Article ; Online: Conformational plasticity of the ClpAP AAA+ protease couples protein unfolding and proteolysis.
Nature structural & molecular biology
2020 Volume 27, Issue 5, Page(s) 406–416
Abstract: The ClpAP complex is a conserved bacterial protease that unfolds and degrades proteins targeted for destruction. The ClpA double-ring hexamer powers substrate unfolding and translocation into the ClpP proteolytic chamber. Here, we determined high- ... ...
Abstract | The ClpAP complex is a conserved bacterial protease that unfolds and degrades proteins targeted for destruction. The ClpA double-ring hexamer powers substrate unfolding and translocation into the ClpP proteolytic chamber. Here, we determined high-resolution structures of wild-type Escherichia coli ClpAP undergoing active substrate unfolding and proteolysis. A spiral of pore loop-substrate contacts spans both ClpA AAA+ domains. Protomers at the spiral seam undergo nucleotide-specific rearrangements, supporting substrate translocation. IGL loops extend flexibly to bind the planar, heptameric ClpP surface with the empty, symmetry-mismatched IGL pocket maintained at the seam. Three different structures identify a binding-pocket switch by the IGL loop of the lowest positioned protomer, involving release and re-engagement with the clockwise pocket. This switch is coupled to a ClpA rotation and a network of conformational changes across the seam, suggesting that ClpA can rotate around the ClpP apical surface during processive steps of translocation and proteolysis. |
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MeSH term(s) | Adenosine Triphosphate/analogs & derivatives ; Adenosine Triphosphate/metabolism ; Cryoelectron Microscopy ; DNA Helicases/metabolism ; Endopeptidase Clp/chemistry ; Endopeptidase Clp/genetics ; Endopeptidase Clp/metabolism ; Escherichia coli/chemistry ; Escherichia coli/genetics ; Escherichia coli/metabolism ; Escherichia coli Proteins/chemistry ; Escherichia coli Proteins/genetics ; Escherichia coli Proteins/metabolism ; Models, Molecular ; Multiprotein Complexes ; Protein Conformation ; Protein Unfolding ; Trans-Activators/metabolism |
Chemical Substances | Escherichia coli Proteins ; Multiprotein Complexes ; Trans-Activators ; replication initiator protein ; adenosine 5'-O-(3-thiotriphosphate) (35094-46-3) ; Adenosine Triphosphate (8L70Q75FXE) ; ClpA protease, E coli (EC 3.4.21.53) ; ClpP protease, E coli (EC 3.4.21.92) ; Endopeptidase Clp (EC 3.4.21.92) ; DNA Helicases (EC 3.6.4.-) |
Language | English |
Publishing date | 2020-04-20 |
Publishing country | United States |
Document type | Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S. ; Video-Audio Media |
ZDB-ID | 2126708-X |
ISSN | 1545-9985 ; 1545-9993 |
ISSN (online) | 1545-9985 |
ISSN | 1545-9993 |
DOI | 10.1038/s41594-020-0409-5 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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