The peripheral light-harvesting complexes from purple sulfur bacteria have different 'ring' sizes.
Identifieur interne : 000638 ( Ncbi/Curation ); précédent : 000637; suivant : 000639The peripheral light-harvesting complexes from purple sulfur bacteria have different 'ring' sizes.
Auteurs : Sami Kereïche [Pays-Bas] ; Laurent Bourinet ; Wilko Keegstra ; Ana A. Arteni ; Jean-Marc Verbavatz ; Egbert J. Boekema ; Bruno Robert ; Andrew GallSource :
- FEBS letters [ 0014-5793 ] ; 2008.
Descripteurs français
- KwdFr :
- MESH :
English descriptors
- KwdEn :
- MESH :
- chemical , chemistry : Light-Harvesting Protein Complexes.
- enzymology : Chromatiaceae.
- chemical , ultrastructure : Light-Harvesting Protein Complexes.
- Cryoelectron Microscopy, Dimerization, Models, Molecular, Particle Size, Protein Conformation.
Abstract
The integral membrane light-harvesting (LH) proteins from purple photosynthetic bacteria form circular oligomers of an elementary unit that is composed of two very hydrophobic polypeptides, termed alpha and beta. These apoprotein dimers are known to associate into closed circular arrays of 8, 9 and 16 alpha/beta-mers. We report the existence of peripheral LH proteins purified from Allochromatium vinosum with two intermediate ring sizes and postulate that one is a 13 alpha/beta-mer. This shows that LH proteins are able to form membrane rings of continuously increasing diameter from 68 to 115A. The presence of these new ring sizes warrants further study, as it will help to further validate the structure-function models of LH proteins currently found in the literature.
DOI: 10.1016/j.febslet.2008.09.050
PubMed: 18840433
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<sourceDesc><biblStruct><analytic><title xml:lang="en">The peripheral light-harvesting complexes from purple sulfur bacteria have different 'ring' sizes.</title>
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<term>Light-Harvesting Protein Complexes (chemistry)</term>
<term>Light-Harvesting Protein Complexes (ultrastructure)</term>
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<term>Particle Size</term>
<term>Protein Conformation</term>
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<term>Cryomicroscopie électronique</term>
<term>Dimérisation</term>
<term>Modèles moléculaires</term>
<term>Taille de particule</term>
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<term>Protein Conformation</term>
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<term>Conformation des protéines</term>
<term>Cryomicroscopie électronique</term>
<term>Dimérisation</term>
<term>Modèles moléculaires</term>
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<front><div type="abstract" xml:lang="en">The integral membrane light-harvesting (LH) proteins from purple photosynthetic bacteria form circular oligomers of an elementary unit that is composed of two very hydrophobic polypeptides, termed alpha and beta. These apoprotein dimers are known to associate into closed circular arrays of 8, 9 and 16 alpha/beta-mers. We report the existence of peripheral LH proteins purified from Allochromatium vinosum with two intermediate ring sizes and postulate that one is a 13 alpha/beta-mer. This shows that LH proteins are able to form membrane rings of continuously increasing diameter from 68 to 115A. The presence of these new ring sizes warrants further study, as it will help to further validate the structure-function models of LH proteins currently found in the literature.</div>
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