | [[Category: Pigment-protein complex]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 20:03:48 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 17:03, 2 May 2008
Crystallographic Structure of the LH3 Complex from Rhodopseudomonas acidophila strain 7050
Overview
The B800-820, or LH3, complex is a spectroscopic variant of the B800-850 LH2 peripheral light-harvesting complex. LH3 is synthesized by some species and strains of purple bacteria when growing under what are generally classed as "stressed" conditions, such as low intensity illumination and/or low temperature (<30 degrees C). The apoproteins in these complexes modify the absorption properties of the chromophores to ensure that the photosynthetic process is highly efficient. The crystal structure of the B800-820 light-harvesting complex, an integral membrane pigment-protein complex, from the purple bacteria Rhodopseudomonas (Rps.) acidophila strain 7050 has been determined to a resolution of 3.0 A by molecular replacement. The overall structure of the LH3 complex is analogous to that of the LH2 complex from Rps. acidophila strain 10050. LH3 has a nonameric quaternary structure where two concentric cylinders of alpha-helices enclose the pigment molecules bacteriochlorophyll a and carotenoid. The observed spectroscopic differences between LH2 and LH3 can be attributed to differences in the primary structure of the apoproteins. There are changes in hydrogen bonding patterns between the coupled Bchla molecules and the protein that have an effect on the conformation of the C3-acetyl groups of the B820 molecules. The structure of LH3 shows the important role that the protein plays in modulating the characteristics of the light-harvesting system and indicates the mechanisms by which the absorption properties of the complex are altered to produce a more efficient light-harvesting component.
About this Structure
1IJD is a Protein complex structure of sequences from Rhodoblastus acidophilus. Full crystallographic information is available from OCA.
Reference
The crystallographic structure of the B800-820 LH3 light-harvesting complex from the purple bacteria Rhodopseudomonas acidophila strain 7050., McLuskey K, Prince SM, Cogdell RJ, Isaacs NW, Biochemistry. 2001 Jul 31;40(30):8783-9. PMID:11467938 Page seeded by OCA on Fri May 2 20:03:48 2008
