Motif CXCC in nitrile hydratase activator is critical for NHase biogenesis in vivo.
Nitrile hydratase (NHase) activator from Rhodococcus sp. N-771 is required for NHase functional expression. The motif 73CXCC76 in the NHase activator sequence was here revealed to be vital for its function by site-directed mutagenesis. All three substitutions of the cysteines by serines resulted in a much lower level of expression of active NHase. Furthermore, interaction between NHase activator and NHase was detected and the critical role of NHase activator was not exhibited in the cysteine oxidization process of NHase. These findings suggest NHase activator mainly participates in iron trafficking in NHase biogenesis as an iron type metallochaperone.
The Institute of Physical and Chemical Research, Wako Shi, 351-0198 Saitama, Japan. junlu@ns.ciac.jl.cn
Jun
J
Lu
Yujuan
Y
Zheng
Hiromi
H
Yamagishi
Masafumi
M
Odaka
Masanari
M
Tsujimura
Mizuo
M
Maeda
Isao
I
Endo
D020816:Amino Acid Motifs; D000595:Amino Acid Sequence; D019943:Amino Acid Substitution; D001665:Binding Sites; D016384:Consensus Sequence; D003545:Cysteine / Q000235:genetics / Q000378:metabolism; D017931:DNA Primers / Q000235:genetics; D004789:Enzyme Activation; D004926:Escherichia coli / Q000201:enzymology / Q000235:genetics; D015870:Gene Expression; D006836:Hydro-Lyases / Q000096:biosynthesis* / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D016297:Mutagenesis, Site-Directed; D010084:Oxidation-Reduction; D011485:Protein Binding; D021122:Protein Subunits; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D012240:Rhodococcus / Q000201:enzymology* / Q000235:genetics; D012694:Serine / Q000235:genetics / Q000378:metabolism
D017931:DNA Primers; D021122:Protein Subunits; D011994:Recombinant Proteins; D012694:Serine; D006836:Hydro-Lyases; C048831:nitrile hydratase; D003545:Cysteine