Crystal structure of NMN/NaMN adenylyltransferase complexed with NAD

Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.218 

wwPDB Validation   3D Report Full Report

Ligand Structure Quality Assessment 

This is version 1.2 of the entry. See complete history


Structure of Human Nicotinamide/Nicotonic Acid Mononucleotide Adenylyltransferase. Basis for the dual substrate specificity and activation of the oncolytic agent tiazofurin.

Zhou, T.Kurnasov, O.Tomchick, D.R.Binns, D.D.Grishin, N.V.Marquez, V.E.Osterman, A.L.Zhang, H.

(2003) J Biol Chem 277: 13148-13154

  • DOI: https://doi.org/10.1074/jbc.M111469200
  • Primary Citation of Related Structures:  
    1KQN, 1KQO, 1KR2

  • PubMed Abstract: 

    Nicotinamide/nicotinate mononucleotide (NMN/ NaMN)adenylyltransferase (NMNAT) is an indispensable enzyme in the biosynthesis of NAD(+) and NADP(+). Human NMNAT displays unique dual substrate specificity toward both NMN and NaMN, thus flexible in participating in both de novo and salvage pathways of NAD synthesis. Human NMNAT also catalyzes the rate-limiting step of the metabolic conversion of the anticancer agent tiazofurin to its active form tiazofurin adenine dinucleotide (TAD). The tiazofurin resistance is mainly associated with the low NMNAT activity in the cell. We have solved the crystal structures of human NMNAT in complex with NAD, deamido-NAD, and a non-hydrolyzable TAD analogue beta-CH(2)-TAD. These complex structures delineate the broad substrate specificity of the enzyme toward both NMN and NaMN and reveal the structural mechanism for adenylation of tiazofurin nucleotide. The crystal structure of human NMNAT also shows that it forms a barrel-like hexamer with the predicted nuclear localization signal sequence located on the outside surface of the barrel, supporting its functional role of interacting with the nuclear transporting proteins. The results from the analytical ultracentrifugation studies are consistent with the formation of a hexamer in solution under certain conditions.

  • Organizational Affiliation

    Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D, E
A, B, C, D, E, F
279Homo sapiensMutation(s): 0 
EC: (PDB Primary Data), (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for Q9HAN9 (Homo sapiens)
Explore Q9HAN9 
Go to UniProtKB:  Q9HAN9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9HAN9
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on NAD

Download Ideal Coordinates CCD File 
G [auth A]
K [auth B]
P [auth C]
T [auth D]
W [auth E]
G [auth A],
K [auth B],
P [auth C],
T [auth D],
W [auth E],
Z [auth F]
C21 H27 N7 O14 P2
Query on XE

Download Ideal Coordinates CCD File 
AA [auth F]
H [auth A]
I [auth A]
J [auth A]
L [auth B]
AA [auth F],
H [auth A],
I [auth A],
J [auth A],
L [auth B],
M [auth B],
N [auth B],
O [auth B],
Q [auth C],
R [auth C],
S [auth C],
U [auth D],
V [auth D],
X [auth E],
Y [auth E]
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.218 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 130.816α = 90
b = 90.879β = 116.85
c = 136.585γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report

Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-01-07
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance