Puromycin N-acetyltransferase in complex with acetyl-CoA

Experimental Data Snapshot

  • Resolution: 2.31 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.237 

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Structure-guided selection of puromycin N-acetyltransferase mutants with enhanced selection stringency for deriving mammalian cell lines expressing recombinant proteins.

Caputo, A.T.Eder, O.M.Bereznakova, H.Pothuis, H.Ardevol, A.Newman, J.Nuttall, S.Peat, T.S.Adams, T.E.

(2021) Sci Rep 11: 5247-5247

  • DOI: https://doi.org/10.1038/s41598-021-84551-9
  • Primary Citation of Related Structures:  
    7K09, 7K0A

  • PubMed Abstract: 

    Puromycin and the Streptomyces alboniger-derived puromycin N-acetyltransferase (PAC) enzyme form a commonly used system for selecting stably transfected cultured cells. The crystal structure of PAC has been solved using X-ray crystallography, revealing it to be a member of the GCN5-related N-acetyltransferase (GNAT) family of acetyltransferases. Based on structures in complex with acetyl-CoA or the reaction products CoA and acetylated puromycin, four classes of mutations in and around the catalytic site were designed and tested for activity. Single-residue mutations were identified that displayed a range of enzymatic activities, from complete ablation to enhanced activity relative to wild-type (WT) PAC. Cell pools of stably transfected HEK293 cells derived using two PAC mutants with attenuated activity, Y30F and A142D, were found to secrete up to three-fold higher levels of a soluble, recombinant target protein than corresponding pools derived with the WT enzyme. A third mutant, Y171F, appeared to stabilise the intracellular turnover of PAC, resulting in an apparent loss of selection stringency. Our results indicate that the structure-guided manipulation of PAC function can be utilised to enhance selection stringency for the derivation of mammalian cell lines secreting elevated levels of recombinant proteins.

  • Organizational Affiliation

    Biomedical Manufacturing, Commonwealth Scientific and Industrial Research Organisation, 343 Royal Parade, Parkville, Victoria, 3052, Australia. alex.caputo@csiro.au.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Puromycin N-acetyltransferase
A, B, C, D, E
A, B, C, D, E, F
208Streptomyces albonigerMutation(s): 0 
Gene Names: pac
EC: 2.3
Find proteins for P13249 (Streptomyces alboniger)
Explore P13249 
Go to UniProtKB:  P13249
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP13249
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.31 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.237 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 149.074α = 90
b = 73.63β = 90
c = 106.242γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2021-03-17
    Type: Initial release
  • Version 1.1: 2023-10-18
    Changes: Data collection, Database references, Refinement description