4CAD

Mechanism of farnesylated CAAX protein processing by the integral membrane protease Rce1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.228 

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Literature

Mechanism of Farnesylated Caax Protein Processing by the Intramembrane Protease Rce1

Manolaridis, I.Kulkarni, K.Dodd, R.B.Ogasawara, S.Zhang, Z.Bineva, G.O'Reilly, N.Hanrahan, S.J.Thompson, A.J.Cronin, N.Iwata, S.Barford, D.

(2013) Nature 504: 301

  • DOI: https://doi.org/10.1038/nature12754
  • Primary Citation of Related Structures:  
    4CAD

  • PubMed Abstract: 

    CAAX proteins have essential roles in multiple signalling pathways, controlling processes such as proliferation, differentiation and carcinogenesis. The ∼120 mammalian CAAX proteins function at cellular membranes and include the Ras superfamily of small GTPases, nuclear lamins, the γ-subunit of heterotrimeric GTPases, and several protein kinases and phosphatases. The proper localization of CAAX proteins to cell membranes is orchestrated by a series of post-translational modifications of the carboxy-terminal CAAX motifs (where C is cysteine, A is an aliphatic amino acid and X is any amino acid). These reactions involve prenylation of the cysteine residue, cleavage at the AAX tripeptide and methylation of the carboxyl-prenylated cysteine residue. The major CAAX protease activity is mediated by Rce1 (Ras and a-factor converting enzyme 1), an intramembrane protease (IMP) of the endoplasmic reticulum. Information on the architecture and proteolytic mechanism of Rce1 has been lacking. Here we report the crystal structure of a Methanococcus maripaludis homologue of Rce1, whose endopeptidase specificity for farnesylated peptides mimics that of eukaryotic Rce1. Its structure, comprising eight transmembrane α-helices, and catalytic site are distinct from those of other IMPs. The catalytic residues are located ∼10 Å into the membrane and are exposed to the cytoplasm and membrane through a conical cavity that accommodates the prenylated CAAX substrate. We propose that the farnesyl lipid binds to a site at the opening of two transmembrane α-helices, which results in the scissile bond being positioned adjacent to a glutamate-activated nucleophilic water molecule. This study suggests that Rce1 is the founding member of a novel IMP family, the glutamate IMPs.


  • Organizational Affiliation

    Institute of Cancer Research, 237 Fulham Road, London, SW3 6JB, UK.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ANTIBODY FAB FRAGMENT LIGHT CHAIN
A, D, G, J
214Mus musculusMutation(s): 0 
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
ANTIBODY FAB FRAGMENT HEAVY CHAIN
B, E, H, K
227Mus musculusMutation(s): 0 
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
RAS AND A-FACTOR CONVERTING ENZYME 1, RCE1
C, F, I, L
271Methanococcus maripaludisMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for Q6LZY8 (Methanococcus maripaludis (strain S2 / LL))
Explore Q6LZY8 
Go to UniProtKB:  Q6LZY8
Entity Groups  
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UniProt GroupQ6LZY8
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.228 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 113.063α = 89.06
b = 90.087β = 102.29
c = 99.3γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-11-27
    Type: Initial release
  • Version 1.1: 2013-12-11
    Changes: Database references
  • Version 1.2: 2013-12-18
    Changes: Database references
  • Version 1.3: 2018-01-24
    Changes: Source and taxonomy
  • Version 1.4: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Other, Structure summary
  • Version 1.5: 2023-12-20
    Changes: Data collection, Database references, Refinement description, Structure summary