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Cobra nerve growth factor: structure and evolutionary comparison.

M J Selby1, R H Edwards, W J Rutter

  • 1Hormone Research Institute, University of California, San Francisco 94143.

Journal of Neuroscience Research
|January 1, 1987
PubMed
Summary
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Researchers cloned and sequenced cobra venom gland Nerve Growth Factor (NGF) cDNA. The cobra NGF precursor structure is similar to mouse, with conserved mature NGF but variable non-NGF regions potentially encoding bioactive peptides.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Venomics

Background:

  • Nerve Growth Factor (NGF) is crucial for neuronal development and survival.
  • Cobra venom glands are a source of biologically active proteins, but their NGF precursor structure is largely uncharacterized.

Purpose of the Study:

  • To clone and sequence the Nerve Growth Factor (NGF) cDNA from the cobra venom gland.
  • To analyze the structural features of the cobra NGF precursor and compare it to known mammalian orthologs.

Main Methods:

  • cDNA cloning and sequencing of NGF from cobra venom gland.
  • Bioinformatic analysis of the predicted precursor protein structure.
  • Primer extension analysis to determine transcript abundance.

Main Results:

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  • The cobra NGF precursor shares structural similarities with the mouse prohormone, featuring a highly conserved mature NGF domain at the C-terminus.
  • The non-NGF moiety contains a putative signal peptide and conserved basic residues, suggesting proteolytic cleavage sites, while interstitial regions are poorly conserved.
  • Primer extension analysis revealed a single NGF transcript in the cobra venom gland.

Conclusions:

  • The conserved mature NGF domain suggests functional conservation across species.
  • The variable non-NGF moiety may play roles in precursor folding, proteolytic processing, or encode additional bioactive peptides.
  • A single NGF transcript indicates specific regulation of NGF expression in the cobra venom gland.