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. 1990 Feb;172(2):956–966. doi: 10.1128/jb.172.2.956-966.1990

DNA sequences of genes encoding Acinetobacter calcoaceticus protocatechuate 3,4-dioxygenase: evidence indicating shuffling of genes and of DNA sequences within genes during their evolutionary divergence.

C Hartnett 1, E L Neidle 1, K L Ngai 1, L N Ornston 1
PMCID: PMC208524  PMID: 2298704

Abstract

The DNA sequence of a 2,391-base-pair HindIII restriction fragment of Acinetobacter calcoaceticus DNA containing the pcaCHG genes is reported. The DNA sequence reveals that A. calcoaceticus pca genes, encoding enzymes required for protocatechuate metabolism, are arranged in a single transcriptional unit, pcaEFDBCHG, whereas homologous genes are arranged differently in Pseudomonas putida. The pcaG and pcaH genes represent separate reading frames respectively encoding the alpha and beta subunits of protocatechuate 3,4-dioxygenase (EC 1.13.1.3); previously a single designation, pcaA, had been used to represent DNA encoding this enzyme. The alpha and beta protein subunits appear to share common ancestry with each other and with catechol 1,2-dioxygenases from A. calcoaceticus and P. putida. Marked conservation of amino acid sequence is observed in a region containing two histidyl residues and two tyrosyl residues that appear to ligate iron within each oxygenase. In some regions within the aligned oxygenase sequences, DNA sequences appear to be conserved at a level beyond the extent that might have been demanded by selection at the level of protein. In other regions, divergence of DNA sequences appears to have been achieved by substitution of DNA sequence from one genetic segment into another. The results are interpreted to be the consequence of sequence exchange by gene conversion between slipped strands of DNA during evolutionary divergence; mismatch repair between slipped strands may contribute to the maintenance of DNA sequence in divergent genes.

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Selected References

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