A bactericide peptide changing the static and dilatational surface elasticity properties of zwitterionic lipids at the air-water interface: Relationship with the thermodynamic, structural and morphological properties

Autor(es)

Santana, Heung Jin Alves ^[1] ; Caseli, Luciano ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Paulo, Dept Chem, Diadema, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Biophysical Chemistry; v. 277, OCT 2021.
• Citações Web of Science: 2

Resumo

In this paper, we studied how different hydrophilicity degrees of the polar groups of the lipids dipalmitoylphosphatidylcholine (DPPC) and dipalmitoyl phosphatidylethanolamine (DPPE) influence the interaction of the antibiotic peptide vancomycin (VC), affecting the physicochemical properties of the monolayers, including thermodynamic, rheological, structural and morphological ones. Lipid Langmuir monolayers were prepared at air-water interfaces with VC aqueous solution as subphase and characterized with tensiometry, Brewster angle microscopy, infrared spectroscopy, dilatational, and interfacial shear rheology. The presence of PC or PE groups as polar head groups of the phospholipid monolayers modulated the interaction of VC adsorbing from the aqueous subphase since for DPPC, vancomycin condenses the monolayer, making it less stable, fluid, and more disordered. In contrast, for DPPE, vancomycin expands the monolayer, making it more stable, keeping the compressibility, and leading to the formation of interfacial aggregates, which are not observed for DPPC. We concluded thatelectrostatic interactions induced the insertion of the peptide into the polar heads of the monolayers (DPPE), while hydrophobic interactions, in addition to ion-dipole interactions, induced the adsorption of the peptide onto the polar head of the monolayers (DPPC). (AU)

• Processo FAPESP: 19/03239-0 - Interfaces nanoestruturadas para a investigação de substâncias bioativas em modelos de membrana celular e para a construção de dispositivos optoeletrônicos enzimáticos
• Beneficiário: Luciano Caseli
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 18/22214-6 - Rumo à convergência de tecnologias: de sensores e biossensores à visualização de informação e aprendizado de máquina para análise de dados em diagnóstico clínico
• Beneficiário: Osvaldo Novais de Oliveira Junior
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 19/04402-2 - Estudo da interação do glicopeptídeo vancomicina com modelos de membrana celular formados por filmes de Langmuir de lipídios
• Beneficiário: Heung Jin Alves Santana
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica