Crystal structure of TpPta, a phosphotransacetylase from Treponema pallidum

Experimental Data Snapshot

  • Resolution: 1.95 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.181 

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Biophysical and biochemical studies support TP0094 as a phosphotransacetylase in an acetogenic energy-conservation pathway in Treponema pallidum.

Brautigam, C.A.Deka, R.K.Tso, S.C.Liu, W.Z.Norgard, M.V.

(2023) PLoS One 18: e0283952-e0283952

  • DOI: https://doi.org/10.1371/journal.pone.0283952
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The mechanisms of energy generation and carbon-source utilization in the syphilis spirochete Treponema pallidum have remained enigmatic despite complete genomic sequence information. Whereas the bacterium harbors enzymes for glycolysis, the apparatus for more efficient use of glucose catabolites, namely the citric-acid cycle, is apparently not present. Yet, the organism's energy needs likely exceed the modest output from glycolysis alone. Recently, building on our structure-function studies of T. pallidum lipoproteins, we proposed a "flavin-centric" metabolic lifestyle for the organism that partially resolves this conundrum. As a part of the hypothesis, we have proposed that T. pallidum contains an acetogenic energy-conservation pathway that catabolizes D-lactate, yielding acetate, reducing equivalents for the generation and maintenance of chemiosmotic potential, and ATP. We already have confirmed the D-lactate dehydrogenase activity in T. pallidum necessary for this pathway to operate. In the current study, we focused on another enzyme ostensibly involved in treponemal acetogenesis, phosphotransacetylase (Pta). This enzyme is putatively identified as TP0094 and, in this study, we determined a high-resolution (1.95 Å) X-ray crystal structure of the protein, finding that its fold comports with other known Pta enzymes. Further studies on its solution behavior and enzyme activity confirmed that it has the properties of a Pta. These results are consistent with the proposed acetogenesis pathway in T. pallidum, and we propose that the protein be referred to henceforth as TpPta.

  • Organizational Affiliation

    Department of Biophysics, UT Southwestern Medical Center, Dallas, Texas, United States of America.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Phosphate acetyltransferase
A, B
355Treponema pallidumMutation(s): 0 
Gene Names: ptaFA889_00490
Find proteins for O83132 (Treponema pallidum (strain Nichols))
Explore O83132 
Go to UniProtKB:  O83132
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO83132
Sequence Annotations
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Resolution: 1.95 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.181 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 66.195α = 90
b = 66.195β = 90
c = 337.642γ = 120
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 Allergy and Infectious Diseases (NIH/NIAID)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2023-05-31
    Type: Initial release