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• W2034823619 endingPage "1217" @default.
• W2034823619 startingPage "1211" @default.
• W2034823619 abstract "Syk is a cytoplasmic tyrosine kinase that is activated after recruitment to immune receptors, triggering the phopshorylation of downstream targets. The kinase activity of Syk is controlled by an auto-inhibited conformation consisting of a regulatory region that contains two N-terminal Src homology 2 (SH2) domains inhibiting the catalytic activity of the kinase domain located at the C-terminus. The atomic structure of the related Zap-70 kinase and an electron microscopy (EM) model of Syk have revealed the structural mechanism of this auto-inhibition based on the formation of a compact conformation sustained by interactions between the regulatory and catalytic domains. On the other hand, the structural basis of Syk activation is not fully understood due to the lack of a 3D structure of full-length Syk in an active conformation. Here, we have used single-particle electron microscopy to analyse the conformational changes taking place in an activated form of Syk induced by auto-phosphorylation. The conformation of phosphorylated Syk is reminiscent of the compact structure of the inhibited protein but significant conformational changes are observed in the regulatory region. These rearrangements could be sufficient to disrupt the inhibitory interactions, contributing to Syk activation. These results suggest that the regulation of the activation of Syk might be modulated by subtle changes in the positioning of the regulatory domains rather than a full opening mechanism as proposed for the Src kinases." @default.
• W2034823619 created "2016-06-24" @default.
• W2034823619 creator A5011405150 @default.
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• W2034823619 creator A5053679121 @default.
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• W2034823619 date "2009-08-01" @default.
• W2034823619 modified "2023-10-15" @default.
• W2034823619 title "Conformational rearrangements upon Syk auto-phosphorylation" @default.
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• W2034823619 doi "https://doi.org/10.1016/j.bbapap.2009.04.010" @default.
• W2034823619 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2746503" @default.
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• W2034823619 hasPublicationYear "2009" @default.
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