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J Mol Evol. 1998 Jun;46(6):716-20.

Signature sequences in diverse proteins provide evidence of a close evolutionary relationship between the Deinococcus-thermus group and cyanobacteria.

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Department of Biochemistry, McMaster University, Hamilton, Ontario, Canada L8N 3Z5.


A number of proteins have been identified that contain prominent sequence signatures that are uniquely shared by the members of the Deinococcus-Thermus genera and the cyanobacterial species but which are not found in any of the other eubacterial or archaebacterial homologs. The proteins containing such sequence signatures include (1) the DnaJ/Hsp40 family of proteins, (2) DNA polymerase I, (3) the protein synthesis elongation factor EF-Tu, and (4) the elongation factor EF-Ts. A strong affinity of the Deinococcus-Thermus species to cyanobacteria is also seen in the phylogenetic trees based on Hsp70 and DnaJ sequences. These results provide strong evidence of a close and specific evolutionary relationship between species belonging to these two eubacterial divisions.

[Indexed for MEDLINE]

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