1ZZQ

Rat nNOS D597N mutant with L-N(omega)-Nitroarginine-(4R)-amino-L-proline amide bound


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.220 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Exploring the Binding Conformations of Bulkier Dipeptide Amide Inhibitors in Constitutive Nitric Oxide Synthases.

Li, H.Flinspach, M.L.Igarashi, J.Jamal, J.Yang, W.Litzinger, E.A.Huang, H.Erdal, E.P.Silverman, R.B.Poulos, T.L.

(2005) Biochemistry 44: 15222-15229

  • DOI: 10.1021/bi0513610
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • A series of L-nitroarginine-based dipeptide inhibitors are highly selective for neuronal nitric oxide synthase (nNOS) over the endothelial isoform (eNOS). Crystal structures of these dipeptides bound to both isoforms revealed two different conformati ...

    A series of L-nitroarginine-based dipeptide inhibitors are highly selective for neuronal nitric oxide synthase (nNOS) over the endothelial isoform (eNOS). Crystal structures of these dipeptides bound to both isoforms revealed two different conformations, curled in nNOS and extended in eNOS, corresponding to higher and lower binding affinity to the two isoforms, respectively. In previous studies we found that the primary reason for selectivity is that Asp597 in nNOS, which is Asn368 in eNOS, provides greater electrostatic stabilization in the inhibitor complex. While this is the case for smaller dipeptide inhibitors, electrostatic stabilization may no longer be the sole determinant for isoform selectivity with bulkier dipeptide inhibitors. Another residue farther away from the active site, Met336 in nNOS (Val106 in eNOS), is in contact with bulkier dipeptide inhibitors. Double mutants were made to exchange the D597/M336 pair in nNOS with N368/V106 in eNOS. Here we report crystal structures and inhibition constants for bulkier dipeptide inhibitors bound to nNOS and eNOS that illustrate the important role played by residues near the entry to the active site in isoform selective inhibition.


    Related Citations: 
    • Structural Basis for Dipeptide Amide Isoform-Selective Inhibition of Neuronal Nitric Oxide Synthase
      Flinspach, M.L.,Li, H.,Jamal, J.,Yang, W.,Huang, H.,Hah, J.M.,Gomez-Vidal, J.A.,Litzinger, E.A.,Silverman, R.B.,Poulos, T.L.
      (2004) Nat.Struct.Mol.Biol. 11: 54


    Organizational Affiliation

    Department of Molecular Biology and Biochemistry, University of California, Irvine, California 92697-3900, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Nitric-oxide synthase, brain
A, B
420Rattus norvegicusMutation(s): 1 
Gene Names: Nos1 (Bnos)
EC: 1.14.13.39
Find proteins for P29476 (Rattus norvegicus)
Go to UniProtKB:  P29476
Small Molecules
Ligands 6 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

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A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
ACT
Query on ACT

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A, B
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
MTL
Query on MTL

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A, B
D-MANNITOL
C6 H14 O6
FBPFZTCFMRRESA-KVTDHHQDSA-N
 Ligand Interaction
HEM
Query on HEM

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A, B
PROTOPORPHYRIN IX CONTAINING FE
HEME
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
H4B
Query on H4B

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A, B
5,6,7,8-TETRAHYDROBIOPTERIN
C9 H15 N5 O3
FNKQXYHWGSIFBK-RPDRRWSUSA-N
 Ligand Interaction
DP9
Query on DP9

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A, B
L-N(OMEGA)-NITROARGININE-(4R)-AMINO-L-PROLINE AMIDE
C11 H22 N8 O4
IUFRDGFKAVLPFZ-CSMHCCOUSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
DP9IC50: 640 nM (99) BINDINGDB
DP9Ki: 100 nM (99) BINDINGDB
DP9Ki: 20000 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.220 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 51.860α = 90.00
b = 110.320β = 90.00
c = 164.600γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
SCALEPACKdata scaling
CNSrefinement
CNSphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-12-06
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance