Structure-activity relationships of P-glycoprotein interacting drugs: kinetic characterization of their effects on ATPase activity.
Biochim Biophys Acta
; 1361(2): 159-68, 1997 Aug 22.
Article
em En
| MEDLINE
| ID: mdl-9300797
ABSTRACT
We have determined the kinetic parameters for stimulation and inhibition by 34 drugs of the P-glycoprotein ATPase in membranes derived from CR1R12 Chinese hamster ovary cells. The drugs chosen were sets of calmodulin antagonists, steroids, hydrophobic cations, hydrophobic peptides, chemotherapeutic substrates of P-glycoprotein, and some other drugs with lower affinity for P-glycoprotein. We studied how these kinetic parameters correlated with the partition coefficient and the Van der Waals surface area of the drugs. The maximum velocity of ATPase stimulation decreased with surface area and showed a suggestion of a maximum with increasing partition coefficient. The affinity of these drugs for P-glycoprotein showed no significant correlation with partition coefficient but was highly correlated with the surface area suggesting that binding between modulators and P-glycoprotein takes place across a wide interaction surface on the protein.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Adenosina Trifosfatases
/
Membro 1 da Subfamília B de Cassetes de Ligação de ATP
/
Resistência a Múltiplos Medicamentos
Limite:
Animals
Idioma:
En
Ano de publicação:
1997
Tipo de documento:
Article