GO:0072571 mono-ADP-D-ribose binding: Mechanism & Genes

Mono-ADP-D-ribose binding (GO:0072571) is a molecular function that enables a protein to selectively interact with monomeric ADP-D-ribose, a metabolite generated during cellular processes such as NAD+ metabolism and ADP-ribosylation reactions. This binding event is critical for decoding signals carried by mono-ADP-ribose moieties attached to target proteins or present as free molecules. Understanding this function is essential because it underlies diverse physiological and pathological processes, including DNA repair, transcriptional regulation, and immune responses. Researchers studying this term aim to identify the specific protein domains and structural features that confer binding specificity, as well as the downstream consequences of these interactions. The availability of CRISPR-based tools has revolutionized the ability to dissect the roles of mono-ADP-D-ribose-binding proteins in health and disease.

According to the Gene Ontology, GO:0072571 mono-ADP-D-ribose binding is defined as the binding to monomeric ADP-D-ribose, an ADP-aldose having ribose as the aldose fragment. This function is distinct from poly-ADP-ribose binding and from the enzymatic activity of ADP-ribosyltransferases. Proteins annotated with this term typically contain specialized domains, such as macrodomains or PARP catalytic domains, that recognize the mono-ADP-ribose moiety with high specificity.

Mono-ADP-D-ribose binding is important because it serves as a key molecular recognition event in cellular signaling pathways that regulate DNA repair, cell death, and immune responses. Dysregulation of this binding activity has been linked to cancer progression, neurodegenerative disorders, and inflammatory diseases, making it a potential therapeutic target. Furthermore, understanding the structural basis of mono-ADP-D-ribose binding can inform the design of inhibitors that selectively modulate these interactions.

The following genes encode proteins that have been reported to bind mono-ADP-D-ribose or contain domains associated with this activity.

The binding of mono-ADP-D-ribose is regulated at multiple levels, including the availability of the ligand, which is controlled by enzymes that synthesize and degrade ADP-ribose. Additionally, post-translational modifications of the binding proteins, such as phosphorylation and acetylation, can alter their affinity for mono-ADP-ribose. Cellular stress conditions, including oxidative stress and DNA damage, can increase the production of mono-ADP-ribose and enhance binding to target proteins.

Mono-ADP-D-ribose binding proteins such as PARP1 and MACROD2 are frequently dysregulated in cancers, contributing to genomic instability and chemoresistance. Inhibitors targeting these proteins have shown efficacy in clinical trials for breast and ovarian cancers.

Mutations in ADPRHL2, which regulates mono-ADP-ribose levels, cause neurodegenerative disorders characterized by progressive brain atrophy. Dysfunctional mono-ADP-ribose binding may also contribute to Alzheimer's and Parkinson's diseases.

PARP9 and PARP14, which bind mono-ADP-ribose, play roles in macrophage activation and inflammatory cytokine production, linking this binding activity to autoimmune and inflammatory conditions.

Recombinant proteins or cell lysates can be used in pull-down assays with biotinylated mono-ADP-ribose or in isothermal titration calorimetry to measure binding affinity. These methods provide quantitative data on the interaction.

X-ray crystallography and cryo-electron microscopy can resolve the atomic details of the binding pocket and reveal conformational changes upon ligand binding. These structures guide the design of inhibitors.

Genome-wide CRISPR knockout or activation screens can identify genes that modulate mono-ADP-D-ribose binding or its downstream effects. Such screens are powerful for discovering novel regulators.

Affinity purification coupled with mass spectrometry can identify proteins that interact with mono-ADP-ribose-binding proteins, revealing signaling complexes. This approach helps map the broader interaction network.

Researchers studying mono-ADP-D-ribose binding-related genes often need to determine whether a candidate gene is causally involved in a specific cellular process or disease. EDITGENE provides a comprehensive suite of CRISPR-based services to enable such investigations with high precision and efficiency.

Mono-ADP-D-ribose binding (GO:0072571) is a fundamental molecular function that governs critical cellular processes, from DNA repair to immune signaling. Its dysregulation is implicated in major human diseases, making it a compelling target for therapeutic intervention. Leveraging CRISPR-based models and EDITGENE's comprehensive services will accelerate discoveries in this field.