5-Carboxymethyl-2-hydroxymuconic semialdehyde dehydrogenases of Escherichia coli C and Klebsiella pneumoniae M5a1 show very high N-terminal sequence homology.
5-Carboxymethyl-2-hydroxymuconic semialdehyde (CHMS) dehydrogenase from Escherichia coli C and Klebsiella pneumoniae M5a1 have been purified and some of their properties studied. The apparent Km values for NAD and CHMS were 11.7 +/- 1.5 microM and 5.2 +/- 1.9 microM, respectively, for the K. pneumoniae enzyme, and 19.5 +/- 2.7 microM and 9.2 +/- 1.4 microM, respectively, for the E. coli enzyme. Both enzymes were optimally active at pH 7.5 in sodium phosphate buffer. They had subunit molecular weights of 52,000 (+/- 1000) and the native enzymes appeared to be dimers of identical subunits. The first 20 residues of their N-terminal amino acid sequences were 90% homologous. A degenerate oligonucleotide probe constructed to a six amino acid sequence common to both enzymes gave strong hybridization with DNA from E. coli strains B and W as well as with E. coli C and K. pneumoniae but little or no hybridization to DNA from E. coli K12 or Pseudomonas putida.
Fawcett
T
T
Department of Biochemistry, University of Leicester, U.K.
Garrido-Pertierra
A
A
Cooper
R A
RA
D000445:Aldehyde Oxidoreductases / Q000235:genetics* / Q000378:metabolism; D000595:Amino Acid Sequence; D001483:Base Sequence; D004269:DNA, Bacterial / Q000235:genetics; D004926:Escherichia coli / Q000201:enzymology* / Q000235:genetics; D007700:Kinetics; D007711:Klebsiella pneumoniae / Q000201:enzymology* / Q000235:genetics; D008969:Molecular Sequence Data; D008970:Molecular Weight; D012689:Sequence Homology, Nucleic Acid; D013045:Species Specificity
D004269:DNA, Bacterial; C021389:2-hydroxy-4-carboxymucconate-6-semialdehyde dehydrogenase; D000445:Aldehyde Oxidoreductases