Abstract:
:A cDNA was cloned from Ruta graveolens cells encoding a novel O-methyltransferase (OMT) with high similarity to orcinol or chavicol/eugenol OMTs, but containing a serine-rich N-terminus and a 13 amino acid insertion between motifs IV and V. Expression in Escherichia coli revealed S-adenosyl-l-methionine-dependent OMT activity with methoxylated phenols only with an apparent Km of 20.4 for the prime substrate 3,5-dimethoxyphenol. The enzyme forms a homodimer of 84 kDa, and the activity was insignificantly affected by 2.0 mM Ca2+ or Mg2+, whereas Fe2+, Co2+, Zn2+, Cu2+ or Hg2+ were inhibitory (78-100%). Dithiothreitol (DTT) suppressed the OMT activity. This effect was examined further, and, in the presence of Zn2+ as a potential thiol methyltransferase (TMT) cofactor, the recombinant OMT methylated DTT to DTT-monomethylthioether. Sets of kinetic OMT experiments with 3,5-dimethoxyphenol at various Zn2+/DTT concentrations revealed the competitive binding of DTT with an apparent Ki of 52.0 microM. Thus, the OMT exhibited TMT activity with almost equivalent affinity to the thiol pseudosubstrate which is structurally unrelated to methoxyphenols.
journal_name
Arch Biochem Biophysjournal_title
Archives of biochemistry and biophysicsauthors
Burga L,Wellmann F,Lukacin R,Witte S,Schwab W,Schröder J,Matern Udoi
10.1016/j.abb.2005.05.026subject
Has Abstractpub_date
2005-08-01 00:00:00pages
54-64issue
1eissn
0003-9861issn
1096-0384pii
S0003-9861(05)00232-8journal_volume
440pub_type
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pub_type: 杂志文章
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pub_type: 杂志文章
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更新日期:1992-04-01 00:00:00
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pub_type: 杂志文章,评审
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pub_type: 杂志文章
doi:10.1016/0003-9861(85)90574-0
更新日期:1985-09-01 00:00:00
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journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1016/j.abb.2006.03.009
更新日期:2006-06-15 00:00:00
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更新日期:2004-08-01 00:00:00
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pub_type: 杂志文章
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pub_type: 杂志文章
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pub_type: 杂志文章
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更新日期:2015-10-01 00:00:00
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pub_type: 杂志文章
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更新日期:2017-06-01 00:00:00
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journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
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更新日期:2013-01-15 00:00:00
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pub_type: 杂志文章
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更新日期:1994-08-01 00:00:00
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pub_type: 杂志文章
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更新日期:1990-02-01 00:00:00
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pub_type: 杂志文章
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更新日期:1989-04-01 00:00:00