scholarly journals FANCJ (BACH1) helicase forms DNA damage inducible foci with replication protein A and interacts physically and functionally with the single-stranded DNA-binding protein

Blood ◽  
2007 ◽  
Vol 110 (7) ◽  
pp. 2390-2398 ◽  
Author(s):  
Rigu Gupta ◽  
Sudha Sharma ◽  
Joshua A. Sommers ◽  
Mark K. Kenny ◽  
Sharon B. Cantor ◽  
...  
Keyword(s):  
Dna Damage ◽  
Dna Binding ◽  
Binding Protein ◽  
Critical Role ◽  
Protein A ◽  
Replication Protein A ◽  
Dna Binding Protein ◽  
Replication Protein ◽  
Single Stranded Dna

The BRCA1 associated C-terminal helicase (BACH1, designated FANCJ) is implicated in the chromosomal instability genetic disorder Fanconi anemia (FA) and hereditary breast cancer. A critical role of FANCJ helicase may be to restart replication as a component of downstream events that occur during the repair of DNA cross-links or double-strand breaks. We investigated the potential interaction of FANCJ with replication protein A (RPA), a single-stranded DNA-binding protein implicated in both DNA replication and repair. FANCJ and RPA were shown to coimmunoprecipitate most likely through a direct interaction of FANCJ and the RPA70 subunit. Moreover, dependent on the presence of BRCA1, FANCJ colocalizes with RPA in nuclear foci after DNA damage. Our data are consistent with a model in which FANCJ associates with RPA in a DNA damage-inducible manner and through the protein interaction RPA stimulates FANCJ helicase to better unwind duplex DNA substrates. These findings identify RPA as the first regulatory partner of FANCJ. The FANCJ-RPA interaction is likely to be important for the role of the helicase to more efficiently unwind DNA repair intermediates to maintain genomic stability.

scholarly journals Complex formation between p53 and replication protein A inhibits the sequence-specific DNA binding of p53 and is regulated by single-stranded DNA.

1997 ◽  
Vol 17 (4) ◽  
pp. 2194-2201 ◽  
Author(s):  
S D Miller ◽  
K Moses ◽  
L Jayaraman ◽  
C Prives
Keyword(s):  
Dna Binding ◽  
Complex Formation ◽  
Binding Protein ◽  
Protein A ◽  
Replication Protein A ◽  
Dna Binding Protein ◽  
Replication Protein ◽  
Single Stranded Dna ◽  
C Terminus ◽  
P53 Response

Human replication protein A (RP-A) (also known as human single-stranded DNA binding protein, or HSSB) is a multisubunit complex involved in both DNA replication and repair. Potentially important to both these functions, it is also capable of complex formation with the tumor suppressor protein p53. Here we show that although p53 is unable to prevent RP-A from associating with a range of single-stranded DNAs in solution, RP-A is able to strongly inhibit p53 from functioning as a sequence-specific DNA binding protein when the two proteins are complexed. This inhibition, in turn, can be regulated by the presence of various lengths of single-stranded DNAs, as RP-A, when bound to these single-stranded DNAs, is unable to interact with p53. Interestingly, the lengths of single-stranded DNA capable of relieving complex formation between the two proteins represent forms that might be introduced through repair and replicative events. Increasing p53 concentrations can also overcome the inhibition by steady-state levels of RP-A, potentially mimicking cellular points of balance. Finally, it has been shown previously that p53 can itself be stimulated for site-specific DNA binding when complexed through the C terminus with short single strands of DNA, and here we show that p53 stays bound to these short strands even after binding a physiologically relevant site. These results identify a potential dual role for single-stranded DNA in the regulation of DNA binding by p53 and give insights into the p53 response to DNA damage.

scholarly journals Rpa4, a homolog of the 34-kilodalton subunit of the replication protein A complex.

1995 ◽  
Vol 15 (6) ◽  
pp. 3119-3128 ◽  
Author(s):  
K F Keshav ◽  
C Chen ◽  
A Dutta
Keyword(s):  
Dna Binding ◽  
Blot Analysis ◽  
Binding Protein ◽  
Protein A ◽  
Simian Virus 40 ◽  
Replication Protein A ◽  
Dna Binding Protein ◽  
Replication Protein ◽  
Proliferating Cells ◽  
Single Stranded Dna

Replication protein A (RPA) is a complex of three polypeptides of 70, 34, and 13 kDa isolated from diverse eukaryotes. The complex is a single-stranded DNA-binding protein essential for simian virus 40-based DNA replication in vitro and for viability in the yeast Saccharomyces cerevisiae. We have identified a new 30-kDa human protein which interacts with the 70- and 13-kDa subunits of RPA, with a yeast two-hybrid/interaction trap method. This protein, Rpa4, has 47% identity with Rpa2, the 34-kDa subunit of RPA. Rpa4 associates with the 70- and 13-kDa subunits to form a trimeric complex capable of binding to single-stranded DNA. Rpa4 is preferentially expressed in placental and colon mucosa tissues. In the placenta, Rpa4 is more abundant than the 70-kDa Rpa1 subunit and is not associated with either Rpa1 or with any other single-stranded DNA-binding protein. In proliferating cells in culture, Rpa4 is considerably less abundant than Rpa1 and Rpa2. Northern (RNA) blot analysis suggest that there are alternatively processed forms of the RPA4 mRNA, and Southern blot analysis indicates that beside RPA4 there may be other members of the RPA2 gene family.

scholarly journals Replication Protein A-Directed Unloading of PCNA by the Ctf18 Cohesion Establishment Complex

2005 ◽  
Vol 25 (13) ◽  
pp. 5445-5455 ◽  
Author(s):  
Göran O. Bylund ◽  
Peter M. J. Burgers
Keyword(s):  
Dna Replication ◽  
Dna Binding ◽  
Sister Chromatid ◽  
Protein A ◽  
Replication Protein A ◽  
Dna Binding Protein ◽  
Sister Chromatid Cohesion ◽  
Replication Protein ◽  
Single Stranded Dna ◽  
Chromatid Cohesion

ABSTRACT The replication clamp PCNA is loaded around DNA by replication factor C (RFC) and functions in DNA replication and repair. Regulated unloading of PCNA during the progression and termination of DNA replication may require additional factors. Here we show that a Saccharomyces cerevisiae complex required for the establishment of sister chromatid cohesion functions as an efficient unloader of PCNA. Unloading requires ATP hydrolysis. This seven-subunit Ctf18-RFC complex consists of the four small subunits of RFC, together with Ctf18, Dcc1, and Ctf8. Ctf18-RFC was also a weak loader of PCNA onto naked template-primer DNA. However, when the single-stranded DNA template was coated by the yeast single-stranded DNA binding protein replication protein A (RPA) but not by a mutant form of RPA or a heterologous single-stranded DNA binding protein, both binding of Ctf18-RFC to substrate DNA and loading of PCNA were strongly inhibited, and unloading predominated. Neither yeast RFC itself nor two other related clamp loaders, containing either Rad24 or Elg1, catalyzed significant unloading of PCNA. The Dcc1 and Ctf8 subunits of Ctf18-RFC, while required for establishing sister chromatid cohesion in vivo, did not function specifically in PCNA unloading in vitro, thereby separating the functionality of the Ctf18-RFC complex into two distinct paths.

scholarly journals Damaged DNA-binding Protein DDB Stimulates the Excision of Cyclobutane Pyrimidine Dimersin Vitroin Concert with XPA and Replication Protein A

2001 ◽  
Vol 276 (18) ◽  
pp. 15434-15440 ◽  
Author(s):  
Mitsuo Wakasugi ◽  
Mayuko Shimizu ◽  
Hiroshi Morioka ◽  
Stuart Linn ◽  
Osamu Nikaido ◽  
...  
Keyword(s):  
Dna Binding ◽  
Binding Protein ◽  
Protein A ◽  
Replication Protein A ◽  
Dna Binding Protein ◽  
Replication Protein ◽  
Damaged Dna

scholarly journals Role of Replication Protein A in Double Holliday Junction Dissolution Mediated by the BLM-Topo IIIα-RMI1-RMI2 Protein Complex

2013 ◽  
Vol 288 (20) ◽  
pp. 14221-14227 ◽  
Author(s):  
Xiaoyu Xue ◽  
Steven Raynard ◽  
Valeria Busygina ◽  
Akhilesh K. Singh ◽  
Patrick Sung
Keyword(s):  
Protein A ◽  
Replication Protein A ◽  
Dna Binding Protein ◽  
Replication Protein ◽  
Holliday Junction ◽  
Interaction Domain ◽  
Single Stranded Dna ◽  
Dissolution Reaction ◽  
Double Holliday Junction

The conserved BTR complex, composed of the Bloom's syndrome helicase (BLM), topoisomerase IIIα, RMI1, and RMI2, regulates homologous recombination in favor of non-crossover formation via the dissolution of the double Holliday Junction (dHJ). Here we show enhancement of the BTR-mediated dHJ dissolution reaction by the heterotrimeric single-stranded DNA binding protein replication protein A (RPA). Our results suggest that RPA acts by sequestering a single-stranded DNA intermediate during dHJ dissolution. We provide evidence that RPA physically interacts with RMI1. The RPA interaction domain in RMI1 has been mapped, and RMI1 mutants impaired for RPA interaction have been generated. Examination of these mutants ascertains the significance of the RMI1-RPA interaction in dHJ dissolution. Our results thus implicate RPA as a cofactor of the BTR complex in dHJ dissolution.

scholarly journals The RPA32 Subunit of Human Replication Protein A Contains a Single-stranded DNA-binding Domain

1998 ◽  
Vol 273 (7) ◽  
pp. 3932-3936 ◽  
Author(s):  
Elena Bochkareva ◽  
Lori Frappier ◽  
Aled M. Edwards ◽  
Alexey Bochkarev
Keyword(s):  
Dna Binding ◽  
Protein A ◽  
Replication Protein A ◽  
Binding Domain ◽  
Replication Protein ◽  
Dna Binding Domain ◽  
Single Stranded Dna
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