4Y6O

Human SIRT2 in complex with myristoylated peptide (TNF-alphaK20myr)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.206 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Kinetic and Structural Basis for Acyl-Group Selectivity and NAD(+) Dependence in Sirtuin-Catalyzed Deacylation.

Feldman, J.L.Dittenhafer-Reed, K.E.Kudo, N.Thelen, J.N.Ito, A.Yoshida, M.Denu, J.M.

(2015) Biochemistry 54: 3037-3050

  • DOI: 10.1021/acs.biochem.5b00150
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Acylation of lysine is an important protein modification regulating diverse biological processes. It was recently demonstrated that members of the human Sirtuin family are capable of catalyzing long chain deacylation, in addition to the well-known NA ...

    Acylation of lysine is an important protein modification regulating diverse biological processes. It was recently demonstrated that members of the human Sirtuin family are capable of catalyzing long chain deacylation, in addition to the well-known NAD(+)-dependent deacetylation activity [Feldman, J. L., Baeza, J., and Denu, J. M. (2013) J. Biol. Chem. 288, 31350-31356]. Here we provide a detailed kinetic and structural analysis that describes the interdependence of NAD(+)-binding and acyl-group selectivity for a diverse series of human Sirtuins, SIRT1-SIRT3 and SIRT6. Steady-state and rapid-quench kinetic analyses indicated that differences in NAD(+) saturation and susceptibility to nicotinamide inhibition reflect unique kinetic behavior displayed by each Sirtuin and depend on acyl substrate chain length. Though the rate of nucleophilic attack of the 2'-hydroxyl on the C1'-O-alkylimidate intermediate varies with acyl substrate chain length, this step remains rate-determining for SIRT2 and SIRT3; however, for SIRT6, this step is no longer rate-limiting for long chain substrates. Cocrystallization of SIRT2 with myristoylated peptide and NAD(+) yielded a co-complex structure with reaction product 2'-O-myristoyl-ADP-ribose, revealing a latent hydrophobic cavity to accommodate the long chain acyl group, and suggesting a general mechanism for long chain deacylation. Comparing two separately determined co-complex structures containing either a myristoylated peptide or 2'-O-myristoyl-ADP-ribose indicates there are conformational changes at the myristoyl-ribose linkage with minimal structural differences in the enzyme active site. During the deacylation reaction, the fatty acyl group is held in a relatively fixed position. We describe a kinetic and structural model to explain how various Sirtuins display unique acyl substrate preferences and how different reaction kinetics influence NAD(+) dependence. The biological implications are discussed.


    Organizational Affiliation

    Department of Biomolecular Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53715.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
NAD-dependent protein deacetylase sirtuin-2
A, B
293Homo sapiensMutation(s): 0 
Gene Names: SIRT2 (SIR2L, SIR2L2)
EC: 3.5.1.-
Find proteins for Q8IXJ6 (Homo sapiens)
Go to Gene View: SIRT2
Go to UniProtKB:  Q8IXJ6
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
peptide LEU-PRO-LYS-MYK-THR-GLY-GLY
C, D
7Homo sapiensMutation(s): 0 
Gene Names: TNF (TNFA, TNFSF2)
Find proteins for P01375 (Homo sapiens)
Go to Gene View: TNF
Go to UniProtKB:  P01375
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MYK
Query on MYK
C, D
L-peptide linkingC20 H40 N2 O3LYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.206 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 37.136α = 101.07
b = 48.785β = 91.33
c = 96.960γ = 112.27
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
MOLREPphasing
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-01-06
    Type: Initial release