1kzu
From Proteopedia
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INTEGRAL MEMBRANE PERIPHERAL LIGHT HARVESTING COMPLEX FROM RHODOPSEUDOMONAS ACIDOPHILA STRAIN 10050
Overview
The refined structure of the peripheral light-harvesting complex from, Rhodopseudomonas acidophila strain 10050 reveals a membrane protein with, protein-protein interactions in the trans-membrane region exclusively of a, van der Waals nature. The dominant factors in the formation of the complex, appear to be extramembranous hydrogen bonds (suggesting that each, apoprotein must achieve a fold close to its final structure in order to, oligomerize), protein-pigment and pigment-pigment interactions within the, membrane-spanning region. The pigment molecules are known to play an, important role in the formation of bacterial light-harvesters, and their, extensive mediation of structural contacts within the membrane bears this, out. Amino acid residues determining the secondary structure of the, apoproteins influence the oligomeric state of the complex. The assembly of, the pigment array is governed by the apoproteins of LH2. The particular, environment of each of the pigment molecules is, however, influenced, directly by few protein contacts. These contacts produce functional, effects that are not attributable to a single cause, e.g. the arrangement, of an overlapping cycle of chromophores not only provides energy, delocalisation and storage properties, but also has consequences for, oligomer size, pigment distortion modes and pigment chemical environment, all of which modify the precise function of the complex. The evaluation of, site energies for the pigment array requires the consideration of a number, of effects, including heterogeneous pigment distortions, charge, distributions in the local environment and mechanical interactions.
About this Structure
1KZU is a Protein complex structure of sequences from Rhodoblastus acidophilus with and as ligands. Known structural/functional Sites: , , , , , , , and . Full crystallographic information is available from OCA.
Reference
Apoprotein structure in the LH2 complex from Rhodopseudomonas acidophila strain 10050: modular assembly and protein pigment interactions., Prince SM, Papiz MZ, Freer AA, McDermott G, Hawthornthwaite-Lawless AM, Cogdell RJ, Isaacs NW, J Mol Biol. 1997 May 2;268(2):412-23. PMID:9159480
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