Central domain deletions affect the SAXS solution structure and function of Yeast Hsp40 proteins Sis1 and Ydj1

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  • Silva, Julio C
    • Other Affiliation: Department of Condensed Matter Physics, “Gleb Wataghin” Physics Institute, State University of Campinas (UNICAMP), Campinas, SP 13083-859, Brazil; Brazilian Biosciences National Laboratory, Center for Research in Energy and Materials (CNPEM), Campinas, SP 13083-970, Brazil; European Synchrotron Radiation Facility, Grenoble, France
  • Borges, Julio C
    • Other Affiliation: Institute of Chemistry of São Carlos, University of São Paulo, São Carlos, SP 13.560-970, Brazil
  • Cyr, Douglas
    • Affiliation: School of Medicine, Department of Cell Biology and Physiology
  • Ramos, Carlos HI
    • Other Affiliation: Department of Organic Chemistry, Institute of Chemistry, University of Campinas UNICAMP, SP 13083-970, Brazil
  • Torriani, Iris L
    • Other Affiliation: Department of Condensed Matter Physics, “Gleb Wataghin” Physics Institute, State University of Campinas (UNICAMP), Campinas, SP 13083-859, Brazil; Brazilian Biosciences National Laboratory, Center for Research in Energy and Materials (CNPEM), Campinas, SP 13083-970, Brazil
Abstract
  • Abstract Background Ydj1 and Sis1 are structurally and functionally distinct Hsp40 proteins of the yeast cytosol. Sis1 is an essential gene whereas the ydj1 gene is essential for growth at elevated temperatures and cannot complement sis1 gene deletion. Truncated polypeptides capable of complementing the sis1 gene deletion comprise the J-domain of either Sis1 or Ydj1 connected to the G/F region of Sis1 (but not Ydj1). Sis1 mutants in which the G/F was deleted but G/M maintained were capable of complementing the sis1 gene deletion. Results To investigate the relevance of central domains on the structure and function of Ydj1 and Sis1 we prepared Sis1 constructs deleting specific domains. The mutants had decreased affinity for heated luciferase but were equally capable of stimulating ATPase activity of Hsp70. Detailed low resolution structures were obtained and the overall flexibility of Hsp40 and its mutants were assessed using SAXS methods. Deletion of either the G/M or the G/M plus CTDI domains had little impact on the quaternary structure of Sis1 analyzed by the SAXS technique. However, deletion of the ZFLR-CTDI changed the relative position of the J-domains in Ydj1 in such a way that they ended up resembling that of Sis1. The results revealed that the G/F and G/M regions are not the only flexible domains. All model structures exhibit a common clamp-like conformation. Conclusions Our results suggest that the central domains, previously appointed as important features for substrate binding, are also relevant keeping the J-domains in their specific relative positions. The clamp-like architecture observed seems also to be favorable to the interactions of Hsp40 with Hsp70.
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  • Article
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  • In Copyright
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  • Julio C Silva et al.; licensee BioMed Central Ltd.
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Journal title
  • BMC Structural Biology
Journal volume
  • 11
Journal issue
  • 1
Page start
  • 40
Language
  • English
Is the article or chapter peer-reviewed?
  • Yes
ISSN
  • 1472-6807
Bibliographic citation
  • BMC Structural Biology. 2011 Oct 19;11(1):40
Publisher
  • BioMed Central Ltd
Access right
  • Open Access
Date uploaded
  • August 23, 2012

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file details 1472-6807-11-40.pdf 2019-05-06 Public Download
file details Table S2. Chi-values (root mean square of χ2) obtained from the fit of the theoretical scattering calculated from the models of the experimental intensity curve. 2019-05-06 Public Download
file details 1472-6807-11-40.xml 2019-05-06 Public Download
file details Figure S1. Model fits for the four proteins studied in this work. 2019-05-06 Public Download