Horizontal Gene Transfer of Zinc and Non-zinc Forms of Bacterial Ribosomal Protein S4

Overview

Journal BMC Evol Biol

Publisher Biomed Central

Specialty Biology

Date 2009 Jul 31

PMID 19640295

Citations 15

Authors

Ke Chen

Elijah Roberts

Zaida Luthey-Schulten

Affiliations

Soon will be listed here.

Abstract

Background: The universal ribosomal protein S4 is essential for the initiation of small subunit ribosomal assembly and translational accuracy. Being part of the information processing machinery of the cell, the gene for S4 is generally thought of as being inherited vertically and has been used in concatenated gene phylogenies. Here we report the evolution of ribosomal protein S4 in relation to a broad sharing of zinc/non-zinc forms of the gene and study the scope of horizontal gene transfer (HGT) of S4 during bacterial evolution.

Results: In this study we present the complex evolutionary history of ribosomal protein S4 using 660 bacterial genomes from 16 major bacterial phyla. According to conserved characteristics in the sequences, S4 can be classified into C+ (zinc-binding) and C- (zinc-free) variants, with 26 genomes (mainly from the class Clostridia) containing genes for both. A maximum likelihood phylogenetic tree of the S4 sequences was incongruent with the standard bacterial phylogeny, indicating a departure from strict vertical inheritance. Further analysis using the genome content near the S4 genes, which are usually located in a conserved gene cluster, showed not only that HGT of the C- gene had occurred at various stages of bacterial evolution, but also that both the C- and C+ genes were present before the individual phyla diverged. To explain the latter, we theorize that a gene pool existed early in bacterial evolution from which bacteria could sample S4 gene variants, according to environmental conditions. The distribution of the C+/- variants for seven other zinc-binding ribosomal proteins in these 660 bacterial genomes is consistent with that seen for S4 and may shed light on the evolutionary pressures involved.

Conclusion: The complex history presented for "core" protein S4 suggests the existence of a gene pool before the emergence of bacterial lineages and reflects the pervasive nature of HGT in subsequent bacterial evolution. This has implications for both theoretical models of evolution and practical applications of phylogenetic reconstruction as well as the control of zinc economy in bacterial cells.

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