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Molecular Origins and Consequences of High-800 LH2 in Roseobacter denitrificans.
- Source :
-
Biochemistry . 8/9/2011, Vol. 50 Issue 31, p6723-6729. 7p. - Publication Year :
- 2011
-
Abstract
- Roseobacter denitrificans is a marine bacterium capable of using a wide variety of different metabolic schemes and in particular is an anoxygenic aerobic photosynthetic bacterium. In the work reported here we use a deletion mutant that we have constructed to investigate the structural origin of the unusual High-800 light-harvesting complex absorption in this bacterium. We suggest that the structure is essentially unaltered when compared to the usual nonameric complexes but that a change in the environment of the C13:1 carbonyl group is responsible for the change in spectrum. We tentatively relate this change to the presence of a serine residue in the a-polypeptide. Surprisingly, the low spectral overlap between the peripheral and core light-harvesting systems appears not to compromise energy collection efficiency too severely. We suggest that this may be at the expense of maintaining a low antenna size. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00062960
- Volume :
- 50
- Issue :
- 31
- Database :
- Academic Search Index
- Journal :
- Biochemistry
- Publication Type :
- Academic Journal
- Accession number :
- 66781385
- Full Text :
- https://doi.org/10.1021/bi200538j