Taxonomic distribution and origins of the extended LHC (light-harvesting complex) antenna protein superfamily

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• dc.contributor.author Engelken, Johannesca
• dc.contributor.author Brinkmann, Hennerca
• dc.contributor.author Adamska, Iwonaca
• dc.date.accessioned 2014-12-22T13:00:18Z
• dc.date.available 2014-12-22T13:00:18Z
• dc.date.issued 2010ca
• dc.description.abstract Background: The extended light-harvesting complex (LHC) protein superfamily is a centerpiece of eukaryotic photosynthesis, comprising the LHC family and several families involved in photoprotection, like the LHC-like and the photosystem II subunit S (PSBS). The evolution of this complex superfamily has long remained elusive, partially due to previously missing families./nResults: In this study we present a meticulous search for LHC-like sequences in public genome and expressed sequence tag databases covering twelve representative photosynthetic eukaryotes from the three primary lineages of plants (Plantae): glaucophytes, red algae and green plants (Viridiplantae). By introducing a coherent classification of the different protein families based on both, hidden Markov model analyses and structural predictions, numerous new LHC-like sequences were identified and several new families were described, including the red lineage chlorophyll a/b-binding-like protein (RedCAP) family from red algae and diatoms. The test of alternative topologies of sequences of the highly conserved chlorophyll-binding core structure of LHC and PSBS proteins significantly supports the independent origins of LHC and PSBS families via two unrelated internal gene duplication events. This result was confirmed by the application of cluster likelihood mapping./nConclusions: The independent evolution of LHC and PSBS families is supported by strong phylogenetic evidence. In addition, a possible origin of LHC and PSBS families from different homologous members of the stress-enhanced protein subfamily, a diverse and anciently paralogous group of two-helix proteins, seems likely. The new hypothesis for the evolution of the extended LHC protein superfamily proposed here is in agreement with the character evolution analysis that incorporates the distribution of families and subfamilies across taxonomic lineages. Intriguingly, stress-enhanced proteins, which are universally found in the genomes of green plants, red algae, glaucophytes and in diatoms with complex plastids, could represent an important and previously missing link in the evolution of the extended LHC protein superfamily.
• dc.description.sponsorship This work was supported by grants from the Deutsche Forschungsgemeinschaft (AD-92/7-2) and the Konstanz University to IA, JE was supported by a grant (I/82 750) from the Volkswagenstiftung, "Förderungsinitiative Evolutionsbiologie".
• dc.format.mimetype application/pdfca
• dc.identifier.citation Engelken J, Brinkmann H, Adamska I. Taxonomic distribution and origins of the extended LHC (light-harvesting complex) antenna protein superfamily. BMC Evol Biol. 2010 Jul;10:233. DOI: 10.1186/1471-2148-10-233ca
• dc.identifier.doi http://dx.doi.org/10.1186/1471-2148-10-233
• dc.identifier.issn 1471-2148ca
• dc.identifier.uri http://hdl.handle.net/10230/23027
• dc.language.iso engca
• dc.publisher BioMed Centralca
• dc.relation.ispartof BMC Evolutionary Biology. 2010 Jul;10:233
• dc.rights © 2010 Engelken et al; licensee BioMed Central Ltd. /nThis is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.ca
• dc.rights.accessRights info:eu-repo/semantics/openAccessca
• dc.rights.uri http://creativecommons.org/licenses/by/2.0
• dc.subject.other Fotosíntesi
• dc.subject.other Clorofil·la
• dc.subject.other Cromatòfors
• dc.subject.other Gens
• dc.title Taxonomic distribution and origins of the extended LHC (light-harvesting complex) antenna protein superfamilyca
• dc.type info:eu-repo/semantics/articleca
• dc.type.version info:eu-repo/semantics/publishedVersionca