Affinity purification and partial characterization of a yeast multiprotein complex for nucleotide excision repair using histidine-tagged Rad14 protein

被引:19
作者
Rodriguez, K
Talamantez, J
Huang, W
Reed, SH
Wang, Z
Chen, L
Feaver, WJ
Friedberg, EC
Tomkinson, AE
机构
[1] Univ Texas, Hlth Sci Ctr, Inst Biotechnol, Dept Mol Med, San Antonio, TX 78245 USA
[2] Univ Texas, SW Med Ctr, Dept Pathol, Lab Mol Pathol, San Antonio, TX 78245 USA
[3] Univ Kentucky, Grad Ctr Toxicol, Lexington, KY 40536 USA
关键词
D O I
10.1074/jbc.273.51.34180
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The nucleotide excision repair (NER) pathway of eukaryotes involves similar to 30 polypeptides. Reconstitution of this pathway with purified components is consistent with the sequential assembly of NER proteins at the DNA lesion. However, recent studies have suggested that NER proteins may be pre-assembled in a high molecular weight complex in the absence of DNA damage. To examine this model further, we have constructed a histidine-tagged version of the yeast DNA damage recognition protein Rad14. Affinity purification of this protein from yeast nuclear extracts resulted in the co-purification of Rad1, Rad7, Rad10, Rad16, Rad23, RPA, RPB1, and TFIIH proteins, whereas none of these proteins bound to the affinity resin in the absence of recombinant Rad14. Furthermore, many of the co-purifying proteins were present in approximately equimolar amounts. Co-elution of these proteins was also observed when the nuclear extract was fractionated by gel filtration, indicating that the NER proteins were associated in a complex with a molecular mass of >1000 kDa prior to affinity chromatography. The affinity purified NER complex catalyzed the incision of W-irradiated DNA in an ATP-dependent reaction, We conclude that active high molecular weight complexes of NER proteins exist in undamaged yeast cells.
引用
收藏
页码:34180 / 34189
页数:10
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