PARP/PARPTrap™ Screening & Profiling

PARP (Poly ADP-Ribose Polymerase) proteins are a large family of 17 members that catalyze the ADP-ribosylation of proteins and DNA. PARPs are part of a network of 150 proteins involved in the DNA damage response, which constantly scan and repair DNA to maintain genome integrity. The PARP proteins are involved in a wide range of biological functions: DNA repair, chromatin remodeling, mitotic spindle assembly, regulation of RNA turnover, regulation of gene expression, apoptosis, and more.

Accelerate your drug discovery and development projects using PARP or PARPtrap™ screening services. We offer the largest PARP proteins panel on the market, allowing you to compare efficacy across our entire PARP family.

Enzymatic Activity by ELISA

ELISA: Histone proteins are coated on a plate. Biotin-labeled NAD+ is added with the PARP enzyme. PARP-mediated ribosylation activity is detected by adding Streptavidin-HRP (horseradish peroxidase), which binds to the newly formed ribosylation branch, and a chemiluminescent or colorimetric HRP substrate.

PARP Trapping

Fluorescence Polarization Assay: The assay uses fluorescent DNA probes that emit differently polarized light depending on PARP binding. Addition of a PARP inhibitor prevents ribosylation and results in the trapping of PARP onto the fluorescent oligonucleotide duplex, which increases the Fluorescence Polarization signal in a dose dependent manner. This is a homogeneous assay.