1KQN

Crystal structure of NMN/NaMN adenylyltransferase complexed with NAD


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.218 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

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

  • 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 part ...

    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.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
NICOTINAMIDE MONONUCLEOTIDE ADENYLYL TRANSFERASEABCDEF279Homo sapiensMutation(s): 0 
Gene Names: NMNAT1NMNAT
EC: 2.7.7.1 (PDB Primary Data), 2.7.7.18 (UniProt)
Find proteins for Q9HAN9 (Homo sapiens)
Explore Q9HAN9 
Go to UniProtKB:  Q9HAN9
NIH Common Fund Data Resources
PHAROS  Q9HAN9
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAD
Query on NAD

Download CCD File 
A, B, C, D, E, F
NICOTINAMIDE-ADENINE-DINUCLEOTIDE
C21 H27 N7 O14 P2
BAWFJGJZGIEFAR-NNYOXOHSSA-N
 Ligand Interaction
XE
Query on XE

Download CCD File 
A, B, C, D, E, F
XENON
Xe
FHNFHKCVQCLJFQ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • 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
CNSrefinement
CNSphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • 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