Product: RPA1 Antibody
Catalog: DF6172
Source: Rabbit
Application: WB, IHC, IF/ICC, ELISA(peptide)
Reactivity: Human, Mouse, Rat
Prediction: Pig, Bovine, Horse, Sheep, Rabbit, Dog, Chicken, Xenopus
Mol.Wt.: 68kD; 68kD(Calculated).
Uniprot: P27694
RRID: AB_2838139

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 100ul $280 In stock
 200ul $350 In stock

Lead Time: Same day delivery

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Product Info

WB 1:500-1:2000, IHC 1:50-1:200, IF/ICC 1:100-1:500, ELISA(peptide) 1:20000-1:40000
*The optimal dilutions should be determined by the end user.

WB: For western blot detection of denatured protein samples. IHC: For immunohistochemical detection of paraffin sections (IHC-p) or frozen sections (IHC-f) of tissue samples. IF/ICC: For immunofluorescence detection of cell samples. ELISA(peptide): For ELISA detection of antigenic peptide.

Pig(92%), Bovine(92%), Horse(85%), Sheep(92%), Rabbit(92%), Dog(85%), Chicken(85%), Xenopus(92%)
RPA1 Antibody detects endogenous levels of total RPA1.
Cite Format: Affinity Biosciences Cat# DF6172, RRID:AB_2838139.
The antiserum was purified by peptide affinity chromatography using SulfoLink™ Coupling Resin (Thermo Fisher Scientific).
Rabbit IgG in phosphate buffered saline , pH 7.4, 150mM NaCl, 0.02% sodium azide and 50% glycerol. Store at -20 °C. Stable for 12 months from date of receipt.


Dmrpa1; Drosophila Replication Protein A; DRPA; HSSB; Human single stranded DNA binding protein; MST075; MSTP075; p70; REPA1; Replication factor A; Replication factor A protein 1; Replication protein A 70 kDa DNA-binding subunit; Replication protein A 70kDa DNA binding subunit; Replication protein A1 70kDa; Replication protein A1; RF A; RF-A protein 1; RFA; RFA1_HUMAN; RP A; RP-A p70; RPA 70; RPA; rpa1; Single stranded binding protein 70; Single-stranded DNA-binding protein;


RPA70 (HSSB, REPA1, RF-A, RP-A, p70) is a component of a heterotrimeric complex, composed of 70, 32/30 and 14 kDa subunits, collectively known as RPA. RPA is a single stranded DNA binding protein, whose DNA binding activity is believed to reside entirely in the 70 kDa subunit. The complex is required for almost all aspects of cellular DNA metabolism such as DNA replication (1-3), recombination, cell cycle and DNA damage checkpoints, and all major types of DNA repair including nucleotide excision, base excision, mismatch and double-strand break repairs (4-7). In response to genotoxic stress in eukaryotic cells, RPA has been shown to associate with the Rad9/Rad1/Hus1 (9-1-1) checkpoint complex (8). RPA is hyperphosphorylated upon DNA damage or replication stress by checkpoint kinases including ataxia telangiectasia mutated (ATM), ATM and Rad3-related (ATR), and DNA-dependent protein kinase (DNA-PK) (9-11). Hyperphosphorylation may alter RPA-DNA and RPA-protein interactions. In addition to the checkpoint partners, RPA interacts with a wide variety of protein partners, including proteins required for normal replication such as RCF, PCNA and Pol α, and also proteins involved in SV40 replication, such as DNA polymerase I and SV40 large T antigen (10,12).



Score>80(red) has high confidence and is suggested to be used for WB detection. *The prediction model is mainly based on the alignment of immunogen sequences, the results are for reference only, not as the basis of quality assurance.

Model Confidence:
High(score>80) Medium(80>score>50) Low(score<50) No confidence

PTMs - P27694 As Substrate

Site PTM Type Enzyme
M1 Acetylation
S6 Phosphorylation
K22 Ubiquitination
T35 Phosphorylation
S38 Phosphorylation
K88 Ubiquitination
K111 Sumoylation
K111 Ubiquitination
S135 Phosphorylation
K157 Ubiquitination
K163 Acetylation
K163 Methylation
K163 Ubiquitination
T164 Phosphorylation
K167 Acetylation
K167 Methylation
K167 Sumoylation
K167 Ubiquitination
S174 Phosphorylation
S177 Phosphorylation
T180 Phosphorylation
S182 Phosphorylation
K183 Ubiquitination
T191 Phosphorylation
S195 Phosphorylation
K196 Acetylation
K196 Ubiquitination
S207 Phosphorylation
R210 Methylation
K220 Ubiquitination
K244 Ubiquitination
K259 Acetylation
K259 Ubiquitination
K263 Ubiquitination
K267 Acetylation
K267 Ubiquitination
S312 Phosphorylation
K313 Ubiquitination
S315 Phosphorylation
K324 Ubiquitination
K331 Ubiquitination
K367 Ubiquitination
K379 Ubiquitination
S384 Phosphorylation
S392 Phosphorylation
K410 Ubiquitination
K431 Ubiquitination
S432 Phosphorylation
K443 Methylation
K443 Ubiquitination
K449 Sumoylation
K458 Ubiquitination
Y461 Phosphorylation
S463 Phosphorylation
S464 Phosphorylation
T467 Phosphorylation
Y470 Phosphorylation
K473 Ubiquitination
Y478 Phosphorylation
T483 Phosphorylation
K488 Ubiquitination
K489 Acetylation
K489 Sumoylation
K489 Ubiquitination
K502 Acetylation
K502 Ubiquitination
K511 Ubiquitination
K553 Ubiquitination
K577 Acetylation
K577 Sumoylation
K577 Ubiquitination
Y581 Phosphorylation
K588 Ubiquitination
T590 Phosphorylation
K595 Sumoylation
K595 Ubiquitination
Y599 Phosphorylation

