血红素
青蒿素
恶性疟原虫
双氢青蒿素
化学
生物化学
体外
药品
药理学
生物
疟疾
血红素
免疫学
酶
作者
Jamaree Bhisutthibhan,Xing-Qing Pan,Paul A. Hossler,Daniel J. Walker,Charles A. Yowell,Jane M. Carlton,John B. Dame,Steven R. Meshnick
标识
DOI:10.1074/jbc.273.26.16192
摘要
Artemisinin and its derivatives are important new antimalarial drugs. When Plasmodium falciparum-infected erythrocytes are incubated with [10-3H]dihydroartemisinin, several malaria-specific proteins become labeled. One of these proteins is the P. falciparum translationally controlled tumor protein (TCTP) homolog. In vitro, dihydroartemisinin reacts covalently with recombinant TCTP in the presence of hemin. The association between drug and protein increases with increasing drug concentration, plateauing at approximately 1 drug/TCTP molecule. By Scatchard analysis, there appear to be 2 hemin binding sites on TCTP with dissociation constants of ∼18 μm. When the single cysteine moiety is blocked by pretreatment with iodoacetamide, hemin binding is not affected, whereas drug binding is reduced by two-thirds. Thus, TCTP reacts with artemisinin in situ and in vitro in the presence of hemin and appears to bind to hemin. The function of the malarial TCTP and the role of this reaction in the mechanism of action of artemisinin await elucidation.
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