Replication factor C1, the large subunit of replication factor C, is proteolytically truncated in Hutchinson-Gilford progeria syndrome.

Replication factor C1, the large subunit of replication factor C, is proteolytically truncated in Hutchinson-Gilford progeria syndrome.
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DOI:
10.1111/j.1474-9726.2011.00779.x
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发表时间:
2012-04
期刊:
影响因子:
7.8
通讯作者:
Zou Y
Zou Y
中科院分区:
生物学1区
文献类型:
--
作者:
Tang H;Hilton B;Musich PR;Fang DZ;Zou Y

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Hutchinson-Gilford 早衰综合症 (HGPS) 是一种罕见的遗传性疾病,由 LMNA 基因突变导致,产生突变核纤层蛋白 A 蛋白(早衰蛋白)。早老素还与生理衰老和相关疾病相关。然而,早衰素如何导致早衰症仍不清楚。在这里,我们报道复制因子 C 的大亚基 (RFC1) 在 HGPS 细胞中被切割,导致产生约 75 kDa 的截短 RFC1,这似乎在将 PCNA 和 pol δ 加载到 DNA 上进行复制方面存在缺陷。有趣的是,这种切割可以被丝氨酸蛋白酶抑制剂抑制,这表明 RFC1 被丝氨酸蛋白酶切割。由于 RFC 在 DNA 复制中的关键作用,我们的研究结果为观察到的 HPGS 复制停滞和过早衰老表型提供了机制解释,并可能导致 HGPS 治疗的新策略。此外,这种独特的 RFC1 截短形式可以作为 HGPS 的潜在标记。
Hutchinson-Gilford progeria syndrome (HGPS) is a rare genetic disorder due to a LMNA gene mutation which produces a mutant lamin A protein (progerin). Progerin also has been correlated to physiological aging and related diseases. However, how progerin causes the progeria remains unknown. Here we report that the large subunit (RFC1) of replication factor C is cleaved in HGPS cells, leading to the production of a truncated RFC1 of ~75 kDa which appears to be defective in loading PCNA and pol δ onto DNA for replication. Interestingly, the cleavage can be inhibited by a serine protease inhibitor, suggesting that RFC1 is cleaved by a serine protease. Due to the crucial role of RFC in DNA replication our findings provide a mechanistic interpretation for the observed replicative arrest and premature aging phenotypes of HPGS, and may lead to novel strategies in HGPS treatment. Furthermore, this unique truncated form of RFC1 may serve as a potential marker for HGPS.
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