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Title: Identification and characterization of a large family of superbinding bacterial SH2 domains

Journal Article · · Nature Communications
ORCiD logo [1];  [2];  [3];  [3];  [2];  [2];  [4];  [3];  [5];  [6];  [4];  [7]
  1. Western University, London (Canada). Department of Biochemistry, Schulich School of Medicine and Dentistry; DOE/OSTI
  2. University of Toronto, Toronto (Canada). Department of Chemical Engineering and Applied Chemistry
  3. Western University, London (Canada). Department of Biochemistry, Schulich School of Medicine and Dentistry
  4. MaRS Centre, Toronto (Canada). Departments of Biochemistry and Molecular Genetics
  5. Western University, London (Canada). Department of Biochemistry, Schulich School of Medicine and Dentistry; Qingdao University (China). Cancer institute, the Affiliated Hospital of Qingdao University, Qingdao Cancer Institute and School of Basic Medicine
  6. University of Toronto, Toronto (Canada). Department of Chemical Engineering and Applied Chemistry; University of Calgary (Canada). Department of Microbiology, Immunology and Infectious Diseases
  7. Western University, London (Canada). Department of Biochemistry, Schulich School of Medicine and Dentistry; Lawson Health Research Institute, London (Canada). Children’s Health Research Institute

Src homology 2 (SH2) domains play a critical role in signal transduction in mammalian cells by binding to phosphorylated Tyr (pTyr). Apart from a few isolated cases in viruses, no functional SH2 domain has been identified to date in prokaryotes. Here we identify 93 SH2 domains from Legionella that are distinct in sequence and specificity from mammalian SH2 domains. The bacterial SH2 domains are not only capable of binding proteins or peptides in a Tyr phosphorylation-dependent manner, some bind pTyr itself with micromolar affinities, a property not observed for mammalian SH2 domains. The Legionella SH2 domains feature the SH2 fold and a pTyr-binding pocket, but lack a specificity pocket found in a typical mammalian SH2 domain for recognition of sequences flanking the pTyr residue. Our work expands the boundary of phosphotyrosine signalling to prokaryotes, suggesting that some bacterial effector proteins have acquired pTyr-superbinding characteristics to facilitate bacterium-host interactions.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1624120
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 9; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Molecular Mimicry: a Paradigm of Host-Microbe Coevolution Illustrated by Legionella journal October 2020
SH2 Domain Binding: Diverse FLVRs of Partnership journal September 2020
Intracellular parasitism, the driving force of evolution of Legionella pneumophila and the genus Legionella journal June 2019
Intracellular parasitism, the driving force of evolution of Legionella pneumophila and the genus Legionella journal May 2019
Tyrosine Phosphorylation as a Widespread Regulatory Mechanism in Prokaryotes journal July 2019