4YPL image
Entry Detail
PDB ID:
4YPL
Keywords:
Title:
Crystal structure of a hexameric LonA protease bound to three ADPs
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2015-03-13
Release Date:
2016-03-16
Method Details:
Experimental Method:
Resolution:
3.45 Å
R-Value Free:
0.26
R-Value Work:
0.23
R-Value Observed:
0.23
Space Group:
P 21 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Lon protease
Mutations:E423Q
Chain IDs:A, B, C, D (auth: F), E (auth: D), F (auth: E)
Chain Length:555
Number of Molecules:6
Biological Source:Meiothermus taiwanensis
Primary Citation
Structural Insights into the Allosteric Operation of the Lon AAA+ Protease
Structure 24 667 675 (2016)
PMID: 27041592 DOI: 10.1016/j.str.2016.03.001

Abstact

The Lon AAA+ protease (LonA) is an evolutionarily conserved protease that couples the ATPase cycle into motion to drive substrate translocation and degradation. A hallmark feature shared by AAA+ proteases is the stimulation of ATPase activity by substrates. Here we report the structure of LonA bound to three ADPs, revealing the first AAA+ protease assembly where the six protomers are arranged alternately in nucleotide-free and bound states. Nucleotide binding induces large coordinated movements of conserved pore loops from two pairs of three non-adjacent protomers and shuttling of the proteolytic groove between the ATPase site and a previously unknown Arg paddle. Structural and biochemical evidence supports the roles of the substrate-bound proteolytic groove in allosteric stimulation of ATPase activity and the conserved Arg paddle in driving substrate degradation. Altogether, this work provides a molecular framework for understanding how ATP-dependent chemomechanical movements drive allosteric processes for substrate degradation in a major protein-destruction machine.

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