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Autoinhibition and phosphorylation-induced activation mechanisms of human cancer and autoimmune disease-related E3 protein Cbl-b

Cbl-b is a RING-type E3 ubiquitin ligase that functions as a negative regulator of T-cell activation and growth factor receptor and nonreceptor-type tyrosine kinase signaling. Cbl-b dysfunction is related to autoimmune diseases and cancers in humans. However, the molecular mechanism regulating its E... Full description

Journal Title: Proceedings of the National Academy of Sciences 12/20/2011, Vol.108(51), pp.20579-20584
Main Author: Kobashigawa, Y.
Other Authors: Tomitaka, A. , Kumeta, H. , Noda, N. N. , Yamaguchi, M. , Inagaki, F.
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0027-8424 ; E-ISSN: 1091-6490 ; DOI: http://dx.doi.org/10.1073/pnas.1110712108
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recordid: crossref10.1073/pnas.1110712108
title: Autoinhibition and phosphorylation-induced activation mechanisms of human cancer and autoimmune disease-related E3 protein Cbl-b
format: Article
creator:
  • Kobashigawa, Y.
  • Tomitaka, A.
  • Kumeta, H.
  • Noda, N. N.
  • Yamaguchi, M.
  • Inagaki, F.
subjects:
  • Physical sciences -- Chemistry -- Chemical reactions
  • Physical sciences -- Chemistry -- Chemical compounds
  • Physical sciences -- Chemistry -- Chemical compounds
  • Physical sciences -- Chemistry -- Chemical compounds
  • Physical sciences -- Physics -- Condensed matter physics
  • Physical sciences -- Chemistry -- Chemical compounds
  • Health sciences -- Medical treatment -- Medical procedures
  • Health sciences -- Medical conditions -- Diseases
  • Biological sciences -- Biology -- Genetics
  • Physical sciences -- Physics -- Fundamental forces
ispartof: Proceedings of the National Academy of Sciences, 12/20/2011, Vol.108(51), pp.20579-20584
description: Cbl-b is a RING-type E3 ubiquitin ligase that functions as a negative regulator of T-cell activation and growth factor receptor and nonreceptor-type tyrosine kinase signaling. Cbl-b dysfunction is related to autoimmune diseases and cancers in humans. However, the molecular mechanism regulating its E3 activity is largely unknown. NMR and small-angle X-ray scattering analyses revealed that the unphosphorylated N-terminal region of Cbl-b forms a compact structure by an intramolecular interaction, which masks the interaction surface of the RING domain with an E2 ubiquitin-conjugating enzyme. Phosphorylation of Y363, located in the helix-linker region between the tyrosine kinase binding and the RING domains, disrupts the interdomain interaction to expose the E2 binding surface of the RING domain. Structural analysis revealed that the phosphorylated helix-RING region forms a compact structure in solution. Moreover, the phosphate group of pY363 is located in the vicinity of the interaction surface with UbcH5B to increase affinity by reducing their electrostatic repulsion. Thus, the phosphorylation of Y363 regulates the E3 activity of Cbl-b by two mechanisms: one is to remove the masking of the RING domain from the tyrosine kinase binding domain and the other is to form a surface to enhance binding affinity to E2.
language: eng
source:
identifier: ISSN: 0027-8424 ; E-ISSN: 1091-6490 ; DOI: http://dx.doi.org/10.1073/pnas.1110712108
fulltext: fulltext
issn:
  • 00278424
  • 0027-8424
  • 10916490
  • 1091-6490
url: Link


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titleAutoinhibition and phosphorylation-induced activation mechanisms of human cancer and autoimmune disease-related E3 protein Cbl-b
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descriptionCbl-b is a RING-type E3 ubiquitin ligase that functions as a negative regulator of T-cell activation and growth factor receptor and nonreceptor-type tyrosine kinase signaling. Cbl-b dysfunction is related to autoimmune diseases and cancers in humans. However, the molecular mechanism regulating its E3 activity is largely unknown. NMR and small-angle X-ray scattering analyses revealed that the unphosphorylated N-terminal region of Cbl-b forms a compact structure by an intramolecular interaction, which masks the interaction surface of the RING domain with an E2 ubiquitin-conjugating enzyme. Phosphorylation of Y363, located in the helix-linker region between the tyrosine kinase binding and the RING domains, disrupts the interdomain interaction to expose the E2 binding surface of the RING domain. Structural analysis revealed that the phosphorylated helix-RING region forms a compact structure in solution. Moreover, the phosphate group of pY363 is located in the vicinity of the interaction surface with UbcH5B to increase affinity by reducing their electrostatic repulsion. Thus, the phosphorylation of Y363 regulates the E3 activity of Cbl-b by two mechanisms: one is to remove the masking of the RING domain from the tyrosine kinase binding domain and the other is to form a surface to enhance binding affinity to E2.
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