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Differences in the dynamics of the tandem-SH2 modules of the Syk and ZAP-70 tyrosine kinases

Journal Article · · Protein Science
DOI:https://doi.org/10.1002/pro.4199· OSTI ID:2470656
 [1];  [2];  [3];  [4];  [5];  [5]
  1. University of California, Berkeley, CA (United States); Univ. of California, Irvine, CA (United States)
  2. University of California, Berkeley, CA (United States); Howard Hughes Medical Institute, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Columbia Univ., New York, NY (United States)
  3. Department of Molecular and Cell Biology University of California Berkeley California USA
  4. University of California, Berkeley, CA (United States); Howard Hughes Medical Institute, Berkeley, CA (United States)
  5. University of California, Berkeley, CA (United States); Howard Hughes Medical Institute, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

The catalytic activity of Syk-family tyrosine kinases is regulated by a tandem Src homology 2 module (tSH2 module). In the autoinhibited state, this module adopts a conformation that stabilizes an inactive conformation of the kinase domain. The binding of the tSH2 module to phosphorylated immunoreceptor tyrosine-based activation motifs necessitates a conformational change, thereby relieving kinase inhibition and promoting activation. We determined the crystal structure of the isolated tSH2 module of Syk and find, in contrast to ZAP-70, that its conformation more closely resembles that of the peptide-bound state, rather than the autoinhibited state. Hydrogen–deuterium exchange by mass spectrometry, as well as molecular dynamics simulations, reveal that the dynamics of the tSH2 modules of Syk and ZAP-70 differ, with most of these differences occurring in the C-terminal SH2 domain. Our data suggest that the conformational landscapes of the tSH2 modules in Syk and ZAP-70 have been tuned differently, such that the autoinhibited conformation of the Syk tSH2 module is less stable. This feature of Syk likely contributes to its ability to more readily escape autoinhibition when compared to ZAP-70, consistent with tighter control of downstream signaling pathways in T cells.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE; National Institutes of Health (NIH)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2470656
Journal Information:
Protein Science, Journal Name: Protein Science Journal Issue: 12 Vol. 30; ISSN 0961-8368
Publisher:
Wiley -- The Protein SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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