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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This is version 1.4 of the entry. See complete history. 


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: 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 ...

    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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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ANTIBODY FAB FRAGMENT LIGHT CHAIN A, D, G, J214Mus musculusMutation(s): 0 
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
ANTIBODY FAB FRAGMENT HEAVY CHAIN B, E, H, K227Mus musculusMutation(s): 0 
Protein Feature View
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  • Reference Sequence
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(by identity cutoff)  |  Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
RAS AND A-FACTOR CONVERTING ENZYME 1, RCE1 C, F, I, L271Methanococcus maripaludisMutation(s): 0 
EC: 3.4.22
Membrane protein
Mpstruc		Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group: 
Intramembrane Proteases		Protein: 
CAAX protease Rce1
Find proteins for Q6LZY8 (Methanococcus maripaludis (strain S2 / LL))
Explore Q6LZY8 
Go to UniProtKB:  Q6LZY8
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
LMT
Query on LMT
Download Ideal Coordinates CCD File 
I, L
DODECYL-BETA-D-MALTOSIDE
C24 H46 O11
NLEBIOOXCVAHBD-QKMCSOCLSA-N		 Ligand Interaction
BOG
Query on BOG
Download Ideal Coordinates CCD File 
C, F
octyl beta-D-glucopyranoside
C14 H28 O6
HEGSGKPQLMEBJL-RKQHYHRCSA-N		 Ligand Interaction
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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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