1NIW

Crystal structure of endothelial nitric oxide synthase peptide bound to calmodulin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.223 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural basis for endothelial nitric oxide synthase binding to calmodulin

Aoyagi, M.Arvai, A.S.Tainer, J.A.Getzoff, E.D.

(2003) Embo J. 22: 766-775

  • DOI: 10.1093/emboj/cdg078

  • PubMed Abstract: 
  • The enzyme nitric oxide synthase (NOS) is exquisitely regulated in vivo by the Ca(2+) sensor protein calmodulin (CaM) to control production of NO, a key signaling molecule and cytotoxin. The differential activation of NOS isozymes by CaM has remained ...

    The enzyme nitric oxide synthase (NOS) is exquisitely regulated in vivo by the Ca(2+) sensor protein calmodulin (CaM) to control production of NO, a key signaling molecule and cytotoxin. The differential activation of NOS isozymes by CaM has remained enigmatic, despite extensive research. Here, the crystallographic structure of Ca(2+)-loaded CaM bound to a 20 residue peptide comprising the endothelial NOS (eNOS) CaM-binding region establishes their individual conformations and intermolecular interactions, and suggests the basis for isozyme-specific differences. The alpha-helical eNOS peptide binds in an antiparallel orientation to CaM through extensive hydrophobic interactions. Unique NOS interactions occur with: (i). the CaM flexible central linker, explaining its importance in NOS activation; and (ii). the CaM C-terminus, explaining the NOS-specific requirement for a bulky, hydrophobic residue at position 144. This binding mode expands mechanisms for CaM-mediated activation, explains eNOS deactivation by Thr495 phosphorylation, and implicates specific hydrophobic residues in the Ca(2+) independence of inducible NOS.


    Organizational Affiliation

    Department of Molecular Biology and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
calmodulin
A, C, E, G
148Rattus norvegicusGene Names: Calm2 (Cam2, Camb, CaMII)
Find proteins for P0DP30 (Rattus norvegicus)
Go to UniProtKB:  P0DP30
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Nitric-oxide synthase, endothelial
B, D, F, H
20Homo sapiensGene Names: NOS3
EC: 1.14.13.39
Find proteins for P29474 (Homo sapiens)
Go to Gene View: NOS3
Go to UniProtKB:  P29474
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CA
Query on CA

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Download CCD File 
A, C, E, G
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
EDO
Query on EDO

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Download CCD File 
C, E
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, C, E, G
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.223 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 68.521α = 90.00
b = 73.952β = 111.40
c = 71.142γ = 90.00
Software Package:
Software NamePurpose
SOLVEphasing
SHARPphasing
CNSrefinement
SCALEPACKdata scaling
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-02-18
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance