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J. Bacteriol., Jan 1997, 370-381, Vol 179, No. 2
D Eulberg, LA Golovleva and M Schlomann
The biochemical characterization of the muconate and the chloromuconate
cycloisomerases of the chlorophenol-utilizing Rhodococcus erythropolis
strain 1CP previously indicated that efficient chloromuconate conversion
among the gram-positive bacteria might have evolved independently of that
among gram-negative bacteria. Based on sequences of the N terminus and of
tryptic peptides of the muconate cycloisomerase, a fragment of the
corresponding gene has now been amplified and used as a probe for the
cloning of catechol catabolic genes from R. erythropolis. The clone thus
obtained expressed catechol 1,2-dioxygenase, muconate cycloisomerase, and
muconolactone isomerase activities. Sequencing of the insert on the
recombinant plasmid pRER1 revealed that the genes are transcribed in the
order catA catB catC. Open reading frames downstream of catC may have a
function in carbohydrate metabolism. The predicted protein sequence of the
catechol 1,2-dioxygenase was identical to the one from Arthrobacter sp.
strain mA3 in 59% of the positions. The chlorocatechol 1,2-dioxygenases and
the chloromuconate cycloisomerases of gram-negative bacteria appear to be
more closely related to the catechol 1,2-dioxygenases and muconate
cycloisomerases of the gram-positive strains than to the corresponding
enzymes of gram-negative bacteria.
Copyright © 1997, American Society for Microbiology
Characterization of catechol catabolic genes from Rhodococcus erythropolis 1CP
Institut fur Mikrobiologie, Universitat Stuttgart, Germany.
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