Examination of Ferrochelatase Mutations That Cause Erythropoietic Protoporphyria

Examination of Ferrochelatase Mutations That Cause Erythropoietic Protoporphyria
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导致红细胞生成性原卟啉症的铁螯合酶突变的检查

DOI:
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发表时间:
1998
期刊:
影响因子:
--
通讯作者:
H. Dailey
H. Dailey
中科院分区:
--
文献类型:
--
作者:
V. M. Sellers;T. Dailey;H. Dailey

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铁螯合酶(E.C. 4.99.1.1),催化血红素生物合成途径中的末端步骤的酶,是人类遗传性疾病红细胞生成性原卟啉症(EPP)中的缺陷位点。以前已经证明,EPP患者可能有错义突变,导致氨基酸取代,早期链终止或外显子缺失。虽然已经清楚地证明两个错义突变导致酶活性降低,但从未显示特定外显子缺失可能具有什么影响。在目前的工作中,重组人铁螯合酶已被改造为具有对应于外显子3至11的单个外显子缺失。当在大肠杆菌中表达时,这些都不具有显著的酶活性,并且都缺乏[2Fe-2S]簇。检测了人类错义突变之一F417 S和该位点的一系列氨基酸置换(即F417 W、F417 Y和F417 L)。除F417 L外,所有菌株均缺乏酶活性,并且在体内或体外分离时均不含[2Fe-2S]簇。
Ferrochelatase (E.C. 4.99.1.1), the enzyme that catalyzes the terminal step in the heme biosynthetic pathway, is the site of defect in the human inherited disease erythropoietic protoporphyria (EPP). Previously it has been demonstrated that patients with EPP may have missense mutations leading to amino acid substitutions, early chain termination, or exon deletions. While it has been clearly demonstrated that two missense mutations result in lowered enzyme activity, it has never been shown what effect specific exon deletions may have. In the current work, recombinant human ferrochelatase has been engineered to have individual exon deletions corresponding to exons 3 through 11. When expressed in Escherichia coli, none of these possesses significant enzyme activity and all lack the [2Fe-2S] cluster. One of the human missense mutations, F417S, and a series of amino acid replacements at this site (ie, F417W, F417Y, and F417L) were examined. With the exception of F417L, all lacked enzyme activity and did not contain the [2Fe-2S] cluster in vivo or as isolated in vitro.
DOI: 10.1021/bi00168a003
发表时间: 1994-01-18
期刊: BIOCHEMISTRY
影响因子: 2.9
作者:
DAILEY, HA;FINNEGAN, MG;JOHNSON, MK
通讯作者: JOHNSON, MK
鼠亚铁螯合酶的体外和体内合成。
DOI: 10.1042/bj2540799
发表时间: 1988
期刊: The Biochemical journal
影响因子: --
作者:
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发表时间: 1983-10
期刊: The Journal of biological chemistry
影响因子: --
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通过辐射灭活原位测定亚铁螯合酶的功能大小。
DOI: --
发表时间: 1991
期刊: The Journal of biological chemistry
影响因子: --
作者:
Straka,JG;Bloomer,JR;Kempner,ES
通讯作者: Kempner,ES
筛选亚铁螯合酶突变:红细胞生成原卟啉症的分子异质性。
DOI: 10.1016/0925-4439(94)90077-9
发表时间: 1994
期刊: Biochimica et biophysica acta
影响因子: --
作者:
Wang,X;Poh-Fitzpatrick,M;Taketani,S;Chen,T;Piomelli,S
通讯作者: Piomelli,S