1KKU

Crystal structure of nuclear human nicotinamide mononucleotide adenylyltransferase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.247 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure of human NMN adenylyltransferase. A key nuclear enzyme for NAD homeostasis.

Garavaglia, S.D'Angelo, I.Emanuelli, M.Carnevali, F.Pierella, F.Magni, G.Rizzi, M.

(2002) J Biol Chem 277: 8524-8530

  • DOI: 10.1074/jbc.M111589200
  • Primary Citation of Related Structures:  
    1KKU

  • PubMed Abstract: 
  • Nicotinamide mononucleotide adenylyltransferase (NMNAT), a member of the nucleotidyltransferase alpha/beta-phosphodiesterases superfamily, catalyzes a universal step (NMN + ATP = NAD + PP(i)) in NAD biosynthesis. Localized within the nucleus, the act ...

    Nicotinamide mononucleotide adenylyltransferase (NMNAT), a member of the nucleotidyltransferase alpha/beta-phosphodiesterases superfamily, catalyzes a universal step (NMN + ATP = NAD + PP(i)) in NAD biosynthesis. Localized within the nucleus, the activity of the human enzyme is greatly altered in tumor cells, rendering it a promising target for cancer chemotherapy. By using a combination of single isomorphous replacement and density modification techniques, the human NMNAT structure was solved by x-ray crystallography to a 2.5-A resolution, revealing a hexamer that is composed of alpha/beta-topology subunits. The active site topology of the enzyme, analyzed through homology modeling and structural comparison with other NMNATs, yielded convincing evidence for a substrate-induced conformational change. We also observed remarkable structural conservation in the ATP-recognition motifs GXXXPX(T/H)XXH and SXTXXR, which we take to be the universal signature for NMNATs. Structural comparison of human and prokaryotic NMNATs may also lead to the rational design of highly selective antimicrobial drugs.


    Organizational Affiliation

    Department of Genetics and Microbiology A. Buzzati Traverso, University of Pavia, Via Ferrata 1, 27100 Pavia, Italy.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
NICOTINAMIDE MONONUCLEOTIDE ADENYLYLTRANSFERASEA279Homo 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
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.247 
  • Space Group: P 63 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 147.459α = 90
b = 147.459β = 90
c = 61.71γ = 120
Software Package:
Software NamePurpose
SHELXSphasing
REFMACrefinement
MOSFLMdata reduction
CCP4data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-06-10
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance