4X3P

Sirt2 in complex with a myristoyl peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.173 
  • R-Value Work: 0.154 
  • R-Value Observed: 0.155 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Deacylation Mechanism by SIRT2 Revealed in the 1'-SH-2'-O-Myristoyl Intermediate Structure.

Wang, Y.Fung, Y.M.E.Zhang, W.He, B.Chung, M.W.H.Jin, J.Hu, J.Lin, H.Hao, Q.

(2017) Cell Chem Biol 24: 339-345

  • DOI: https://doi.org/10.1016/j.chembiol.2017.02.007
  • Primary Citation of Related Structures:  
    4X3O, 4X3P

  • PubMed Abstract: 

    Sirtuins are NAD-dependent deacylases. Previous studies have established two important enzymatic intermediates in sirtuin-catalyzed deacylation, an alkylamidate intermediate I, which is then converted to a bicyclic intermediate II. However, how intermediate II is converted to products is unknown. Based on potent SIRT2-specific inhibitors we developed, here we report crystal structures of SIRT2 in complexes with a thiomyristoyl lysine peptide-based inhibitor and carba-NAD or NAD. Interestingly, by soaking crystals with NAD, we capture a distinct covalent catalytic intermediate (III) that is different from the previously established intermediates I and II. In this intermediate, the covalent bond between the S and the myristoyl carbonyl carbon is broken, and we believe this intermediate III to be the decomposition product of II en route to form the end products. MALDI-TOF data further support the intermediate III formation. This is the first time such an intermediate has been captured by X-ray crystallography and provides more mechanistic insights into sirtuin-catalyzed reactions.


  • Organizational Affiliation

    School of Biomedical Sciences, University of Hong Kong, Hong Kong, China.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
NAD-dependent protein deacetylase sirtuin-2304Homo sapiensMutation(s): 0 
Gene Names: SIRT2SIR2LSIR2L2
EC: 3.5.1 (PDB Primary Data), 2.3.1 (UniProt), 2.3.1.286 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for Q8IXJ6 (Homo sapiens)
Explore Q8IXJ6 
Go to UniProtKB:  Q8IXJ6
PHAROS:  Q8IXJ6
GTEx:  ENSG00000068903 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8IXJ6
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
peptide PRO-LYS-LYS-THR-GLYB [auth C]5Homo sapiensMutation(s): 0 
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.173 
  • R-Value Work: 0.154 
  • R-Value Observed: 0.155 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 37.606α = 90
b = 77.7β = 97.73
c = 56.473γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling
PDB_EXTRACTdata extraction
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-01-13
    Type: Initial release
  • Version 1.1: 2022-04-20
    Changes: Database references, Derived calculations
  • Version 1.2: 2023-11-08
    Changes: Data collection, Refinement description