Molecular mechanisms of type II factor XIII deficiency: novel Gly562-Arg mutation and C-terminal truncation of the A subunit cause factor XIII deficiency as characterized in a mammalian expression system.

Molecular mechanisms of type II factor XIII deficiency: novel Gly562-Arg mutation and C-terminal truncation of the A subunit cause factor XIII deficiency as characterized in a mammalian expression system.
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II 型因子 XIII 缺乏的分子机制:新的 Gly562-Arg 突变和 A 亚基的 C 端截短导致因子 XIII 缺乏,如哺乳动物表达系统中所表征的。

DOI:
10.1182/blood.v91.8.2830.2830_2830_2838
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发表时间:
1998
期刊:
影响因子:
20.3
通讯作者:
A. Ichinose
A. Ichinose
中科院分区:
医学1区
文献类型:
--
作者:
N. Takahashi;H. Tsukamoto;H. Umeyama;G. Castaman;F. Rodeghiero;A. Ichinose

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为了探索因子 XIII 结构/功能关系的生物学和临床意义,在哺乳动物表达系统中鉴定并表征了两名 II 型缺陷患者的突变。 A亚基基因的核苷酸序列分析显示病例号。 1 在外显子 XI 中删除了 4 bp (AATT),如果没有的话。 2、Gly562(GGG)已被Arg(AGG)取代。如果没有则删除。 1 导致密码子 464 处提前终止。扩增 DNA 的限制性消化证实,这两种情况的各自突变都是纯合的。逆转录聚合酶链式反应分析表明,在第 1 种情况下,mRNA 水平大大降低。 1,而在情况1中表达的突变体mRNA的水平。 2 是正常的。分子模型计算出 Arg562 改变了 A 亚基的构象,表明分子错误折叠和/或不稳定。为了确定这些突变如何损害 A 亚基的合成,在哺乳动物细胞中表达了携带突变的重组 A 亚基。脉冲追踪实验表明,突变体合成正常,但很快消失,而野生型则保留下来。这些结果表明,两种构象改变的突变蛋白都容易快速降解,导致这些患者出现因子 XIII 缺乏。
To explore the biological and clinical implications of the structure/function relationships in factor XIII, mutations in two patients with type II deficiency were identified and characterized in a mammalian expression system. Nucleotide sequence analysis of the A subunit gene showed that case no. 1 had a deletion of 4 bp (AATT) in exon XI and that, in case no. 2, Gly562 (GGG) had been replaced by Arg(AGG). The deletion in case no. 1 leads to a premature termination at codon 464. Restriction digestion of amplified DNAs confirmed that both cases were homozygous for their respective mutations. Reverse transcription-polymerase chain reaction analysis demonstrated that the level of mRNA was greatly reduced in case no. 1, whereas the level of mutant mRNA expressed in case no. 2 was normal. Molecular modeling calculated that Arg562 changed the conformation of the A subunit, suggesting misfolding and/or destabilization of the molecule. To determine how these mutations impaired synthesis of the A subunit, recombinant A subunits bearing the mutations were expressed in mammalian cells. Pulse-chase experiments showed that the mutants were synthesized normally but disappeared rapidly, whereas the wild-type remained. These results indicate that both mutant proteins with an altered conformation become prone to rapid degradation, resulting in factor XIII deficiency in these patients.
DOI: --
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影响因子: --
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发表时间: 1996
期刊: Blood
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发表时间: 1996
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