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| Content Provider | Springer Nature Link |
|---|---|
| Author | Jaschke, Paul R. LeBlanc, Heidi N. Lang, Andrew S. Beatty, J. Thomas |
| Copyright Year | 2007 |
| Abstract | Rhodobacter capsulatus contains lhaA and pucC genes that have been implicated in light-harvesting complex 1 and 2 (LH1 and LH2) assembly. The proteins encoded by these genes, and homologues in other photosynthetic organisms, have been classified as the bacteriochlorophyll delivery (BCD) family of the major facilitator superfamily. A new BCD family phylogenetic tree reveals that several PucC, LhaA and Orf428-related sequences each form separate clusters, while plant and cyanobacterial homologues cluster more distantly. The PucC protein is encoded in the pucBACDE superoperon which also codes for LH2 α (PucA) and β (PucB) proteins. PucC was previously shown to be necessary for formation of LH2. This article gives evidence indicating that PucC has a shepherding activity that keeps the homologous α and β proteins of LH1 and LH2 apart, allowing LH1 to assemble properly. This shepherding function was indicated by a 62% reduction in LH1 levels in ΔLHII strains carrying plasmids encoding pucBA along with a C-terminally truncated pucC gene. More severe reductions in LH1 were seen when the truncated pucC gene was co-expressed in the presence of C-terminal PucC::PhoA fusion proteins. It appears that interaction between truncated PucC::PhoA fusion proteins and the truncated PucC protein disrupts LH1 assembly, pointing towards a PucC dimeric or multimeric functional unit. |
| Starting Page | 279 |
| Ending Page | 284 |
| Page Count | 6 |
| File Format | |
| ISSN | 01668595 |
| Journal | Photosynthesis Research |
| Volume Number | 95 |
| Issue Number | 2-3 |
| e-ISSN | 15735079 |
| Language | English |
| Publisher | Springer Netherlands |
| Publisher Date | 2007-10-09 |
| Publisher Place | Dordrecht |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Photosynthesis Purple bacteria Light-harvesting LH1 LH2 Rhodobacter PucC LhaA Bacteriochlorophyll delivery homologues Complex-specific assembly factors Plant Physiology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Plant Science Medicine Biochemistry |
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