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Related Experiment Videos

Snake venom glutaminyl cyclase.

Joanna Pawlak1, R Manjunatha Kini

  • 1Department of Biological Sciences, Faculty of Science, National University of Singapore, Science Drive 4, Singapore 117543, Singapore.

Toxicon : Official Journal of the International Society on Toxinology
|July 26, 2006
PubMed
Summary

Glutaminyl cyclase (QC) is found in snake venom glands, not just the brain. This enzyme likely modifies snake venom toxins, potentially increasing their potency.

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Area of Science:

  • Biochemistry
  • Venomics
  • Molecular Biology

Background:

  • Glutaminyl cyclase (QC) is an enzyme crucial for modifying peptides, commonly found in brain tissue.
  • Many snake venom toxins, particularly three-finger toxins from Boiga species, feature N-terminal pyroglutamate.
  • The presence and function of QC in snake venom glands were previously uninvestigated.

Purpose of the Study:

  • To investigate the presence of Glutaminyl cyclase (QC) in the venom glands of Boiga snakes.
  • To determine if QC expressed in venom glands contributes to the modification of snake venom toxins.

Main Methods:

  • Obtained cDNA sequences for QC from both brain and venom gland tissues of Boiga dendrophila and Boiga irregularis.
  • Analyzed the expression and sequence of QC in different tissues.

Main Results:

  • Confirmed the presence of Glutaminyl cyclase (QC) cDNA sequences in both brain and venom gland tissues of the studied Boiga species.
  • Identified QC as a potential enzyme involved in venom toxin modification.

Conclusions:

  • Glutaminyl cyclase (QC) is expressed in snake venom glands.
  • QC in venom glands likely facilitates N-terminal pyroglutamate formation in snake venom toxins.
  • This enzymatic activity may indirectly enhance overall venom potency.

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