Purification and characterization of a Baeyer‒Villiger mono-oxygenase from Rhodococcus erythropolis DCL14 involved in three different monocyclic monoterpene degradation pathways
作者:Mariët J. VAN DER WERF
DOI:10.1042/0264-6021:3470693
日期:2000.5.1
A Baeyer-Villiger mono-oxygenase (BVMO), catalysing the NADPH- and oxygen-dependent oxidation of the monocyclic monoterpene ketones 1-hydroxy-2-oxolimonene, dihydrocarvone and menthone, was purified to homogeneity from Rhodococcus erythropolis DCL14. Monocyclic monoterpene ketone mono-oxygenase (MMKMO) is a monomeric enzyme of molecular mass 60 kDa. It contains 1 mol of FAD/monomer as the prosthetic
从红红球菌DCL14中纯化Baeyer-Villiger单加氧酶(BVMO),以催化NADPH和氧依赖性氧化单环单萜酮1-羟基-2-氧杂环丁烯酮,二氢香芹酮和薄荷酮。单环单萜酮单加氧酶(MMKMO)是分子量为60 kDa的单体酶。它包含1摩尔FAD /单体作为修复基团。N末端氨基酸序列显示出与许多其他NADPH依赖性和含FAD(1型)BVMO同源。在pH 9和35摄氏度下测量了最大的酶活性。MMKMO具有广泛的底物特异性,可催化大量单环单萜酮和取代的环己酮的内酯化。天然底物1-羟基-2-氧杂环丁烯,将二氢香芹酮和薄荷酮化学计量地转化为3-异丙烯基-6-氧庚酸(MMKMO形成的内酯的自发重排产物),4-异丙烯基-7-甲基-2-氧代-氧杂戊酮和7-异丙基-4-甲基-2 -氧代-氧杂戊酮。MMKMO催化的异二氢香芹酮的转化显示出与二氢香芹酮相反的区域选择性。在这种情况下,形成6-异丙烯基-3-甲