Protein phosphatase 1 regulatory subunit 3B (172-180)

Protein phosphatase 1 regulatory subunit 3B (172-180) is a synthetic peptide fragment derived from the regulatory subunit 3B of protein phosphatase 1 (PP1), a key serine/threonine phosphatase involved in diverse cellular signaling pathways. This peptide encompasses amino acids 172 to 180 of the parent protein, representing a region that is functionally significant in mediating interactions with PP1 and modulating its activity. As a research tool, the fragment provides valuable insight into the molecular mechanisms governing glycogen metabolism, signal transduction, and the regulation of phosphatase complexes. Its defined sequence and biochemical properties make it an important resource for studies aiming to dissect the functional domains of PP1 regulatory subunits and their role in cellular homeostasis.

Peptide-Protein Interaction Studies: The 172-180 fragment is widely utilized in investigations that focus on mapping interaction motifs between regulatory subunits and the PP1 catalytic core. By incorporating this peptide in binding assays, researchers can characterize the affinity and specificity of PP1-subunit associations, elucidate consensus docking sequences, and identify critical residues responsible for regulatory control. Such studies are essential for understanding the structural basis of PP1 holoenzyme assembly and for the development of molecular probes targeting phosphatase complexes.

Signal Transduction Research: As a representative segment of a regulatory subunit, this peptide serves as a model system for probing the modulation of protein phosphatase activity within signaling networks. Experimental use of the fragment in kinase or phosphatase assays enables the assessment of its influence on substrate dephosphorylation, providing mechanistic insight into how regulatory subunits modulate signal flow in pathways such as glycogen metabolism and cell cycle progression. These findings contribute to a deeper understanding of phosphorylation dynamics and the fine-tuning of cellular responses.

Phosphorylation Site Analysis: The defined sequence of the 172-180 peptide allows for targeted studies of post-translational modifications, particularly site-specific phosphorylation. By serving as a substrate in in vitro kinase assays, the peptide enables precise mapping of phosphorylation events and facilitates the identification of kinases responsible for modifying regulatory subunits. This application is crucial for unraveling the interplay between phosphorylation and phosphatase regulation, supporting efforts to decode signaling hierarchies and feedback mechanisms.

Antibody Generation and Validation: The unique epitope represented by this peptide fragment is often employed as an immunogen for the production of sequence-specific antibodies. Such antibodies are valuable tools for the detection, quantification, and localization of the parent regulatory subunit in various biological samples. In addition, the peptide can be used to validate antibody specificity in immunoassays, ensuring reliable interpretation of experimental results in studies involving PP1 regulatory subunits.

Peptide-Based Inhibitor Design: The structural and functional attributes of the 172-180 sequence are leveraged in the rational design of peptide-based inhibitors targeting PP1-subunit interactions. By mimicking key binding motifs, synthetic derivatives of this fragment can serve as competitive inhibitors in biochemical assays, aiding in the dissection of regulatory mechanisms and the identification of potential lead compounds for further development. This approach supports the broader objective of modulating phosphatase activity for research into cellular regulation and enzyme control.

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