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Updated: Feb 15, 2026
Peptide-based Identification of Functional Motifs and their Binding Partners
Published on: June 30, 2013
Transcriptome-wide identification and competitive disruption of sacum-binding partners in human colorectal cancer
Yinguang Zhang1, Yongwang Zhang2, Yuxiang Zhang3
1Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, China.
Abstract:
Human sacum is regulatory adaptor protein involved in cellular signaling network of colorectal cancer. Molecular evidences suggest that the protein is integrated into oncogenic signaling network by binding to SH3-containing proteins through its proline-rich motifs. In this study, we have performed a transcriptome-wide analysis and identification of sacum-binding partners in the genome profile of human colorectal cancer. The sacum-binding potency of SH3-containing proteins found in colorectal cancer was investigated by using bioinformatics modeling and intermolecular binding analysis. With the protocol we were able to predict those high-affinity domain binders of the proline-rich peptides of human sacum in a high-throughput manner, and to analyze sequence-specific interaction in the domain-peptide recognition at molecular level. Consequently, a number of putative domain binders with both high affinity and specificity were identified, from which the Src SH3 domain was selected as a case study and tested for its binding activity towards the sacum peptides. We also designed two peptide variants that may have potent capability to competitively disrupt sacum interaction with its partners.
Insights
This study identifies sacum-binding partners in colorectal cancer, revealing potential therapeutic targets. High-affinity interactions were predicted, and peptide variants were designed to disrupt sacum binding.
Area of Science:
- Molecular Biology
- Bioinformatics
- Oncology
Background:
- Sacum is a regulatory adaptor protein implicated in colorectal cancer signaling.
- Its proline-rich motifs mediate interactions with SH3-containing proteins in oncogenic networks.
Purpose of the Study:
- To identify sacum-binding partners within the human colorectal cancer genome.
- To investigate the binding affinity of SH3-containing proteins to sacum using bioinformatics and molecular analysis.
Main Methods:
- Transcriptome-wide analysis for sacum-binding partner identification.
- Bioinformatics modeling and intermolecular binding analysis for affinity prediction.
- High-throughput screening of domain-peptide interactions and molecular-level analysis.
Main Results:
- Identification of numerous high-affinity and specific sacum-binding partners in colorectal cancer.
- The Src SH3 domain was validated as a case study for binding activity with sacum peptides.
- Development of two peptide variants designed to competitively inhibit sacum-protein interactions.
Conclusions:
- The study successfully identified and characterized sacum-binding partners in colorectal cancer.
- The identified interactions and developed peptide variants offer potential therapeutic strategies for colorectal cancer treatment.
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