Comparative genomics of green sulfur bacteria

被引:8
作者
Davenport, Colin [2 ]
Ussery, David W. [3 ]
Tuemmler, Burkhard [1 ,2 ]
机构
[1] Hannover Med Sch, Klin Forschergrp, OE 6710, D-30625 Hannover, Germany
[2] Hannover Med Sch, Klin Forschergrp, Klin Padiatr Pneumol & Neonatol, OE 6711, D-30625 Hannover, Germany
[3] Tech Univ Denmark, Ctr Biol Sequence Anal, DK-2800 Lyngby, Denmark
关键词
Comparative genomics; Chlorobaculum; Chlorobium; Genome atlas; Oligonucleotide usage; MATTHEWS-OLSON PROTEIN; 16S RIBOSOMAL-RNA; CHLOROBIUM-TEPIDUM; EVOLUTIONARY IMPLICATIONS; MICROBIAL GENOMES; ARCHAEAL GENOMES; USAGE PATTERNS; GENE-SEQUENCES; HOT-SPRINGS; PROKARYOTES;
D O I
10.1007/s11120-009-9515-2
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Eleven completely sequenced Chlorobi genomes were compared in oligonucleotide usage, gene contents, and synteny. The green sulfur bacteria (GSB) are equipped with a core genome that sustains their anoxygenic phototrophic lifestyle by photosynthesis, sulfur oxidation, and CO2 fixation. Whole-genome gene family and single gene sequence comparisons yielded similar phylogenetic trees of the sequenced chromosomes indicating a concerted vertical evolution of large gene sets. Chromosomal synteny of genes is not preserved in the phylum Chlorobi. The accessory genome is characterized by anomalous oligonucleotide usage and endows the strains with individual features for transport, secretion, cell wall, extracellular constituents, and a few elements of the biosynthetic apparatus. Giant genes are a peculiar feature of the genera Chlorobium and Prosthecochloris. The predicted proteins have a huge molecular weight of 10(6), and are probably instrumental for the bacteria to generate their own intimate (micro)environment.
引用
收藏
页码:137 / 152
页数:16
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