• Register
Forgot Password

If you have forgotten your password you can enter your email here and get a temporary password sent to your email.


Leaving Community

Are you sure you want to leave this community? Leaving the community will revoke any permissions you have been granted in this community.


The lumenal domain of Sec63p stimulates the ATPase activity of BiP and mediates BiP recruitment to the translocon in Saccharomyces cerevisiae.

We studied the molecular nature of the interaction between the integral membrane protein Sec63p and the lumenal Hsp70 BiP to elucidate their role in the process of precursor transit into the ER of Saccharomyces cerevisiae. A lumenal stretch of Sec63p with homology to the Escherichia coli protein DnaJ is the likely region of interface between Sec63p and BiP. This domain, purified as a fusion protein (63Jp) with glutathione S-transferase (GST), mediated a stable ATP-dependent binding interaction between 63Jp and BiP and stimulated the ATPase activity of BiP. The interaction was highly selective because only BiP was retained on immobilized 63Jp when detergent-solubilized microsomes were mixed with ATP and the fusion protein. GST alone was inactive in these assays. Additionally, a GST fusion containing a point mutation in the lumenal domain of Sec63p did not interact with BiP. Finally, we found that the soluble Sec63p lumenal domain inhibited efficient precursor import into proteoliposomes reconstituted so as to incorporate both BiP and the fusion protein. We conclude that the lumenal domain of Sec63p is sufficient to mediate enzymatic interaction with BiP and that this interaction positioned at the translocation apparatus or translocon at the lumenal face of the ER is vital for protein translocation into the ER.

Pubmed ID: 9199165


  • Corsi AK
  • Schekman R


The Journal of cell biology

Publication Data

June 30, 1997

Associated Grants

  • Agency: NIGMS NIH HHS, Id: GM26755

Mesh Terms

  • Adenosine Triphosphatases
  • Fungal Proteins
  • Gene Expression Regulation, Fungal
  • HSP70 Heat-Shock Proteins
  • Heat-Shock Proteins
  • Membrane Proteins
  • Membrane Transport Proteins
  • Saccharomyces cerevisiae
  • Saccharomyces cerevisiae Proteins