Background: Cobra venom consists of diverse toxin homologues important for prey capture through variable levels of gene duplication. Results: Comparative structural and cellular investigations revealed sensitivity of toxin homologues for extra-and intracellular targets via sulfated glycoconjugates. Conclusion: Variation in positively charged and hydrophobic domains in CTX homologues altered their target specificities and endocytosis. Significance: We provide a rationale for toxin homologues at cellular level to gain an evolutionary advantage.
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