6WSK

Crystal Structure of the Cannabinoid Receptor 1 Interacting Protein 1a (CRIP1a)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.207 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Cannabinoid receptor interacting protein 1a interacts with myristoylated G alpha i N terminus via a unique gapped beta-barrel structure.

Booth, W.T.Clodfelter, J.E.Leone-Kabler, S.Hughes, E.K.Eldeeb, K.Howlett, A.C.Lowther, W.T.

(2021) J Biol Chem 297: 101099-101099

  • DOI: 10.1016/j.jbc.2021.101099
  • Primary Citation of Related Structures:  
    6WSK

  • PubMed Abstract: 
  • Cannabinoid receptor interacting protein 1a (CRIP1a) modulates CB 1 cannabinoid receptor G-protein coupling in part by altering the selectivity for Gα i subtype activation, but the molecular basis for this function of CRIP1a is not known ...

    Cannabinoid receptor interacting protein 1a (CRIP1a) modulates CB 1 cannabinoid receptor G-protein coupling in part by altering the selectivity for Gα i subtype activation, but the molecular basis for this function of CRIP1a is not known. We report herein the first structure of CRIP1a at 1.55 Å resolution. CRIP1a exhibits a 10-stranded, antiparallel β-barrel with an interior comprised of conserved hydrophobic residues and loops at the bottom and a short helical cap at the top to exclude solvent. The β-barrel has a gap between strands β8 and β10, which deviates from β-sandwich fatty acid binding proteins that carry endocannabinoid compounds and the Rho-guanine nucleotide dissociation inhibitor (GDI) predicted by computational threading algorithms. The structural homology search program DALI identified CRIP1a as homologous to a family of lipidated-protein carriers that includes PDE6δ and Unc119. Comparison with these proteins suggests that CRIP1a may carry two possible types of cargo: either (i) like PDE6δ, cargo with a farnesyl moiety that enters from the top of the β-barrel to occupy the hydrophobic interior, or (ii) like Unc119, cargo with a palmitoyl or myristoyl moiety that enters from the side where the missing β-strand creates an opening to the hydrophobic pocket. Fluorescence polarization analysis demonstrated CRIP1a binding of an N-terminally myristoylated 9-mer peptide mimicking the Gα i N-terminus. However, CRIP1a could not bind the non-myristolyated Gα i peptide or cargo of homologs. Thus, binding of CRIP1a to Gαi proteins represents a novel mechanism to regulate cell signaling initiated by the CB 1 receptor.


    Organizational Affiliation

    Department of Biochemistry and Center for Structural Biology, Wake Forest School of Medicine, Medical Center Blvd., Winston-Salem, NC 27157; Center for Molecular Signaling, Wake Forest University, 1834 Wake Forest Road, Winston-Salem, NC 27109, USA. Electronic address: tlowther@wakehealth.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Endolysin,CB1 cannabinoid receptor-interacting protein 1 fusionA346Escherichia virus T4Rattus norvegicus
This entity is chimeric
Mutation(s): 4 
Gene Names: ECnrip1
EC: 3.2.1.17
UniProt
Find proteins for Q5M7A7 (Rattus norvegicus)
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Go to UniProtKB:  Q5M7A7
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Go to UniProtKB:  P00720
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.207 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 68.177α = 90
b = 68.177β = 90
c = 146.648γ = 90
Software Package:
Software NamePurpose
Cootmodel building
PHENIXrefinement
CrysalisProdata reduction
CrysalisProdata scaling
PHENIXphasing

Structure Validation

View Full Validation Report




Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute on Drug Abuse (NIH/NIDA)United StatesDA042157

Revision History  (Full details and data files)

  • Version 1.0: 2021-09-08
    Type: Initial release
  • Version 1.1: 2021-09-29
    Changes: Database references