- EMDB-40586: CryoEM reconstruction of full-length Btk (class 1) -
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Basic information
Entry
Database: EMDB / ID: EMD-40586
Title
CryoEM reconstruction of full-length Btk (class 1)
Map data
Sharpened map
Sample
Complex: Full-length Bruton's Tyrosine Kinase
Protein or peptide: Full-length Bruton's Tyrosine Kinase
Keywords
Bruton's Tyrosine Kinase / ATP-binding / protein phosphorylation / TRANSFERASE
Function / homology
Function and homology information
G beta:gamma signalling through BTK / RHO GTPases Activate WASPs and WAVEs / FCERI mediated Ca+2 mobilization / G alpha (12/13) signalling events / G alpha (q) signalling events / Antigen activates B Cell Receptor (BCR) leading to generation of second messengers / proteoglycan catabolic process / monocyte proliferation / positive regulation of interleukin-17A production / Regulation of actin dynamics for phagocytic cup formation ...G beta:gamma signalling through BTK / RHO GTPases Activate WASPs and WAVEs / FCERI mediated Ca+2 mobilization / G alpha (12/13) signalling events / G alpha (q) signalling events / Antigen activates B Cell Receptor (BCR) leading to generation of second messengers / proteoglycan catabolic process / monocyte proliferation / positive regulation of interleukin-17A production / Regulation of actin dynamics for phagocytic cup formation / eosinophil homeostasis / positive regulation of type III hypersensitivity / B cell affinity maturation / positive regulation of synoviocyte proliferation / histamine secretion by mast cell / neutrophil homeostasis / cellular response to molecule of fungal origin / positive regulation of type I hypersensitivity / cellular response to interleukin-7 / DAP12 signaling / negative regulation of cytokine production / positive regulation of immunoglobulin production / phospholipase activator activity / negative regulation of interleukin-10 production / negative regulation of B cell proliferation / positive regulation of NLRP3 inflammasome complex assembly / phospholipase binding / phosphatidylinositol-3,4,5-trisphosphate binding / positive regulation of phagocytosis / cell maturation / positive regulation of B cell proliferation / cellular response to reactive oxygen species / B cell receptor signaling pathway / non-membrane spanning protein tyrosine kinase activity / non-specific protein-tyrosine kinase / positive regulation of interleukin-6 production / positive regulation of tumor necrosis factor production / protein tyrosine kinase activity / cytoplasmic vesicle / histone H3Y41 kinase activity / histone H2AXY142 kinase activity / response to lipopolysaccharide / intracellular signal transduction / membrane raft / innate immune response / apoptotic process / perinuclear region of cytoplasm / ATP binding / identical protein binding / nucleus / metal ion binding / plasma membrane / cytosol / cytoplasm Similarity search - Function
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
United States
Citation
Journal: Elife / Year: 2024 Title: Conformational heterogeneity of the BTK PHTH domain drives multiple regulatory states. Authors: David Yin-Wei Lin / Lauren E Kueffer / Puneet Juneja / Thomas E Wales / John R Engen / Amy H Andreotti / Abstract: Full-length Bruton's tyrosine kinase (BTK) has been refractory to structural analysis. The nearest full-length structure of BTK to date consists of the autoinhibited SH3-SH2-kinase core. Precisely ...Full-length Bruton's tyrosine kinase (BTK) has been refractory to structural analysis. The nearest full-length structure of BTK to date consists of the autoinhibited SH3-SH2-kinase core. Precisely how the BTK N-terminal domains (the Pleckstrin homology/Tec homology [PHTH] domain and proline-rich regions [PRR] contain linker) contribute to BTK regulation remains unclear. We have produced crystals of full-length BTK for the first time but despite efforts to stabilize the autoinhibited state, the diffraction data still reveal only the SH3-SH2-kinase core with no electron density visible for the PHTH-PRR segment. Cryo-electron microscopy (cryoEM) data of full-length BTK, on the other hand, provide the first view of the PHTH domain within full-length BTK. CryoEM reconstructions support conformational heterogeneity in the PHTH-PRR region wherein the globular PHTH domain adopts a range of states arrayed around the autoinhibited SH3-SH2-kinase core. On the way to activation, disassembly of the SH3-SH2-kinase core opens a new autoinhibitory site on the kinase domain for PHTH domain binding that is ultimately released upon interaction of PHTH with phosphatidylinositol (3,4,5)-trisphosphate. Membrane-induced dimerization activates BTK and we present here a crystal structure of an activation loop swapped BTK kinase domain dimer that likely represents the conformational state leading to trans-autophosphorylation. Together, these data provide the first structural elucidation of full-length BTK and allow a deeper understanding of allosteric control over the BTK kinase domain during distinct stages of activation.
Model: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 300 / Support film - Material: CARBON / Support film - topology: HOLEY / Support film - Film thickness: 12 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 120 sec.
Vitrification
Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277.15 K / Instrument: FEI VITROBOT MARK IV
Details
The sample was monodisperse.
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Electron microscopy
Microscope
TFS GLACIOS
Image recording
Film or detector model: GATAN K3 (6k x 4k) / Digitization - Dimensions - Width: 11520 pixel / Digitization - Dimensions - Height: 8184 pixel / Number grids imaged: 1 / Number real images: 755 / Average exposure time: 2.0 sec. / Average electron dose: 59.0 e/Å2 Details: Images were collected in Super-resolution made at 50 frames per second
Electron beam
Acceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
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