Abstract
Venoms have recently emerged as a promising field in drug discovery due to their good selectivity and affinity for a wide range of biological targets. Among their multiple potential applications, venoms are a rich source of blood-brain barrier (BBB) peptide shuttles. We previously described a short nontoxic derivative of apamin, MiniAp-4, which can transport a wide range of cargoes across the BBB. Here, we have studied the conformation of the proline residue of a range of MiniAp-4 analogues by high-field NMR techniques, with the aim to identify whether there is a direct relation between the cis/trans population and a range of features, such as the capacity to transport molecules across a human-based cellular model and stability in various media. The most promising candidate showed improved transport properties for a relevant small fluorophore.
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