2QQG

Hst2 bound to ADP-HPD, acetyllated histone H4 and nicotinamide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.218 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural basis for nicotinamide inhibition and base exchange in sir2 enzymes.

Sanders, B.D.Zhao, K.Slama, J.T.Marmorstein, R.

(2007) Mol Cell 25: 463-472

  • DOI: 10.1016/j.molcel.2006.12.022
  • Primary Citation of Related Structures:  
    2QQG, 2QQF, 2OD9, 2OD7, 2OD2

  • PubMed Abstract: 
  • The Sir2 family of proteins consists of broadly conserved NAD(+)-dependent deacetylases that are implicated in diverse biological processes, including DNA regulation, metabolism, and longevity. Sir2 proteins are regulated in part by the cellular conc ...

    The Sir2 family of proteins consists of broadly conserved NAD(+)-dependent deacetylases that are implicated in diverse biological processes, including DNA regulation, metabolism, and longevity. Sir2 proteins are regulated in part by the cellular concentrations of a noncompetitive inhibitor, nicotinamide, that reacts with a Sir2 reaction intermediate via a base-exchange reaction to reform NAD(+) at the expense of deacetylation. To gain a mechanistic understanding of nicotinamide inhibition in Sir2 enzymes, we captured the structure of nicotinamide bound to a Sir2 homolog, yeast Hst2, in complex with its acetyl-lysine 16 histone H4 substrate and a reaction intermediate analog, ADP-HPD. Together with related biochemical studies and structures, we identify a nicotinamide inhibition and base-exchange site that is distinct from the so-called "C pocket" binding site for the nicotinamide group of NAD(+). These results provide insights into the Sir2 mechanism of nicotinamide inhibition and have important implications for the development of Sir2-specific effectors.


    Organizational Affiliation

    The Wistar Institute, University of Pennsylvania, Philadelphia, PA 19104, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
NAD-dependent deacetylase HST2A308Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: HST2
EC: 3.5.1 (PDB Primary Data), 2.3.1.286 (UniProt)
Find proteins for P53686 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P53686 
Go to UniProtKB:  P53686
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H4B11N/AMutation(s): 0 
Find proteins for P02309 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P02309 
Go to UniProtKB:  P02309
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
A1R
Query on A1R

Download CCD File 
A
5'-O-[(S)-{[(S)-{[(2R,3R,4S)-3,4-DIHYDROXYPYRROLIDIN-2-YL]METHOXY}(HYDROXY)PHOSPHORYL]OXY}(HYDROXY)PHOSPHORYL]ADENOSINE
C15 H24 N6 O12 P2
NDQDTBCXPOIQGT-UHNJQBFTSA-N
 Ligand Interaction
NCA
Query on NCA

Download CCD File 
A
NICOTINAMIDE
C6 H6 N2 O
DFPAKSUCGFBDDF-UHFFFAOYSA-N
 Ligand Interaction
ZN
Query on ZN

Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
ALY
Query on ALY
BL-PEPTIDE LINKINGC8 H16 N2 O3LYS
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
NCAIC50:  91000   nM  BindingDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.218 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 105.94α = 90
b = 105.94β = 90
c = 67.1γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing
CNSrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-10-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-10-25
    Changes: Refinement description