Cullin-7 (915-923)

Cullin-7 (915-923) is a synthetic peptide fragment derived from the C-terminal region of the Cullin-7 protein, a member of the cullin family of E3 ubiquitin ligase scaffold proteins. This peptide represents amino acids 915 to 923 of the human Cullin-7 sequence, a region implicated in protein-protein interactions and regulatory mechanisms within the ubiquitin-proteasome system. The study of Cullin-7 and its specific peptide motifs has garnered significant interest due to the protein's role in cell cycle control, signal transduction, and the targeted degradation of key regulatory proteins. As a research-use peptide, Cullin-7 (915-923) offers valuable opportunities to investigate the functional domains of Cullin-7, elucidate mechanisms of ubiquitin ligase assembly, and explore the broader landscape of post-translational modification in cellular processes.

Peptide-protein interaction studies: Researchers employ the Cullin-7 (915-923) peptide to dissect specific binding interfaces within the Cullin-7 protein and its interaction partners. By using this defined sequence in in vitro binding assays, pull-down experiments, or surface plasmon resonance analyses, investigators can map the molecular determinants underlying Cullin-7's association with adaptor proteins, substrate receptors, or other components of the ubiquitin ligase complex. Such studies facilitate a deeper understanding of how this region contributes to the assembly and specificity of multi-subunit E3 ligases.

Ubiquitin ligase mechanism research: The 915-923 peptide fragment provides a focused tool for probing the structural and functional features of the Cullin-7 scaffold in the context of ubiquitin-mediated proteolysis. By introducing the peptide into biochemical assays or cell-free reconstitution systems, scientists can assess its capacity to disrupt or modulate the activity of the full-length Cullin-7 protein. This approach helps reveal the contribution of this segment to complex formation, substrate recognition, and the overall regulation of protein turnover.

Antibody epitope mapping: The defined sequence of Cullin-7 (915-923) serves as a valuable antigenic peptide for generating and characterizing antibodies specific to the C-terminal region of Cullin-7. Researchers can utilize this peptide in immunoassays, such as ELISA or western blotting, to determine antibody specificity, map epitopes, or validate antibody performance in detecting endogenous or recombinant Cullin-7. This application is critical for developing reliable immunodetection tools for protein expression and localization studies.

Peptide-based inhibitor screening: As a mimic of a functional domain within Cullin-7, the 915-923 peptide can be used in competitive binding or high-throughput screening assays to identify small molecules or peptides capable of modulating Cullin-7 interactions. By serving as a template or competitor, it enables the identification and characterization of compounds that may interfere with the assembly or activity of the Cullin-7 ubiquitin ligase complex. Such screening efforts provide valuable leads for chemical biology research and the study of protein-protein interaction modulators.

Post-translational modification analysis: The Cullin-7 (915-923) peptide is also advantageous for investigating potential post-translational modifications, such as phosphorylation, ubiquitination, or sumoylation, that may occur within this region. Synthetic peptides corresponding to specific protein segments allow for the precise examination of modification sites using mass spectrometry or in vitro modification assays. These studies contribute to the broader understanding of regulatory mechanisms controlling Cullin-7 function and the dynamic modulation of E3 ligase activity in cellular signaling networks.

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