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PMID: 9843979 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S.

Tracking molecular evolution of photosynthesis by characterization of a major photosynthesis gene cluster from Heliobacillus mobilis.

Proceedings of the National Academy of Sciences of the United States of America ·Vol. 95 ·No. 25 ·1998-12-08 ·Pages 14851-6

Xiong J, Inoue K, Bauer CE

Abstract

A DNA sequence has been obtained for a 35.6-kb genomic segment from Heliobacillus mobilis that contains a major cluster of photosynthesis genes. A total of 30 ORFs were identified, 20 of which encode enzymes for bacteriochlorophyll and carotenoid biosynthesis, reaction-center (RC) apoprotein, and cytochromes for cyclic electron transport. Donor side electron-transfer components to the RC include a putative RC-associated cytochrome c553 and a unique four-large-subunit cytochrome bc complex consisting of Rieske Fe-S protein (encoded by petC), cytochrome b6 (petB), subunit IV (petD), and a diheme cytochrome c (petX). Phylogenetic analysis of various photosynthesis gene products indicates a consistent grouping of oxygenic lineages that are distinct and descendent from anoxygenic lineages. In addition, H. mobilis was placed as the closest relative to cyanobacteria, which form a monophyletic origin to chloroplast-based photosynthetic lineages. The consensus of the photosynthesis gene trees also indicates that purple bacteria are the earliest emerging photosynthetic lineage. Our analysis also indicates that an ancient gene-duplication event giving rise to the paralogous bchI and bchD genes predates the divergence of all photosynthetic groups. In addition, our analysis of gene duplication of the photosystem I and photosystem II core polypeptides supports a "heterologous fusion model" for the origin and evolution of oxygenic photosynthesis.

MeSH Terms
Bacteria/genetics Evolution, Molecular Molecular Sequence Data Multigene Family Photosynthesis/genetics
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Xiong J
Department of Biology, Indiana University, Bloomington, IN 47405, USA.
Inoue K
Bauer C E
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Article Info
Journal
Proceedings of the National Academy of Sciences of the United States of America
Abbr.
Proc Natl Acad Sci U S A
ISSN
0027-8424
DOI
10.1073/pnas.95.25.14851
Published
1998-12-08
Pages
14851-6
Language
English
Region
United States
NLM ID
7505876
PMCID
PMC24539
Subset
IM
Grants
NIGMS NIH HHS · R01 GM040941 · United States
NIGMS NIH HHS · R01 GM053940 · United States
NIGMS NIH HHS · GM00618 · United States
NIGMS NIH HHS · GM53940 · United States
Databases
GENBANK
AF080002
External Links
PubMed source DOI: 10.1073/pnas.95.25.14851 PMC Full Text View journal details
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