Bacterial antenna complex
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| Antenna complex alpha/beta subunit | ||
|---|---|---|
| Identifiers | ||
| Symbol | LHC | |
| Pfam | PF00556 | |
| InterPro | IPR000066 | |
| PROSITE | PDOC00748 | |
| SCOP | 1lgh | |
| OPM family | 1 | |
| OPM protein | 1lgh | |
| Available PDB structures:
1lghK:11-45 1nkzD:5-41 1kzuB:5-41 1ijdF:6-42 1nw0A:1-42 1xrdA:1-42 |
||
Bacterial antenna complex proteins are main components light-harvesting complexes in photosynthetic bacteria. [1]
In photosynthetic bacteria the antenna complexes function as light-harvesting systems that absorb light radiation and transfer the excitation energy to the reaction centres. The antenna complexes are generally composed of two types of polypeptides (alpha and beta chains); two or three types of bacteriochlorophyll (BChl) molecules and some carotenoids[2][3]. Both the alpha and the beta chains of antenna complexes are small proteins of 42 to 68 residues which share a three-domain organization. They are composed of a N-terminal hydrophilic cytoplasmic domain followed by a transmembrane region and a C-terminal hydrophilic periplasmic domain. In the transmembrane region of both chains there is a conserved histidine which is most probably involved in the binding of the magnesium atom of a bacteriochlorophyll group. The beta chains contain an additional conserved histidine which is located at the C-terminal extremity of the cytoplasmic domain and which is also thought to be involved in bacteriochlorophyll-binding.
[edit] Subfamilies
[edit] References
- ^ The crystal structure of the light-harvesting complex II (B800-850) from Rhodospirillum molischianum. Koepke J, Hu X, Muenke C, Schulten K, Michel H; Structure 1996;4:581-597. PubMed
- ^ Wagner-Huber R, Brunisholz RA, Bissig I, Frank G, Suter F, Zuber H (1992). "The primary structure of the antenna polypeptides of Ectothiorhodospira halochloris and Ectothiorhodospira halophila. Four core-type antenna polypeptides in E. halochloris and E. halophila". Eur. J. Biochem. 205 (3): 917–925. doi:. PMID 1577009.
- ^ Brunisholz RA, Zuber H (1992). "Structure, function and organization of antenna polypeptides and antenna complexes from the three families of Rhodospirillaneae". J. Photochem. Photobiol. B 15 (1): 113–140. doi:. PMID 1460542.
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