type	Journal Article
authors	Xu M1, Zhang X, Rao Z, Yang J, Dou W, Jin J, Xu Z.
title	Cloning, expression and characterization of N-acetylornithine aminotransferase from Corynebacterium crenatum and its effects on L-arginine fermentation. [Article in Chinese]
journal	Sheng Wu Gong Cheng Xue Bao
Activity	2.6.1.11
Family	2.6.1.11
sel	selected
ui	22016985
year	(2011)
volume	27
number	7
pages	1013-23
abstract	N-Acetylornithine aminotransferase (EC 2.6.1.11, ACOAT) catalyzes the conversion of N-acetylglutamic semialdehyde to N-acetylornithine, the forth step involved in the L-arginine biosynthetic pathways. We studied the enzyme properties to set up reliable theoretical basis for the arginine fermentation optimization. ACOAT encoding gene argD was cloned from an industrial L-arginine producer Corynebacterium crenatum SYPA 5-5. Analysis of argD sequences revealed that only one ORF existed, which coded a peptide of 390 amino acids with a calculated molecular weight of 41.0 kDa. The argD gene from C. crenatum SYPA 5-5 was expressed both in Escherichia coli BL21 and C. crenatum SYPA. Then ACOAT was purified by Ni-NTA affinity chromatography and its specific enzyme activity was 108.2 U/g. Subsequently, the expression plasmid pJCtac-CcargD was transformed into C. crenatum SYPA and the specific activity of ACOAT was improved evidently in the recombinant C. crenatum CCD. Further fermentative character of CCD1 was also analyzed. The results showed that the L-arginine producing ability of the recombinant strain was 39.7 g/L improved by 14.7%.
last changed	2018/04/13 13:23