Binding Mechanism between Platelet Glycoprotein and Cyclic Peptide Elucidated by McMD-Based Dynamic Docking.
J Chem Inf Model
; 64(10): 4158-4167, 2024 May 27.
Article
em En
| MEDLINE
| ID: mdl-38751042
ABSTRACT
The cyclic peptide OS1 (amino acid sequence CTERMALHNLC), which has a disulfide bond between both termini cysteine residues, inhibits complex formation between the platelet glycoprotein Ibα (GPIbα) and the von Willebrand factor (vWF) by forming a complex with GPIbα. To study the binding mechanism between GPIbα and OS1 and, therefore, the inhibition mechanism of the protein-protein GPIbα-vWF complex, we have applied our multicanonical molecular dynamics (McMD)-based dynamic docking protocol starting from the unbound state of the peptide. Our simulations have reproduced the experimental complex structure, although the top-ranking structure was an intermediary one, where the peptide was bound in the same location as in the experimental structure; however, the ß-switch of GPIbα attained a different conformation. Our analysis showed that subsequent refolding of the ß-switch results in a more stable binding configuration, although the transition to the native configuration appears to take some time, during which OS1 could dissociate. Our results show that conformational changes in the ß-switch are crucial for successful binding of OS1. Furthermore, we identified several allosteric binding sites of GPIbα that might also interfere with vWF binding, and optimization of the peptide to target these allosteric sites might lead to a more effective inhibitor, as these are not dependent on the ß-switch conformation.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Peptídeos Cíclicos
/
Ligação Proteica
/
Complexo Glicoproteico GPIb-IX de Plaquetas
/
Simulação de Dinâmica Molecular
/
Simulação de Acoplamento Molecular
Limite:
Humans
Idioma:
En
Revista:
J Chem Inf Model
Ano de publicação:
2024
Tipo de documento:
Article