Display Settings:

Format

Send to:

Choose Destination
See comment in PubMed Commons below
Proc Natl Acad Sci U S A. 2000 Apr 11;97(8):3901-6.

A sequence resembling a peroxisomal targeting sequence directs the interaction between the tetratricopeptide repeats of Ssn6 and the homeodomain of alpha 2.

Author information

  • 1Department of Biochemistry and Biophysics, University of California, Box 0414, San Francisco, CA 94143, USA.

Abstract

The tetratricopeptide repeat (TPR) is a 34-aa sequence motif, typically found in tandem clusters, that occurs in proteins of bacteria, archea, and eukaryotes. TPRs interact with other proteins, although few details on TPR-protein interactions are known. In this paper we show that a portion of a loop in the homeodomain of the DNA-binding protein alpha2 is required for its recognition by the TPRs of the corepressor Ssn6. The amino acid sequence of this loop is similar to the sequences recognized by the TPRs of an entirely different protein, Pex5, which directs peroxisomal import. We further show that alpha2 can be made to bind specifically in vitro to the TPRs of Pex5 and that a point mutation that disrupts the alpha2-Ssn6 interaction also disrupts the alpha2-Pex5 interaction. These results demonstrate that two different TPR proteins recognize their target by a similar mechanism, raising the possibility that other TPR-target interactions could occur through the same means.

PMID:
10759558
[PubMed - indexed for MEDLINE]
PMCID:
PMC18114
Free PMC Article

Images from this publication.See all images (5)Free text

Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for HighWire Icon for PubMed Central
    Loading ...
    Write to the Help Desk