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Profiling Esterases in Mycobacterium tuberculosis Using Far-Red Fluorogenic Substrates.

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New fluorogenic probes targeting Mycobacterium tuberculosis (Mtb) esterases and lipases show improved stability and reactivity. These probes identified a novel Mtb-specific enzyme, Culp1, active during infection.

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Area of Science:

  • Biochemistry
  • Microbiology
  • Chemical Biology

Background:

  • Fluorogenic probes are essential for studying bacterial pathogens like Mycobacterium tuberculosis (Mtb).
  • Previous work developed DDAO-derived acetoxymethyl ether probes for esterase and lipase detection in Mtb.

Purpose of the Study:

  • To develop and characterize novel, longer-chain fluorogenic probes (C4 and C8) for enhanced detection of Mtb esterases and lipases.
  • To profile Mtb esterases and lipases using these new probes and identify Mtb-specific enzymes.

Main Methods:

  • Synthesis of four-carbon (C4) and eight-carbon (C8) acyloxymethyl ether derivatives of DDAO.
  • Application of C4 and C8 probes to profile esterases and lipases in Mtb lysates.
  • Gel electrophoresis and analysis of Mtb lysates to identify specific enzyme bands.
  • Identification of the Mtb-specific esterase as Culp1 (Rv1984c).
  • Testing probe performance in lysates from Mtb-infected macrophages.

Main Results:

  • C4 and C8 probes exhibited greater stability and lipase reactivity compared to existing C2 probes.
  • A novel esterase band, absent in M. bovis, was detected in Mtb lysates using C8 probes.
  • This Mtb-specific enzyme was identified as the secreted esterase Culp1 (Rv1984c).
  • Distinct Mtb banding patterns were observed in Mtb-infected macrophage lysates, indicating probe utility during infection.

Conclusions:

  • Novel C4 and C8 fluorogenic probes offer enhanced stability and reactivity for studying Mtb enzymes.
  • These probes facilitate the discovery and identification of Mtb-specific enzymes like Culp1.
  • The probes show potential for detecting active Mtb esterases during host infections.