Plasminogen activator inhibitor 1 RNA-binding protein
CGI-55 protein (21-31) is a synthetic peptide fragment derived from the central region of the CGI-55 protein, also known as Small Nuclear Ribonucleoprotein Polypeptide F Interacting Protein 1 (SNFIP1). As a defined peptide sequence, it represents amino acids 21 through 31 of the parent protein, offering a focused tool for dissecting the structure-function relationships within CGI-55. This peptide is of significant interest in biochemical and molecular biology research, particularly in studies involving protein-protein interactions, post-translational modifications, and the functional mapping of peptide motifs within larger protein frameworks. Its accessibility as a well-characterized fragment enables precise experimental manipulation in a range of peptide-based investigations.
Protein-protein interaction studies: The 21-31 fragment of CGI-55 serves as a valuable probe for elucidating the specific binding interfaces and interaction motifs of the parent protein. Researchers employ this peptide in in vitro binding assays, such as surface plasmon resonance or pull-down experiments, to map interaction partners and determine the molecular determinants of CGI-55-mediated complexes. By isolating this defined region, it becomes possible to pinpoint critical residues responsible for recognition events, thereby advancing understanding of the protein's role in cellular signaling or RNA processing pathways.
Epitope mapping and antibody development: The synthetic peptide corresponding to residues 21-31 is frequently utilized as an antigenic determinant for the generation and characterization of site-specific antibodies against CGI-55. Its defined sequence allows for the production of polyclonal or monoclonal antibodies that specifically recognize this region, facilitating immunodetection, immunoprecipitation, or immunofluorescence studies. Such antibodies are instrumental in localizing the parent protein within cellular compartments and in monitoring its expression dynamics under various experimental conditions.
Peptide-functional studies: As a discrete segment of the CGI-55 protein, the 21-31 peptide is employed in functional assays to investigate the biological activity associated with this motif. Incorporation into cell-based assays or biochemical reconstitution systems enables the assessment of its influence on processes such as RNA splicing, nuclear transport, or protein assembly. By comparing the effects of the peptide with those of the full-length protein or other fragments, researchers can delineate the contribution of this specific region to the overall function of CGI-55.
Structural and conformational analysis: The defined 21-31 sequence is amenable to a variety of structural biology techniques, including nuclear magnetic resonance (NMR) spectroscopy and circular dichroism (CD) analysis. These studies provide insights into the secondary structure propensity, flexibility, and conformational dynamics of the peptide, both in isolation and in the context of binding partners. Such structural information is critical for rationalizing the molecular basis of CGI-55's activity and for guiding the design of modified peptides with altered properties.
Peptide synthesis and analytical method development: The availability of the CGI-55 (21-31) peptide supports method development in synthetic peptide chemistry and analytical validation. It is often used as a standard or reference material for optimizing solid-phase peptide synthesis protocols, evaluating chromatographic separation techniques, or calibrating mass spectrometry instrumentation. Its defined composition and sequence-specific properties make it a reliable benchmark for quality control and analytical reproducibility in peptide research laboratories.
1. Autoinhibition and phosphorylation-induced activation of phospholipase C-γ isozymes
2. High fat diet and GLP-1 drugs induce pancreatic injury in mice
3. Cationic cell-penetrating peptides are potent furin inhibitors
4. Adipose tissue is a key organ for the beneficial effects of GLP-2 metabolic function
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