Structure of the M3 Muscarinic Acetylcholine Receptor Basolateral Sorting Signal

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

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This is version 1.3 of the entry. See complete history


Identification and structural determination of the M3 muscarinic acetylcholine receptor basolateral sorting signal.

Iverson, H.A.Fox, D.Nadler, L.S.Klevit, R.E.Nathanson, N.M.

(2005) J Biol Chem 280: 24568-24575

  • DOI: https://doi.org/10.1074/jbc.M501264200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Muscarinic acetylcholine receptors comprise a family of G-protein-coupled receptors that display differential localization in polarized epithelial cells. We identify a seven-residue sequence, Ala(275)-Val(281), in the third intracellular loop of the M(3) muscarinic receptor that mediates dominant, position-independent basolateral targeting in Madin-Darby canine kidney cells. Mutational analyses identify Glu(276), Phe(280), and Val(281) as critical residues within this sorting motif. Phe(280) and Val(281) comprise a novel dihydrophobic sorting signal as mutations of either residue singly or together with leucine do not disrupt basolateral targeting. Conversely, Glu(276) is required and cannot be substituted with alanine or aspartic acid. A 19-amino acid peptide representing the M(3) sorting signal and surrounding sequence was analyzed via two-dimensional nuclear magnetic resonance spectroscopy. Solution structures show that Glu(276) resides in a type IV beta-turn and the dihydrophobic sequence Phe(280)Val(281) adopts either a type I or IV beta-turn.

  • Organizational Affiliation

    Department of Pharmacology, University of Washington, Seattle, Washington 98195, USA.


Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Muscarinic acetylcholine receptor M319N/AMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P20309 (Homo sapiens)
Explore P20309 
Go to UniProtKB:  P20309
PHAROS:  P20309
GTEx:  ENSG00000133019 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP20309
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-05-31
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2022-03-09
    Changes: Data collection, Database references, Derived calculations