Download MendeleyCrystal structure of ClpA, an HSP100 chaperone and regulator of ClpAP protease
Guo, F., Maurizi, M.R., Esser, L., Xia, D.(2002) J Biol Chem 277: 46743-46752
- PubMed: 12205096
- DOI: https://doi.org/10.1074/jbc.M207796200
- Primary Citation of Related Structures:
1K6K, 1KSF - PubMed Abstract:
Escherichia coli ClpA, an Hsp100/Clp chaperone and an integral component of the ATP-dependent ClpAP protease, participates in regulatory protein degradation and the dissolution and degradation of protein aggregates. The crystal structure of the ClpA subunit reveals an N-terminal domain with pseudo-twofold symmetry and two AAA(+) modules (D1 and D2) each consisting of a large and a small sub-domain with ADP bound in the sub-domain junction. The N-terminal domain interacts with the D1 domain in a manner similar to adaptor-binding domains of other AAA(+) proteins. D1 and D2 are connected head-to-tail consistent with a cooperative and vectorial translocation of protein substrates. In a planar hexamer model of ClpA, built by assembling ClpA D1 and D2 into homohexameric rings of known structures of AAA(+) modules, the differences in D1-D1 and D2-D2 interfaces correlate with their respective contributions to hexamer stability and ATPase activity.
Organizational Affiliation:
Laboratory of Cell Biology, Center for Cancer Research, NCI, National Institutes of Health, Bethesda, Maryland 20892, USA.
