The unexpected function of a Flavin-dependent oxidoreductase from Variovorax paradoxus TBEA6

The unexpected function of a Flavin-dependent oxidoreductase from Variovorax paradoxus TBEA6
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来自 Variovorax paradoxus TBEA6 的黄素依赖性氧化还原酶的意想不到的功能

DOI:
10.1093/femsle/fny011
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发表时间:
2018
影响因子:
2.1
通讯作者:
Steinbüchel
Steinbüchel
中科院分区:
生物学4区
文献类型:
--
作者:
Meinert;Schürmann;Domeyer;Poehlein;Daniel;Steinbüchel

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3,3 '-硫代二丙酸(TDP)在食品和化妆品工业中用作添加剂,并用作生物技术聚硫酯生产的前体底物。在本研究之前,在Variovorax paradoxusTBEA 6中研究了其催化作用。据报道,将转座子Tn 5::mobo插入到与黄素依赖性氧化还原酶(fox)具有高度同源性的基因中导致TDP生长受损。因此,假设TDP的初始裂解由FAD依赖性氧化还原酶催化(Fox,VPARA_05580)。因此,FOX异源表达为硫氧还蛋白融合蛋白。体积排阻色谱分析表明FoxTBEA 6是一个同源二聚体结构,并含有辅因子FAD.体外实验表明FoxTBEA 6是一种D-2-羟基酸特异性脱氢酶,Ni ~(2+)、Co ~(2+)或Zn ~(2+)均能增强其活性.未观察到FoxTBEA 6对TDP的切割。这些发现与转座子突变体和之前发表的缺失突变体V的TDP限制生长相反。paradoxusTBEA6 Δfox.在这项研究中,这一矛盾是通过产生额外的缺失突变体,其中部分或完全删除的oxdoesn 't影响TDP的利用,和单核苷酸多态性(SNPs)在V的定位进行调查。paradoxusTBEA6 Δfox.
3,3’-Thiodipropionic acid (TDP) is used as an additive in food and cosmetic industry and as precursor substrate for biotechnical polythioester production. Its catabolism was investigated inVariovorax paradoxusTBEA6 previous to this study. It was reported that the insertion of the transposon Tn5::mobinto a gene showing high homology to flavin-dependent oxidoreductases (fox) resulted in impaired growth with TDP. Therefore, it was assumed that the initial cleavage of TDP is catalyzed by an FAD-dependent oxidoreductase (Fox, VPARA_05580). Accordingly,foxwas heterologously expressed as a thioredoxin fusion protein. Analytical size exclusion chromatography revealed a homodimeric structure and the presence of the cofactor FAD.In vitroexperiments showed that FoxTBEA6is a D-2-hydroxy acid specific dehydrogenase and that its activity is enhanced in presence of either Ni2+, Co2+or Zn2+. Cleavage of TDP by FoxTBEA6was not observed. The findings are contrary to restricted growth with TDP of the transposon mutants and the previously published deletion mutantV. paradoxusTBEA6 Δfox. In this study, this contradiction was investigated by generation of additional deletion mutants, in which partial or complete deletion offoxdid not affect utilization of TDP, and the mapping of single nucleotide polymorphisms (SNPs) inV. paradoxusTBEA6 Δfox.
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