Research Backgrounds


As part of the heterotrimeric replication protein A complex (RPA/RP-A), binds and stabilizes single-stranded DNA intermediates, that form during DNA replication or upon DNA stress. It prevents their reannealing and in parallel, recruits and activates different proteins and complexes involved in DNA metabolism. Thereby, it plays an essential role both in DNA replication and the cellular response to DNA damage. In the cellular response to DNA damage, the RPA complex controls DNA repair and DNA damage checkpoint activation. Through recruitment of ATRIP activates the ATR kinase a master regulator of the DNA damage response. It is required for the recruitment of the DNA double-strand break repair factors RAD51 and RAD52 to chromatin in response to DNA damage. Also recruits to sites of DNA damage proteins like XPA and XPG that are involved in nucleotide excision repair and is required for this mechanism of DNA repair. Plays also a role in base excision repair (BER) probably through interaction with UNG. Also recruits SMARCAL1/HARP, which is involved in replication fork restart, to sites of DNA damage. May also play a role in telomere maintenance. As part of the alternative replication protein A complex, aRPA, binds single-stranded DNA and probably plays a role in DNA repair. Compared to the RPA2-containing, canonical RPA complex, may not support chromosomal DNA replication and cell cycle progression through S-phase. The aRPA may not promote efficient priming by DNA polymerase alpha but could support DNA synthesis by polymerase delta in presence of PCNA and replication factor C (RFC), the dual incision/excision reaction of nucleotide excision repair and RAD51-dependent strand exchange.


DNA damage-induced 'Lys-63'-linked polyubiquitination by PRPF19 mediates ATRIP recruitment to the RPA complex at sites of DNA damage and activation of ATR. Ubiquitinated by RFWD3 at stalled replication forks in response to DNA damage: ubiquitination by RFWD3 does not lead to degradation by the proteasome and promotes removal of the RPA complex from stalled replication forks, promoting homologous recombination.

Sumoylated on lysine residues Lys-449 and Lys-577, with Lys-449 being the major site. Sumoylation promotes recruitment of RAD51 to the DNA damage foci to initiate DNA repair through homologous recombination. Desumoylated by SENP6.

Subcellular Location:

Nucleus. Nucleus>PML body.
Note: Enriched in PML bodies in cells displaying alternative lengthening of their telomeres.

Extracellular region or secreted Cytosol Plasma membrane Cytoskeleton Lysosome Endosome Peroxisome ER Golgi apparatus Nucleus Mitochondrion Manual annotation Automatic computational assertionSubcellular location
Subunit Structure:

Component of the canonical replication protein A complex (RPA), a heterotrimer composed of RPA1, RPA2 and RPA3. Also component of the aRPA, the alternative replication protein A complex, a trimeric complex similar to the replication protein A complex/RPA but where RPA1 and RPA3 are associated with RPA4 instead of RPA2. The DNA-binding activity may reside exclusively on the RPA1 subunit. Interacts with PRPF19; the PRP19-CDC5L complex is recruited to the sites of DNA repair where it ubiquitinates the replication protein A complex (RPA). Interacts with RIPK1. Interacts with the polymerase alpha subunit POLA1/p180; this interaction stabilizes the replicative complex and reduces the misincorporation rate of DNA polymerase alpha by acting as a fidelity clamp. Interacts with RAD51 and SENP6 to regulate DNA repair. Interacts with HELB; this interaction promotes HELB recruitment to chromatin following DNA damage. Interacts with PRIMPOL; leading to recruit PRIMPOL on chromatin and stimulate its DNA primase activity. Interacts with XPA; the interaction is direct and associates XPA with the RPA complex. Interacts with ETAA1; the interaction is direct and promotes ETAA1 recruitment at stalled replication forks.


Belongs to the replication factor A protein 1 family.

Research Fields

· Genetic Information Processing > Replication and repair > DNA replication.

· Genetic Information Processing > Replication and repair > Nucleotide excision repair.

· Genetic Information Processing > Replication and repair > Mismatch repair.

· Genetic Information Processing > Replication and repair > Homologous recombination.

· Genetic Information Processing > Replication and repair > Fanconi anemia pathway.

Restrictive clause


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