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Justin D Radolf1, Daniel C Desrosiers

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Area of Science:

  • Microbiology
  • Pathogen Biology
  • Molecular Biology

Background:

  • Treponema pallidum is a stealth pathogen causing persistent infections.
  • Immune evasion strategies of T. pallidum include antigenic variation.
  • TP0262 is a T. pallidum protein homologous to E. coli cAMP regulatory protein (CRP).

Purpose of the Study:

  • To investigate the function of TP0262 in T. pallidum.
  • To determine if TP0262 acts as a transcription factor.
  • To explore the role of TP0262 in immune evasion.

Main Methods:

  • Sequence analysis to identify CRP binding motifs.
  • Electrophoretic mobility shift assay (EMSA).
  • DNaseI footprinting.
  • E. coli-based reporter gene system.

Main Results:

  • TP0262 specifically binds to sequences upstream of tprE, tprG, and tprJ.
  • DNA binding by TP0262 is dependent on cyclic AMP (cAMP).
  • TP0262 functions as a cAMP-dependent transcription factor.

Conclusions:

  • T. pallidum utilizes a CRP orthologue (TP0262) for gene regulation.
  • This regulatory mechanism likely contributes to T. pallidum's immune evasion.
  • The study provides methodological advances for syphilis research.