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A Protocol for Functional Assessment of Whole-Protein Saturation Mutagenesis Libraries Utilizing High-Throughput Sequencing
Published on: July 3, 2016
Decoding SHP2 mutations by computational saturation mutagenesis
Chen Wang1, Xiao Tang1, Qiaobin Yao2
1School of Life Science and Technology, ShanghaiTech University, Shanghai 201210, China.
Abstract:
Src-homology-2-containing protein tyrosine phosphatase 2 (SHP2), encoded by the PTPN11 gene, is a master regulator of cell growth, survival, and differentiation. Normally, SHP2 is kept in a self-inhibited state, in which its N-terminal SH2 domain blocks the catalytic site. SHP2 activation is directly tied to the disruption of the self-inhibition. While mutations that disrupt this self-inhibited state can cause developmental disorders and cancer, most SHP2 variants remain functionally uncharacterized. Using computational saturation mutagenesis, we systematically analyzed > 9000 single-amino acid substitutions in the SH2 and PTP domains. Our analysis of binding energy changes identified key residues-especially A72 and G503-whose mutation destabilizes the autoinhibited conformation. Functional assays further demonstrated that mutations within the SH2 and PTP domains significantly enhance enzymatic activity, downstream signaling, and cellular proliferation. By integrating clinical data, we found that pathogenic variants preferentially adopt the destabilizing conformations, directly linking structural changes to disease. This work provides a comprehensive map of SHP2 mutation effects, highlights conformational opening as a key driver of pathogenicity, and establishes a predictive framework for interpreting the functional impact of uncharacterized variants in multi-domain proteins.
Insights
Src-homology-2-containing protein tyrosine phosphatase 2 (SHP2) mutations can disrupt its self-inhibited state, driving disease. Our study maps these effects, revealing conformational changes linked to pathogenicity.
Area of Science:
- Biochemistry
- Molecular Biology
- Genetics
Background:
- Src-homology-2-containing protein tyrosine phosphatase 2 (SHP2) regulates crucial cellular processes.
- SHP2 normally exists in a self-inhibited state, preventing aberrant activation.
- Mutations disrupting this autoinhibition are linked to developmental disorders and cancer.
Purpose of the Study:
- To systematically analyze the functional impact of SHP2 single-amino acid substitutions.
- To identify key residues and structural changes associated with SHP2 pathogenicity.
- To develop a predictive framework for uncharacterized SHP2 variants.
Main Methods:
- Computational saturation mutagenesis of SHP2 SH2 and PTP domains (>9000 substitutions).
- Analysis of binding energy changes to predict conformational stability.
- Functional assays to assess enzymatic activity, signaling, and proliferation.
- Integration of clinical data to correlate variants with disease.
Main Results:
- Identified key residues (e.g., A72, G503) destabilizing the autoinhibited conformation.
- Demonstrated that SH2 and PTP domain mutations enhance SHP2 activity, signaling, and proliferation.
- Pathogenic variants were found to preferentially adopt destabilizing conformations.
Conclusions:
- Conformational opening is a primary driver of SHP2 pathogenicity.
- Structural destabilization directly links SHP2 mutations to disease.
- Provides a comprehensive map and predictive framework for SHP2 variant interpretation.
