1H2H

Crystal structure of TM1643

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.226 

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This is version 1.4 of the entry. See complete history. 


Literature

Aspartate dehydrogenase, a novel enzyme identified from structural and functional studies of TM1643.

Yang, Z., Savchenko, A., Yakunin, A., Zhang, R., Edwards, A., Arrowsmith, C., Tong, L.

(2003) J Biol Chem 278: 8804-8808

  • DOI: 10.1074/jbc.M211892200
  • Primary Citation of Related Structures:  
    1H2H

  • PubMed Abstract: 

    • The open reading frame TM1643 of Thermotoga maritima belongs to a large family of proteins, with homologues in bacteria, archaea, and eukaryotes. TM1643 is found in an operon with two other genes that encode enzymes involved in the biosynthesis of NAD. In several bacteria, the gene in the position occupied by TM1643 encodes an aspartate oxidase (NadB), which synthesizes iminoaspartate as a substrate for NadA, the next enzyme in the pathway ...

    The open reading frame TM1643 of Thermotoga maritima belongs to a large family of proteins, with homologues in bacteria, archaea, and eukaryotes. TM1643 is found in an operon with two other genes that encode enzymes involved in the biosynthesis of NAD. In several bacteria, the gene in the position occupied by TM1643 encodes an aspartate oxidase (NadB), which synthesizes iminoaspartate as a substrate for NadA, the next enzyme in the pathway. The amino acid sequence of TM1643 does not share any recognizable homology with aspartate oxidase or with other proteins of known functions or structures. To help define the biological functions of TM1643, we determined its crystal structure at 2.6A resolution and performed a series of screens for enzymatic function. The structure reveals the presence of an N-terminal Rossmann fold domain with a bound NAD(+) cofactor and a C-terminal alpha+beta domain. The structural information suggests that TM1643 may be a dehydrogenase and the active site of the enzyme is located at the interface between the two domains. The enzymatic characterization of TM1643 revealed that it possesses NAD or NADP-dependent dehydrogenase activity toward l-aspartate but no aspartate oxidase activity. The product of the aspartate dehydrogenase activity is also iminoaspartate. Therefore, our studies demonstrate that two different enzymes, an oxidase and a dehydrogenase, may have evolved to catalyze the first step of NAD biosynthesis in prokaryotes. TM1643 establishes a new class of amino acid dehydrogenases.

    Organizational Affiliation: 

    Department of Biological Sciences, Columbia University, New York, New York 10027, USA.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HYPOTHETICAL PROTEIN TM1643A241Thermotoga maritimaMutation(s): 0 
EC: 1.4.1.21
UniProt
Find proteins for Q9X1X6 (Thermotoga maritima (strain ATCC 43589 / DSM 3109 / JCM 10099 / NBRC 100826 / MSB8))
Explore Q9X1X6 
Go to UniProtKB:  Q9X1X6
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAD (Subject of Investigation/LOI)
Query on NAD
Download Ideal Coordinates CCD File 
 B [auth A]NICOTINAMIDE-ADENINE-DINUCLEOTIDE
C21 H27 N7 O14 P2
BAWFJGJZGIEFAR-NNYOXOHSSA-N		 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE		AL-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.226 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.196α = 90
b = 63.196β = 90
c = 125.673γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
SnBphasing
SOLVEphasing
CNSrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-08-15
    Type: Initial release
  • Version 1.1: 2015-04-29
    Changes: Derived calculations, Non-polymer description, Other, Refinement description, Version format compliance
  • Version 1.2: 2017-07-05
    Changes: Refinement description
  • Version 1.3: 2018-06-13
    Changes: Data collection, Database references
  • Version 1.4: 2019-08-21
    Changes: Data collection, Database references, Derived calculations