AurF from Streptomyces thioluteus and a possible new family of manganese/iron oxygenases.
We recently reported that the R2 subunit of class Ic ribonucleotide reductase from Chlamydia trachomatis contains a heterodinuclear Mn/Fe redox cofactor [Jiang, W., Yun, D., Saleh, L., Barr, E. W., Xing, G., Hoffart, L. M., Maslak, M.-A., Krebs, C., and Bollinger, J. M., Jr. (2007) Science 316, 1188-1191]. The N-oxygenase, AurF, from Streptomyces thioluteus catalyzes the six-electron oxidation of p-aminobenzoate to p-nitrobenzoate and contains the EX2HX60-180EX2H sequence motif previously used to identify proteins with non-heme diiron clusters. Two research groups independently obtained evidence for the presence of iron and manganese in preparations of AurF. The electron paramagnetic resonance (EPR) spectrum of purified, resting AurF presented in one of these studies is markedly similar to the spectrum of the MnIII/FeIII form of C. trachomatis R2. We propose that S. thioluteus AurF also may harbor a heterodinuclear Mn/Fe cofactor, which it may use to activate O2 for oxidation of the aryl amine to the nitro compound. Hypothetical proteins encoded in the genomes of several other bacteria have similar sequences and may also be members of this nascent family of oxygen-activating Mn/Fe proteins.
Krebs
Carsten
C
Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, USA. ckrebs@psu.edu
Matthews
Megan L
ML
Jiang
Wei
W
Bollinger
J Martin
JM
D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000737:chemistry*; D002384:Catalysis; D002692:Chlamydia trachomatis / Q000201:enzymology; D002867:Chromones / Q000737:chemistry; D004578:Electron Spin Resonance Spectroscopy; D007501:Iron / Q000737:chemistry*; D008345:Manganese / Q000737:chemistry*; D008969:Molecular Sequence Data; D010105:Oxygenases / Q000737:chemistry*; D016415:Sequence Alignment; D013302:Streptomyces / Q000201:enzymology*
D001426:Bacterial Proteins; D002867:Chromones; D008345:Manganese; D007501:Iron; D010105:Oxygenases; C012198:aureothin