4YNN

Structure of Legionella pneumophila DegQ (S190A variant)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.181 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structures of DegQ from Legionella pneumophila Define Distinct ON and OFF States.

Schubert, A.Wrase, R.Hilgenfeld, R.Hansen, G.

(2015) J.Mol.Biol. 427: 2840-2851

  • DOI: 10.1016/j.jmb.2015.06.023
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • HtrA (high-temperature requirement A) family proteins play important roles in protein-quality control processes in the bacterial periplasm. A common feature of all members of this family is their modular organization comprising a chymotrypsin-like pr ...

    HtrA (high-temperature requirement A) family proteins play important roles in protein-quality control processes in the bacterial periplasm. A common feature of all members of this family is their modular organization comprising a chymotrypsin-like protease domain and at least one PDZ (postsynaptic density of 95 kDa, disks large homolog 1 and zonula occludens 1) domain. All characterized HtrA proteins assemble into complex oligomers consisting of typically 3-24 monomers, which allow a tight regulation of proteolytic activity. Here, we provide evidence that the assembly of proteolytically active, higher-order complexes of DegQ from Legionella pneumophila is triggered by the binding of substrate-derived peptides. Crystal structures of inactive 3-mers and active 12-mers of DegQ reveal molecular details of elements of a conserved allosteric activation cascade that defines distinct protease ON and OFF states. Results from DegQ(Lp) variants harboring structure-based amino acid substitutions indicate that peptide binding to the PDZ1 domain is critical for proteolytic activity but not for the formation of higher-order oligomers. Combining structural, mutagenesis and biochemical data, we show that, in contrast to the proteolytic activity, the chaperone function of DegQ is not affected by the state of the activation cascade.


    Organizational Affiliation

    Institute of Biochemistry, Center for Structural and Cell Biology in Medicine, University of Lübeck, Ratzeburger Allee 160, 23538 Lübeck, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Protease DO
A, B, C, D, E, F, G, H
448Legionella pneumophila subsp. pneumophila (strain Philadelphia 1 / ATCC 33152 / DSM 7513)Mutation(s): 1 
Gene Names: htrA
EC: 3.4.21.107
Find proteins for Q5ZVV9 (Legionella pneumophila subsp. pneumophila (strain Philadelphia 1 / ATCC 33152 / DSM 7513))
Go to UniProtKB:  Q5ZVV9
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Octapeptide
I
8N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Hexa-peptide
J, L
6N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Hepta-peptide
K, M, N, O, P
7N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 5
MoleculeChainsSequence LengthOrganismDetails
UNK-UNK-UNK
Q, R, S, T, U, V
3N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
UNK
Query on UNK
I, J, K, L, M, N, O, P, Q, R, S, T, U, V
L-PEPTIDE LINKINGC4 H9 N O2

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.181 
  • Space Group: P 63
Unit Cell:
Length (Å)Angle (°)
a = 147.909α = 90.00
b = 147.909β = 90.00
c = 383.514γ = 120.00
Software Package:
Software NamePurpose
PHENIXphasing
MOSFLMdata reduction
SCALAdata scaling
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
DFGGermanyEXC 306
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Revision History 

  • Version 1.0: 2015-06-24
    Type: Initial release
  • Version 1.1: 2015-08-05
    Type: Database references
  • Version 1.2: 2015-08-26
    Type: Database references