Identification and Characterization of Human DNA Polymerase β2, a DNA Polymerase β-Related Enzyme*

Identification and Characterization of Human DNA Polymerase β2, a DNA Polymerase β-Related Enzyme*
复制标题

人类 DNA 聚合酶 β2(一种 DNA 聚合酶 β 相关酶)的鉴定和表征*

DOI:
--
复制
发表时间:
2000
影响因子:
4.8
通讯作者:
M. Nakanishi
M. Nakanishi
中科院分区:
生物学2区
文献类型:
--
作者:
K. Nagasawa;K. Kitamura;A. Yasui;Y. Nimura;K. Ikeda;M. Hirai;A. Matsukage;M. Nakanishi

文献摘要

参考文献

被引文献

相似文献

BRCA1 COOH末端(BRCT)基序存在于许多核蛋白中,参与细胞周期调节或DNA修复。通过使用针对brct基序的简并引物进行聚合酶链式反应筛选,获得了一个与ββ(POLβ)密切相关的未知聚合酶的cDNAs。预测的POLβ2蛋白在其氨基末端含有一个BRCT基序;其COOH端与人POLβ的相应区域有33%的序列同源性。POLβ2基因以组织特异性的方式表达,转录本在睾丸中含量最高。由POL-β-2和绿色荧光蛋白组成的融合载体在转染的HeLa细胞中表现出主要的核定位。从昆虫细胞中提取的重组人Pol-β-2具有较强的DNA聚合酶活性,但不具有末端脱氧核糖核苷酸转移酶活性。缺失BRCT基序的POLβ2突变株保持了较高的聚合酶活性,而突变株POLβ2在DNA聚合酶活性部位有两个丙氨酸点突变则没有。这些结果表明,POLβ2是一种与POLβ相关的DNA聚合酶,其BRCT基序对于其聚合酶活性是必不可少的。
The BRCA1 COOH terminus (BRCT) motif is present in many nuclear proteins that contribute to cell cycle regulation or DNA repair. Polymerase chain reaction-based screening with degenerate primers targeted to the BRCT motif resulted in the isolation of a human cDNA for a previously unidentified DNA polymerase (designated DNA polymerase β2) that is closely related to DNA polymerase β (Pol β). The predicted Pol β2 protein contains a BRCT motif in its NH2-terminal region; its COOH-terminal region exhibits 33% sequence identity to a corresponding region of human Pol β. The Pol β2 gene is expressed in a tissue-specific manner, with transcripts being most abundant in testis. A fusion construct comprising Pol β2 and green fluorescent protein exhibited a predominantly nuclear localization in transfected HeLa cells. Recombinant human Pol β2 from insect cells exhibited substantial DNA polymerase activity, but it did not possess terminal deoxyribonucleotidyl transferase activity. A truncated Pol β2 mutant lacking the BRCT motif retained substantial DNA polymerase activity, whereas a mutant Pol β2 with two alanine point mutations within the DNA polymerase active site did not. These results indicate that Pol β2 is a Pol β-related DNA polymerase with a BRCT motif that is dispensable for its polymerase activity.
DOI: 10.1093/nar/23.19.3810
发表时间: 1995-10-11
影响因子: 14.9
作者:
HORTON, JK;SRIVASTAVA, DK;WILSON, SH
通讯作者: WILSON, SH
DNA聚合酶抑制剂对完整且可渗透的人成纤维细胞DNA修复的影响:证据表明DNA聚合酶δ和β参与N-甲基-N-硝基-N-亚硝基胍诱导的DNA修复合成。
DOI: 10.1021/bi00453a039
发表时间: 1990
期刊: Biochemistry
影响因子: 2.9
作者:
Hammond,RA;McClung,JK;Miller,MR
通讯作者: Miller,MR
DOI: 10.1126/science.7516580
发表时间: 1994-06-24
期刊: SCIENCE
影响因子: 56.9
作者:
PELLETIER, H;SAWAYA, MR;KRAUT, J
通讯作者: KRAUT, J
叙利亚仓鼠雌激素诱导肾肿瘤的 DNA 聚合酶 β mRNA 突变。
DOI: --
发表时间: 1995
期刊: Biochemistry and molecular biology international.
影响因子: --
作者:
Yan,ZJ;Roy,D
通讯作者: Roy,D
DOI: 10.1128/mcb.10.7.3289-3296.1990
发表时间: 1990
影响因子: 5.3
作者:
Chang,CD;Ottavio,L;Travali,S;Lipson,KE;Baserga,R
通讯作者: Baserga,R