Target name

P27695: DNA-(apurinic or apyrimidinic site) lyase

  Protein function

Multifunctional protein that plays a central role in the cellular response to oxidative stress. The two major activities of APEX1 in DNA repair and redox regulation of transcriptional factors. Functions as a apurinic/apyrimidinic (AP) endodeoxyribonuclease in the DNA base excision repair (BER) pathway of DNA lesions induced by oxidative and alkylating agents. Initiates repair of AP sites in DNA by catalyzing hydrolytic incision of the phosphodiester backbone immediately adjacent to the damage, generating a single-strand break with 5'-deoxyribose phosphate and 3'-hydroxyl ends. Does also incise at AP sites in the DNA strand of DNA/RNA hybrids, single-stranded DNA regions of R-loop structures, and single-stranded RNA molecules. Has a 3'-5' exoribonuclease activity on mismatched deoxyribonucleotides at the 3' termini of nicked or gapped DNA molecules during short-patch BER. Possesses a DNA 3' phosphodiesterase activity capable of removing lesions (such as phosphoglycolate) blocking the 3' side of DNA strand breaks. May also play a role in the epigenetic regulation of gene expression by participating in DNA demethylation. Acts as a loading factor for POLB onto non-incised AP sites in DNA and stimulates the 5'-terminal deoxyribose 5'-phosphate (dRp) excision activity of POLB. Plays a role in the protection from granzymes-mediated cellular repair leading to cell death. Also involved in the DNA cleavage step of class switch recombination (CSR). On the other hand, APEX1 also exerts reversible nuclear redox activity to regulate DNA binding affinity and transcriptional activity of transcriptional factors by controlling the redox status of their DNA-binding domain, such as the FOS/JUN AP-1 complex after exposure to IR. Involved in calcium-dependent down-regulation of parathyroid hormone (PTH) expression by binding to negative calcium response elements (nCaREs). Together with HNRNPL or the dimer XRCC5/XRCC6, associates with nCaRE, acting as an activator of transcriptional repression. Stimulates the YBX1-mediated MDR1 promoter activity, when acetylated at Lys-6 and Lys-7, leading to drug resistance. Acts also as an endoribonuclease involved in the control of single-stranded RNA metabolism. Plays a role in regulating MYC mRNA turnover by preferentially cleaving in between UA and CA dinucleotides of the MYC coding region determinant (CRD). In association with NMD1, plays a role in the rRNA quality control process during cell cycle progression. Associates, together with YBX1, on the MDR1 promoter. Together with NPM1, associates with rRNA. Binds DNA and RNA.

  Database links

Uniprot primary ID P27695
DrugBank ID DB04967
BioGrid ID 106825
PharmGKB ID PA201059
KEGG ID hsa:328
Entrez Gene (Gene ID) 328
STRING 9606ENSP00000216714
MINT MINT-119189
IntAct P27695
DMDM 113984
BREDNA 429918
Rectome R-HSA-110357 R-HSA-174414 R-HSA-5651801 R-HSA-73933 R-HSA-73930 R-HSA-110362 R-HSA-110373 R-HSA-69183
BindingDB P27695

  Model Performance Metrics

Fingerprint type F1_CV AUC_CV Accuracy_CV Sensitivity_CV Specificity_CV F1_test AUC_test Accuracy_test Sensitivity_test Specificity_test Download model
FP2 fingerprints 0.604 0.731 0.691 0.792 0.648 0.650 0.669 0.689 0.813 0.621 Download
MACCS fingerprints 0.563 0.809 0.685 0.679 0.688 0.579 0.765 0.644 0.688 0.621 Download
Daylight fingerprints 0.607 0.734 0.680 0.830 0.616 0.696 0.744 0.689 1.000 0.517 Download
ECFP2 fingerprints 0.000 0.347 0.652 0.000 0.928 0.118 0.682 0.667 0.063 1.000 Download
ECFP4 fingerprints 0.157 0.597 0.579 0.132 0.768 0.552 0.813 0.711 0.500 0.828 Download
ECFP6 fingerprints 0.446 0.674 0.624 0.509 0.672 0.649 0.839 0.711 0.750 0.690 Download

  Download datasets

Positive dataset Negative dataset

Copyright @ 2012-2014 Computational Biology & Drug Design Group,
School of Pharmaceutical Sciences, Central South University. All rights reserved.

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