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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Purification and characterization of an ATP-dependent amidohydrolase, N-methylhydantoin amidohydrolase, from Pseudomonas putida 77.

N-Methylhydantoin amidohydrolase, an ATP-dependent amidohydrolase involved in microbial degradation of creatinine, was purified 70-fold to homogeneity, with a 62% overall recovery, and was crystallized from Pseudomonas putida 77. The enzyme has a relative molecular mass of 300,000. It is a tetramer of two identical small subunits (M(r) 70,000) and two identical large subunits (M(r) 80,000). The enzyme requires ATP for the amidohydrolysis of N-methylhydantoin and vice versa. Mg2+, Mn2+ or Co2+, and K+, NH4+, Rb+ or Cs+, were absolutely required concomitantly for the enzyme activity as divalent and monovalent cations, respectively. The Km and Vmax values for N-methylhydantoin were 32 microM and 9.0 mumol.min-1.mg protein-1. The hydrolysis of amide compounds and coupled hydrolysis of ATP were observed with hydantoin, DL-5-methylhydantoin, glutarimide and succimide in addition to N-methylhydantoin. 2-Pyrrolidone, 2-oxazolidone, delta-valerolactam, 2,4-thiazolidinedione, 2-imidazolidone, D-5-oxoproline methyl ester, DL-5-oxoproline methyl ester, and naturally occurring pyrimidine compounds, i.e. dihydrouracil, dihydrothymine, uracil, and thymine, effectively stimulated ATP hydrolysis by the enzyme without undergoing detectable self-hydrolysis.[1]

References

  1. Purification and characterization of an ATP-dependent amidohydrolase, N-methylhydantoin amidohydrolase, from Pseudomonas putida 77. Ogawa, J., Kim, J.M., Nirdnoy, W., Amano, Y., Yamada, H., Shimizu, S. Eur. J. Biochem. (1995) [Pubmed]
 
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