4-N-, 4-S-, and 4-O-Chloroquine Analogues: Influence of Side Chain Length and Quinolyl Nitrogen pKa on Activity vs Chloroquine Resistant Malaria
摘要:
Using predictions from heme-quinoline antimalarial complex structures, previous modifications of chloroquine (CQ), and hypotheses for chloroquine resistance (CQR), we synthesize and assay CQ analogues that test structure-function principles. We vary side chain length for both monoethyl and diethyl 4-N CQ derivatives. We alter the pK(a) of the quinolyl N by introducing alkylthio or alkoxy substituents into the 4 position and vary side chain length for these analogues. We introduce an additional titratable amino group to the side chain of 4-O analogues with promising CQR strain selectivity and increase activity while retaining selectivity. We solve atomic resolution structures for complexes formed between representative 4-N, 4-S, and 4-O derivatives vs mu-oxo dimeric heme, measure binding constants for monomeric vs dimeric heme, and quantify hemozoin (Hz) formation inhibition in vitro. The data provide additional insight for the design of CQ analogues with improved activity vs CQR malaria.
Antimalarial Quinolines and Methods of Use Thereof
申请人:Wolf Christian
公开号:US20110045100A1
公开(公告)日:2011-02-24
One aspect of the invention relates to substitute quinolines with antimalarial activity, and compositions and kits comprising at least one of them. Another aspect of the invention relates to methods for the treatment or prevention or both of malaria comprising administering to a subject a therapeutically effective amount of such a compound. Importantly, a number of the compounds show excellent potency against both chloroquine-sensitive and chloroquine-resistant strains.
[EN] ANTIMALARIAL QUINOLINES AND METHODS OF USE THEREOF<br/>[FR] QUINOLÉINES ANTIPALUDIQUES ET LEURS PROCÉDÉS D'UTILISATION
申请人:UNIV GEORGETOWN
公开号:WO2009148659A2
公开(公告)日:2009-12-10
One aspect of the invention relates to substitute quinolines with antimalarial activity, and compositions and kits comprising at least one of them. Another aspect of the invention relates to methods for the treatment or prevention or both of malaria comprising administering to a subject a therapeutically effective amount of such a compound. Importantly, a number of the compounds show excellent potency against both chloroquine-sensitive and chloroquine-resistant strains.
4-<i>N</i>-, 4-<i>S</i>-, and 4-<i>O</i>-Chloroquine Analogues: Influence of Side Chain Length and Quinolyl Nitrogen p<i>K</i><sub>a</sub> on Activity vs Chloroquine Resistant Malaria
作者:Jayakumar K. Natarajan、John N. Alumasa、Kimberly Yearick、Kekeli A. Ekoue-Kovi、Leah B. Casabianca、Angel C. de Dios、Christian Wolf、Paul D. Roepe
DOI:10.1021/jm701478a
日期:2008.6.1
Using predictions from heme-quinoline antimalarial complex structures, previous modifications of chloroquine (CQ), and hypotheses for chloroquine resistance (CQR), we synthesize and assay CQ analogues that test structure-function principles. We vary side chain length for both monoethyl and diethyl 4-N CQ derivatives. We alter the pK(a) of the quinolyl N by introducing alkylthio or alkoxy substituents into the 4 position and vary side chain length for these analogues. We introduce an additional titratable amino group to the side chain of 4-O analogues with promising CQR strain selectivity and increase activity while retaining selectivity. We solve atomic resolution structures for complexes formed between representative 4-N, 4-S, and 4-O derivatives vs mu-oxo dimeric heme, measure binding constants for monomeric vs dimeric heme, and quantify hemozoin (Hz) formation inhibition in vitro. The data provide additional insight for the design of CQ analogues with improved activity vs CQR malaria.