Eukaryotic TYW1 Is a Radical SAM Flavoenzyme.

Eukaryotic TYW1 Is a Radical SAM Flavoenzyme.
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DOI:
10.1021/acs.biochem.1c00349
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发表时间:
2021-07-13
期刊:
影响因子:
2.9
通讯作者:
Bandarian V
Bandarian V
中科院分区:
生物学3区
文献类型:
--
作者:
Young AP;Bandarian V

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TYW 1是一种自由基S-腺苷-L-甲硫氨酸(SAM)酶,催化丙酮酸和含tRNAPhe的N-甲基鸟苷缩合,形成含tRNAPhe的4-去甲基鸟苷。TYW 1的同源物在古生菌和真核生物中都有发现,其中古生菌同源物由单个结构域组成,而真核生物同源物除了与古生菌同源物共享的自由基SAM结构域之外还含有黄素结合结构域。本研究中,TYW 1从S.酿酒酵母(ScTYW 1)在E. coli中,并纯化至均一。ScTYW 1纯化时,每摩尔蛋白质分别含有0.54 ± 0.07和4.2 ± 1.9当量的黄素单胞苷脂(FMN)和铁,表明蛋白质中约50%充满Fe-S簇和FMN。虽然NADPH或NADH都足以产生活性,但当与黄素核苷酸组合使用时,观察到显著更多的产物。ScTYW 1是自由基SAM黄素酶的第一个例子,单独与NAD(P)H有活性。
TYW1 is a radical S-adenosyl-l-methionine (SAM) enzyme that catalyzes the condensation of pyruvate and N-methylguanosine containing tRNAPhe, forming 4-demethylwyosine containing tRNAPhe. Homologs of TYW1 are found in both archaea and eukarya, with archaeal homologs consisting of a single domain while eukaryal homologs contain a flavin binding domain in addition to the radical SAM domain shared with archaeal homologs. In this study, TYW1 from S. cerevisiae (ScTYW1) was heterologously expressed in E. coli and purified to homogeneity. ScTYW1 purifies with 0.54 ± 0.07 and 4.2 ± 1.9 equivalents of flavin mononucleotide (FMN) and iron, respectively, per mol of protein, suggesting the protein is ~50% replete with Fe-S clusters and FMN. While both NADPH or NADH are sufficient for activity, significantly more product is observed when used in combination with flavin nucleotides. ScTYW1 is the first example of a radical SAM flavoenzyme, active with NAD(P)H alone.
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