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- W2073886458 abstract "We constructed the high-expression system of the alr gene from Corynebacterium glutamicum ATCC 13032 in Escherichia coli BL 21 (DE3) to characterize the enzymological and structural properties of the gene product, Alr. The Alr was expressed in the soluble fractions of the cell extract of the E. coli clone and showed alanine racemase activity. The purified Alr was a dimer with a molecular mass of 78 kDa. The Alr required pyridoxal 5'-phosphate (PLP) as a coenzyme and contained 2 mol of PLP per mol of the enzyme. The holoenzyme showed maximum absorption at 420 nm, while the reduced form of the enzyme showed it at 310 nm. The Alr was specific for alanine, and the optimum pH was observed at about nine. The Alr was relatively thermostable, and its half-life time at 60 degrees C was estimated to be 26 min. The K(m) and V(max) values were determined as follows: l-alanine to d-alanine, K(m) (l-alanine) 5.01 mM and V(max) 306 U/mg; d-alanine to l-alanine, K(m) (d-alanine) 5.24 mM and V(max) 345 U/mg. The K(eq) value was calculated to be 1.07 and showed good agreement with the theoretical value for the racemization reaction. The high substrate specificity of the Alr from C. glutamicum ATCC 13032 is expected to be a biocatalyst for d-alanine production from the l-counter part." @default.
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- W2073886458 date "2006-10-01" @default.
- W2073886458 modified "2023-10-16" @default.
- W2073886458 title "Expression of alr gene from Corynebacterium glutamicum ATCC 13032 in Escherichia coli and molecular characterization of the recombinant alanine racemase" @default.
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- W2073886458 doi "https://doi.org/10.1016/j.jbiotec.2006.04.002" @default.
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