Nucleic Acids Research, 1992, Vol. 20, No. 4 839-845
© 1992
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Sequence and complementation analysis of recF genes from Escherichia coli, Salmonella typhimurium, Pseudomonas putida and Bacillus subtilis: evidence for an essential phosphate binding loop
Department of Molecular and Cell Biology University of California, Berkeley, CA 94720, USA
Received October 21, 1991. Revised January 13, 1992. Accepted January 13, 1992.
We have compared the recF genes from Escherichia coli K-12, Salmonella typhimurium, Pseudomonas putida, and Bacillus subtilisat the DNA and amlno acid sequence levels. To do this we determined the complete nucleotide sequence of the recF gene from Salmonella typhimurium and we completed the nucleotide sequence of recF gene from Pseudomonas putida begun by Fujlta et al. (1). We found that the RecF proteins encoded by these two genes contain respectively 92% and 38% amino acid Identity with the E. coli RecF protein. Additionally, we have found that the S. typhimurium and P. putida recF genes will complement an E.coli recF mutant, but the recF gene from Bacillus subtilis [showing about 20% identity with E. coli (2)] will not. Amino acid sequence alignment of the four proteins identified four highly conserved regions. Two of these regions are part of a putative phosphate binding loop. In one region (position 36), we changed the lysine codon (which is essential for ATPase, GTPase and kinase activity in other proteins having this phosphate binding loop) to an arginlne codon. We then tested this mutation (recF4101) on a multicopy plasmid for its ability to complement a recF chromosomal mutation and on the E. coll chromosome for its effect on senstivity to UV irradiation. The strain with recF4101 on its chromosome is as sensitive as a null recF mutant strain. The strain with the plasmid-bome mutant allele is however more UV resistant than the null mutant strain. We conclude that lysine-36 and possibly a phosphate binding loop is essential for full recF activity. Lastly we made two chimeric recF genes by exchanging the amino terminal 48 amino acids of the S. typhimuriumand E. coli recF genes. Both chimerias could complement E. coli chromosomal recF mutations.
*Present addresses:University of Washington, School of Medicine, Department of Microbiology, Seattle, WA 98195
+Present addresses:Tulane University, School of Medicine, New Orleans, LA 70112, USA
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