Structure of Apo Human SIRT5 P114T Mutant

Experimental Data Snapshot

  • Resolution: 2.70 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.184 

Starting Model: experimental
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Human SIRT5 variants with reduced stability and activity do not cause neuropathology in mice.

Yuan, T.Kumar, S.Skinner, M.E.Victor-Joseph, R.Abuaita, M.Keijer, J.Zhang, J.Kunkel, T.J.Liu, Y.Petrunak, E.M.Saunders, T.L.Lieberman, A.P.Stuckey, J.A.Neamati, N.Al-Murshedi, F.Alfadhel, M.Spelbrink, J.N.Rodenburg, R.de Boer, V.C.J.Lombard, D.B.

(2024) iScience 27: 109991-109991

  • DOI: https://doi.org/10.1016/j.isci.2024.109991
  • Primary Citation of Related Structures:  
    8GBL, 8GBN

  • PubMed Abstract: 

    SIRT5 is a sirtuin deacylase that removes negatively charged lysine modifications, in the mitochondrial matrix and elsewhere in the cell. In benign cells and mouse models, under basal conditions, the phenotypes of SIRT5 deficiency are quite subtle. Here, we identify two homozygous SIRT5 variants in patients suspected to have mitochondrial disease. Both variants, P114T and L128V, are associated with reduced SIRT5 protein stability and impaired biochemical activity, with no evidence of neomorphic or dominant negative properties. The crystal structure of the P114T enzyme was solved and shows only subtle deviations from wild-type. Via CRISPR-Cas9, we generated a mouse model that recapitulates the human P114T mutation; homozygotes show reduced SIRT5 levels and activity, but no obvious metabolic abnormalities, neuropathology, or other gross phenotypes. We conclude that these human SIRT5 variants most likely represent severe hypomorphs, but are likely not by themselves the primary pathogenic cause of the neuropathology observed in the patients.

  • Organizational Affiliation

    Human and Animal Physiology, Wageningen University, De Elst 1, Wageningen, the Netherlands.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
NAD-dependent protein deacylase sirtuin-5, mitochondrial
A, B
271Homo sapiensMutation(s): 1 
Gene Names: SIRT5SIR2L5
EC: 2.3.1
UniProt & NIH Common Fund Data Resources
Find proteins for Q9NXA8 (Homo sapiens)
Explore Q9NXA8 
Go to UniProtKB:  Q9NXA8
GTEx:  ENSG00000124523 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9NXA8
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.70 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.184 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.017α = 90
b = 114.896β = 90.14
c = 56.265γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2024-06-05
    Type: Initial release
  • Version 1.1: 2024-06-19
    Changes: Database references