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笑世狂龙

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DPD has been purified from liver tissues of rat [15,36], pig
[16,17], bovine [18] and man [19] as well as from Alcaligenes
eutrophus [20]. The cloning of the cDNA of porcine DPD
[35] allowed the overproduction of the enzyme in Escherichia
coli cells and its purification to homogeneity in large
quantities [17]. The enzyme is a homodimer of 2111 kDa
and contains a number of redox cofactors [16]. Each subunit
of 1025 amino acids carries one FMN, one FAD as well as 16
nonheme irons and 16 acid-labile sulfur atoms [21]. Analysis
of the amino acid sequence led to the conclusion that pig DPD
likely contained four [4Fe–4S] clusters per subunit, two in the
N-terminal Cys-rich region and two in a stretch of 50 amino
acids at the C-terminus with sequence similarity to bacterial
eight-iron ferredoxins [22,23]

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笑世狂龙(金币+1): 你的太短了 谢谢你的参与。 2011-03-10 11:11:14
DPD是从小鼠,猪,牛,人体肝脏组织以及从真养产碱杆菌提取纯化而来的
3楼2011-03-10 10:38:37
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地图蜗牛

银虫 (小有名气)


笑世狂龙(金币+19, 翻译EPI+1): 谢谢你的翻译。谢谢 2011-03-10 11:10:44
人们已从大鼠、猪、牛和人类肝脏以及真养产碱杆菌属纯化到DPD。猪PDPcDNA的合成使得可以在大肠杆菌中过表达这个酶,并且获得大量纯化的均一蛋白。这个酶是一个2 111 kD的同型二聚体,含有大量氧化还原协同因子。每个亚单位有1025个氨基酸,携带一个FMN,一个FAD以及16个非血红素铁离子和16个不耐酸硫原子。通过对氨基酸序列的分析发现猪DPD每个亚单位可能含有4个[4Fe–4S]簇,两个位于N末端富半胱氨酸区,两个位于C末端的一段50个氨基酸上,序列与细菌的含8个铁离子的铁氧还蛋白类似。
4楼2011-03-10 10:50:38
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