Structural, Functional, and Clinical Characterization of a Novel PTPN11 Mutation Cluster Underlying Noonan Syndrome

L. Pannone, G. Bocchinfuso, E. Flex, C. Rossi, G. Baldassarre, C. Lissewski, F. Pantaleoni, F. Consoli, F. Lepri, M. Magliozzi, M. Anselmi, S. Delle Vigne, G. Sorge, K. Karaer, G. Cuturilo, A. Sartorio, S. Tinschert, M. Accadia, M.C. Digilio, G. ZampinoA. De Luca, H. Cavé, M. Zenker, B.D. Gelb, B. Dallapiccola, L. Stella, G.B. Ferrero, S. Martinelli, M. Tartaglia

Research output: Contribution to journalArticlepeer-review

Abstract

Germline mutations in PTPN11, the gene encoding the Src-homology 2 (SH2) domain-containing protein tyrosine phosphatase (SHP2), cause Noonan syndrome (NS), a relatively common, clinically variable, multisystem disorder. Here, we report on the identification of five different PTPN11 missense changes affecting residues Leu261, Leu262, and Arg265 in 16 unrelated individuals with clinical diagnosis of NS or with features suggestive for this disorder, specifying a novel disease-causing mutation cluster. Expression of the mutant proteins in HEK293T cells documented their activating role on MAPK signaling. Structural data predicted a gain-of-function role of substitutions at residues Leu262 and Arg265 exerted by disruption of the N-SH2/PTP autoinhibitory interaction. Molecular dynamics simulations suggested a more complex behavior for changes affecting Leu261, with possible impact on SHP2's catalytic activity/selectivity and proper interaction of the PTP domain with the regulatory SH2 domains. Consistent with that, biochemical data indicated that substitutions at codons 262 and 265 increased the catalytic activity of the phosphatase, while those affecting codon 261 were only moderately activating but impacted substrate specificity. Remarkably, these mutations underlie a relatively mild form of NS characterized by low prevalence of cardiac defects, short stature, and cognitive and behavioral issues, as well as less evident typical facial features. © 2017 WILEY PERIODICALS, INC.
Original languageEnglish
Pages (from-to)451-459
Number of pages9
JournalHuman Mutation
Volume38
Issue number4
DOIs
Publication statusPublished - 2017

Keywords

  • genotype-phenotype correlation analysis
  • Noonan syndrome
  • PTPN11 mutations
  • structural and functional studies
  • arginine
  • genomic DNA
  • leucine
  • mitogen activated protein kinase
  • mutant protein
  • protein kinase B
  • protein SH2
  • protein tyrosine phosphatase SHP 2
  • protein binding
  • PTPN11 protein, human
  • allosterism
  • Article
  • catalysis
  • clinical feature
  • codon
  • enzyme specificity
  • exon
  • face dysmorphia
  • genotype phenotype correlation
  • germline mutation
  • HEK293 cell line
  • heterozygote
  • human
  • low set ear
  • missense mutation
  • molecular dynamics
  • priority journal
  • protein conformation
  • protein expression
  • protein function
  • protein phosphorylation
  • protein protein interaction
  • protein structure
  • ptosis
  • pulmonary valve stenosis
  • short stature
  • signal transduction
  • chemistry
  • genetic predisposition
  • genetics
  • MAPK signaling
  • metabolism
  • molecular model
  • mutation
  • pathology
  • protein domain
  • Src homology domain
  • Genetic Predisposition to Disease
  • HEK293 Cells
  • Humans
  • MAP Kinase Signaling System
  • Models, Molecular
  • Mutation
  • Mutation, Missense
  • Noonan Syndrome
  • Protein Binding
  • Protein Domains
  • Protein Tyrosine Phosphatase, Non-Receptor Type 11
  • src Homology Domains

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