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Updated: Aug 18, 2026

A Protocol for Computer-Based Protein Structure and Function Prediction
Published on: November 3, 2011
From Src Homology domains to other signaling modules: proposal of the 'protein recognition code'
1The Department of Biochemistry, Mount Sinai School of Medicine, New York, NY 10029, USA.
Abstract:
The study of oncogenes has illuminated many aspects of cellular signaling. The delineation and characterization of protein modules exemplified by Src Homology domains has revolutionized our understanding of the molecular events underlying signal transduction pathways. Several well characterized intracellular modules which mediate protein-protein interactions, namely SH2, SH3, PH, PTB, EH, PDZ, EVH1 and WW domains, are directly involved in the multitude of membrane, cytoplasmic and nuclear processes in multicellular and/or unicellular organisms. The modular character of these protein domains and their cognate motifs, the universality of their molecular function, their widespread occurrence, and the specificity as well as the degeneracy of their interactions have prompted us to propose the concept of the 'protein recognition code'. By a parallel analogy to the universal genetic code, we propose here that there will be a finite set of precise rules to govern and predict protein-protein interactions mediated by modules. Several rules of the 'protein recognition code' have already emerged.
Insights
Scientists propose a
Area of Science:
- Molecular Biology
- Cellular Signaling
- Genomics
Background:
- Oncogene research has significantly advanced cellular signaling understanding.
- Protein modules, like Src Homology domains, are key to signal transduction.
- Intracellular modules mediate crucial protein-protein interactions in various cellular processes.
Purpose of the Study:
- To introduce the concept of a 'protein recognition code'.
- To propose a finite set of rules governing module-mediated protein interactions.
- To draw parallels between the genetic code and protein interactions.
Main Methods:
- Characterization of well-known intracellular modules (e.g., SH2, SH3, PH, PTB, EH, PDZ, EVH1, WW domains).
- Analysis of the modular nature, universal function, and interaction specificities of these domains.
- Comparative analysis with the universal genetic code.
Main Results:
- Identified several well-characterized intracellular modules involved in diverse cellular functions.
- Highlighted the universality, widespread occurrence, and specific/degenerate interactions of these modules.
- Established the foundation for the 'protein recognition code' concept.
Conclusions:
- The modular nature of protein domains suggests an underlying code for interactions.
- A finite set of rules likely governs protein-protein interactions mediated by modules.
- Emerging rules of this 'protein recognition code' are being identified.
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