title: Thymidylate synthases of Mycoplasma mycoides subsp. mycoides SC and Ureaplasma parvum are flavin-dependent.
abstract: Mycoplasma mycoides subsp. mycoides small colony type (M. mycoides subsp. mycoides SC) is the causative agent of contagious bovine pleuropneumonia (CBPP), one of the most serious bacterial diseases in cattle and buffalo. Ureaplasma parvum (U. parvum) colonizes the human urogenital tract, and has been associated with urethritis and premature birth. The de novo synthesis of thymidylate (dTMP) is essential and catalyzed by thymidylate synthase (TS), encoded by either the thyA or the thyX genes. No homologs to either thyA or thyX have been identified in the U. parvum and M. mycoides subsp. mycoides SC genomes. Here we report the identification, partial purification and characterization of M. mycoides subsp. mycoides and U. parvum TS. Our results showed that the M. mycoides subsp. mycoides SC and U. parvum TS apparently are flavin-dependent, having similar enzymatic activities but no sequence homology to other known ThyX proteins. Up to date there are 11 Mollicutes species lacking both thyA and thyX gene. Therefore, the finding described here most likely constitutes a new enzyme family specific for Mollicutes. These M. mycoides subsp. mycoides SC and U. parvum TS enzymes could be ideal targets for future development of agents against Myoplasma infections.
authors.affiliation: Department of Anatomy, Physiology and Biochemistry, Section of Veterinary Medical Biochemistry, Swedish University of Agricultural Sciences, The Biomedical Centre, Uppsala, Sweden.
authors.forename: Rahma
authors.initials: R
authors.lastname: Wehelie
authors.forename: Staffan
authors.initials: S
authors.lastname: Eriksson
authors.forename: Göran
authors.initials: G
authors.lastname: Bölske
authors.forename: Liya
authors.initials: L
authors.lastname: Wang
mesh_terms: D002850:Chromatography, Gel; D002852:Chromatography, Ion Exchange; D004591:Electrophoresis, Polyacrylamide Gel; D005415:Flavins / Q000378:metabolism*; D007700:Kinetics; D009176:Mycoplasma mycoides / Q000201:enzymology*; D013940:Thymidylate Synthase / Q000302:isolation & purification / Q000378:metabolism*; D014509:Ureaplasma / Q000201:enzymology*
chemical_list: D005415:Flavins; D013940:Thymidylate Synthase