Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Dihedral - D3  (3D View)
Global Stoichiometry: Homo 6-mer - A6 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 197.84 kDa 
• Atom Count: 12082 
• Residue Count: 1388 
• Unique protein chains: 1

1KQN

Crystal structure of NMN/NaMN adenylyltransferase complexed with NAD

• DOI: 10.2210/pdb1KQN/pdb

• Classification: TRANSFERASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2002-01-07 Released: 2003-01-07 
• Deposition Author(s): Zhou, T., Kurnasov, O., Tomchick, D.R., Binns, D.D., Grishin, N.V., Marquez, V.E., Osterman, A.L., Zhang, H.

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Experimental Data Snapshot

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

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

• PubMed: 11788603 
• 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 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.

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Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
NICOTINAMIDE MONONUCLEOTIDE ADENYLYL TRANSFERASE	A, B, C, D, E, F	279	Homo sapiens	Mutation(s): 0  Gene Names: NMNAT1, NMNAT 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 GTEx  ENSG00000173614

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NAD	A, B, C, D, E, F	NICOTINAMIDE-ADENINE-DINUCLEOTIDE C21 H27 N7 O14 P2 BAWFJGJZGIEFAR-NNYOXOHSSA-N
XE	A, B, C, D, E, F	XENON Xe FHNFHKCVQCLJFQ-UHFFFAOYSA-N

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 = 130.816	α = 90
b = 90.879	β = 116.85
c = 136.585	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
CNS	refinement
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2002-01-07 
• Released Date: 2003-01-07 
Deposition Author(s): Zhou, T., Kurnasov, O., Tomchick, D.R., Binns, D.D., Grishin, N.V., Marquez, V.E., Osterman, A.L., Zhang, H.

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