Antenna ring around trimeric Photosystem I in chlorophyll b containing cyanobacterium Prochlorothrix hollandica
Language English Country Netherlands Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
15949978
DOI
10.1016/j.bbabio.2005.02.005
PII: S0005-2728(05)00081-2
Knihovny.cz E-resources
- MeSH
- Centrifugation, Density Gradient MeSH
- Microscopy, Electron MeSH
- Photosystem I Protein Complex ultrastructure MeSH
- Protein Structure, Quaternary MeSH
- Prochlorothrix ultrastructure MeSH
- Light-Harvesting Protein Complexes chemistry ultrastructure MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Photosystem I Protein Complex MeSH
- Light-Harvesting Protein Complexes MeSH
Prochlorothrix hollandica is one of the three known species of an unusual clade of cyanobacteria (formerly called "prochlorophytes") that contain chlorophyll a and b molecules bound to intrinsic light-harvesting antenna proteins. Here, we report the structural characterization of supramolecular complex consisting of Photosystem I (PSI) associated with the chlorophyll a/b-binding Pcb proteins. Electron microscopy and single particle image analysis of negatively stained preparations revealed that the Pcb-PSI supercomplex consists of a central trimeric PSI surrounded by a ring of 18 Pcb subunits. We conclude that the formation of the Pcb ring around trimeric PSI represents a mechanism for increasing the light-harvesting efficiency in chlorophyll b-containing cyanobacteria.
References provided by Crossref.org
Structure of PSI, PSII and antennae complexes from yellow-green alga Xanthonema debile
