3QO6 image
Deposition Date 2011-02-09
Release Date 2011-05-04
Last Version Date 2024-11-06
Entry Detail
PDB ID:
3QO6
Keywords:
Title:
Crystal structure analysis of the plant protease Deg1
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.50 Å
R-Value Free:
0.26
R-Value Work:
0.21
R-Value Observed:
0.22
Space Group:
P 61 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Protease Do-like 1, chloroplastic
Gene (Uniprot):DEGP1
Chain IDs:A, B, C
Chain Length:348
Number of Molecules:3
Biological Source:Arabidopsis thaliana
Polymer Type:polypeptide(L)
Molecule:peptide
Chain IDs:D
Chain Length:7
Number of Molecules:1
Biological Source:unidentified
Polymer Type:polypeptide(L)
Molecule:peptide
Chain IDs:E, H, I
Chain Length:4
Number of Molecules:3
Biological Source:unidentified
Polymer Type:polypeptide(L)
Molecule:peptide
Chain IDs:F
Chain Length:5
Number of Molecules:1
Biological Source:unidentified
Polymer Type:polypeptide(L)
Molecule:peptide
Chain IDs:G
Chain Length:3
Number of Molecules:1
Biological Source:unidentified
Primary Citation
Structural adaptation of the plant protease Deg1 to repair photosystem II during light exposure.
Nat.Struct.Mol.Biol. 18 728 731 (2011)
PMID: 21532594 DOI: 10.1038/nsmb.2055

Abstact

Deg1 is a chloroplastic protease involved in maintaining the photosynthetic machinery. Structural and biochemical analyses reveal that the inactive Deg1 monomer is transformed into the proteolytically active hexamer at acidic pH. The change in pH is sensed by His244, which upon protonation, repositions a specific helix to trigger oligomerization. This system ensures selective activation of Deg1 during daylight, when acidification of the thylakoid lumen occurs and photosynthetic proteins are damaged.

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Primary Citation of related structures