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首页> 外文期刊>Biochemistry >An Encephalitozoon cuniculi Ortholog of the RNA Polymerase II Carboxyl-Terminal Domain (CTD) Serine Phosphatase Fcpl
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An Encephalitozoon cuniculi Ortholog of the RNA Polymerase II Carboxyl-Terminal Domain (CTD) Serine Phosphatase Fcpl

机译:RNA聚合酶II羧基末端结构域(CTD)丝氨酸磷酸酶Fcp1的Encephalitozoon cuniculi直系同源基因

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摘要

Fcpl is an essential protein serine phosphatase that dephosphorylates Ser2 or Ser5 of the RNA polymerase II carboxyl-terminal domain (CTD) heptad repeat Y~1S~2P~3T~4S~5P~6S~7.The CTD of the microsporidian parasite Encephalitozoon cuniculi consists of 15 heptad repeats,which approximates the minimal CTD length requirement for cell viability in yeast.Here we show that E.cuniculi encodes a minimized 411-aa Fcpl-like protein (EcFcpl),which consists of a DxDx(T/V) phosphatase domain and a BRCA1 carboxyl terminus (BRCT) domain but lacks the large N- and C-terminal domains found in fungal and metazoan Fcpl enzymes.Nonetheless,EcFcpl can function in lieu of Saccharomyces cerevisiae Fcpl to sustain yeast cell growth.Recombinant EcFcpl is a monomeric enzyme with intrinsic phosphatase activity against nonspecific (p-nitrophenyl phosphate) and specific (CTD-PO_4) substrates.EcFcpl dephosphorylates CTD positions Ser2 and Ser5 with similar efficacy in vitro.We exploit synthetic CTD Ser2-PO_4 and Ser5-PO4 peptides to define minimized substrates for EcFcpl and to illuminate the importance of CTD primary structure in Ser2 and Ser5 phosphatase activity.
机译:Fcpl是一种必需的蛋白质丝氨酸磷酸酶,可将RNA聚合酶II羧基末端域(CTD)七重复序列Y〜1S〜2P〜3T〜4S〜5P〜6S〜7的Ser2或Ser5脱磷酸化。由15个七肽重复序列组成,这近似于酵母中细胞活力所需的最小CTD长度。在这里,我们显示了大肠杆菌编码的最小化411-aa Fcpl-样蛋白(EcFcpl),由DxDx(T / V)组成磷酸酶结构域和BRCA1羧基末端(BRCT)结构域,但缺少在真菌和后生Fcpl酶中发现的大的N和C末端结构域,尽管如此,EcFcpl可以代替酿酒酵母Fcpl来维持酵母细胞的生长。一种对非特异性(p-硝基苯基磷酸酯)和特异性(CTD-PO_4)底物具有固有磷酸酶活性的单体酶.EcFcpl在体外以相似的功效使CTD位置Ser2和Ser5脱磷酸化。我们利用合成的CTD Ser2-PO_4和Ser 5-PO4肽可定义EcFcp1的底物最小化,并阐明CTD一级结构在Ser2和Ser5磷酸酶活性中的重要性。

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