DD04107-Derived neuronal exocytosis inhibitor peptides: Evidences for synaptotagmin-1 as a putative target

Butrón D. ; Zamora-Carreras H. ; Devesa I. ; Treviño M.A. ; Abian O. (Universidad de Zaragoza) ; Velázquez-Campoy A. (Universidad de Zaragoza) ; Bonache M.Á. ; Lagartera L. ; Martín-Martínez M. ; González-Rodríguez S. ; Baamonde A. ; Fernández-Carvajal A. ; Ferrer-Montiel A. ; Jiménez M.Á. ; González-Muñiz R.

Resumen: The analgesic peptide DD04107 (Pal-EEMQRR-NH2) and its acetylated analogue inhibit a-calcitonin gene-related peptide (a-CGRP) exocytotic release from primary sensory neurons. Examining the crystal structure of the SNARE-Synaptotagmin-1(Syt1) complex, we hypothesized that these peptides could inhibit neuronal exocytosis by binding to Syt1, hampering at least partially its interaction with the SNARE complex. To address this hypothesis, we first interrogate the role of individual side-chains on the inhibition of a-CGRP release, finding that E1, M3, Q4 and R6 residues were crucial for activity. CD and NMR conformational analysis showed that linear peptides have tendency to adopt a-helical conformations, but the results with cyclic analogues indicated that this secondary structure is not needed for activity. Isothermal titration calorimetry (ITC) measurements demonstrate a direct interaction of some of these peptides with Syt1-C2B domain, but not with Syt7-C2B region, indicating selectivity. As expected for a compound able to inhibit a-CGRP release, cyclic peptide derivative Pal-E-cyclo[EMQK]R-NH2 showed potent in vivo analgesic activity, in a model of inflammatory pain. Molecular dynamics simulations provided a model consistent with KD values for the interaction of peptides with Syt1-C2B domain, and with their biological activity. Altogether, these results identify Syt1 as a potential new analgesic target. © 2021

Idioma: Inglés

DOI: 10.1016/j.bioorg.2021.105231

Año: 2021

Publicado en: Bioorganic Chemistry 115 (2021), 105231
ISSN: 0045-2068

Factor impacto JCR: 5.307 (2021)

Categ. JCR: CHEMISTRY, ORGANIC rank: 8 / 57 = 0.14 (2021) - Q1 - T1
Categ. JCR: BIOCHEMISTRY & MOLECULAR BIOLOGY rank: 99 / 297 = 0.333 (2021) - Q2 - T2

Factor impacto CITESCORE: 7.1 - Pharmacology, Toxicology and Pharmaceutics (Q1) - Biochemistry, Genetics and Molecular Biology (Q2)

Factor impacto SCIMAGO: 0.728 - Biochemistry (Q2) - Molecular Biology (Q2) - Drug Discovery (Q2)

Tipo y forma: Article (Published version)

Área (Departamento): Área Bioquímica y Biolog.Mole. (Dpto. Bioq.Biolog.Mol. Celular)