1Y8F

Solution structure of the munc13-1 C1-domain


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 2000 
  • Conformers Submitted: 20 
  • Selection Criteria: STRUCTURES WITH LOWEST NOE ENERGY 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Intramolecular occlusion of the diacylglycerol-binding site in the C1 domain of munc13-1.

Shen, N.Guryev, O.Rizo, J.

(2005) Biochemistry 44: 1089-1096

  • DOI: 10.1021/bi0476127

  • PubMed Abstract: 
  • Protein kinase C (PKC) isozymes and other receptors of diacylglycerol (DAG) bind to this widespread second messenger through their C(1) domains. These alternative DAG receptors include munc13-1, a large neuronal protein that is crucial for DAG-depend ...

    Protein kinase C (PKC) isozymes and other receptors of diacylglycerol (DAG) bind to this widespread second messenger through their C(1) domains. These alternative DAG receptors include munc13-1, a large neuronal protein that is crucial for DAG-dependent augmentation of neurotransmitter release. Whereas the structures of several PKC C(1) domains have been determined and have been shown to require little conformational changes for ligand binding, it is unclear whether the C(1) domains from other DAG receptors contain specific structural features with key functional significance. To gain insight into this question, we have determined the three-dimensional structure in solution of the munc13-1 C(1) domain using NMR spectroscopy. The overall structure includes two beta-sheets, a short C-terminal alpha-helix, and two Zn(2+)-binding sites, resembling the structures of PKC C(1) domains. However, the munc13-1 C(1) domain exhibits striking structural differences with the PKC C(1) domains in the ligand-binding site. These differences result in occlusion of the binding site of the munc13-1 C(1) domain by a conserved tryptophan side chain that in PKCs adopts a completely different orientation. As a consequence, the munc13-1 C(1) domain requires a considerable conformational change for ligand binding. This structural distinction is expected to decrease the DAG affinity of munc13-1 compared to that of PKCs, and is likely to be critical for munc13-1 function. On the basis of these results, we propose that augmentation of neurotransmitter release may be activated at higher DAG levels than PKCs as a potential mechanism for uncoupling augmentation of release from the multitude of other signaling processes mediated by DAG.


    Organizational Affiliation

    Department of Biochemistry, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Unc-13 homolog A
A
66Rattus norvegicusGene Names: Unc13a (Unc13h1)
Find proteins for Q62768 (Rattus norvegicus)
Go to UniProtKB:  Q62768
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 2000 
  • Conformers Submitted: 20 
  • Selection Criteria: STRUCTURES WITH LOWEST NOE ENERGY 
  • Olderado: 1Y8F Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-04-12
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance