期刊
ACTA CRYSTALLOGRAPHICA SECTION D-STRUCTURAL BIOLOGY
卷 79, 期 -, 页码 518-530出版社
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S2059798323003613
关键词
amino-acid metabolism; cysteine synthase; PLP-dependent enzymes; X-ray crystallography; Chagas disease; leishmaniasis; Trypanosoma theileri; Trypanosoma cruzi; Leishmania infantum
Chagas disease and leishmaniasis are significant health problems caused by parasites. The study focuses on the cysteine biosynthesis pathway, which is essential for parasite survival. Crystal structures of cysteine synthase enzymes from Trypanosoma cruzi, Leishmania infantum, and T. theileri were determined, revealing the active site and potential binding sites for inhibitor design. These findings can aid in the development of new drugs and protein-protein inhibitors.
Chagas disease is a neglected tropical disease (NTD) caused by Trypanosoma cruzi, whilst leishmaniasis, which is caused by over 20 species of Leishmania, represents a group of NTDs endemic to most countries in the tropical and subtropical belt of the planet. These diseases remain a significant health problem both in endemic countries and globally. These parasites and other trypanosomatids, including T. theileri, a bovine pathogen, rely on cysteine biosynthesis for the production of trypanothione, which is essential for parasite survival in hosts. The de novo pathway of cysteine biosynthesis requires the conversion of O-acetyl-l-serine into l-cysteine, which is catalysed by cysteine synthase (CS). These enzymes present potential for drug development against T. cruzi, Leishmania spp. and T. theileri. To enable these possibilities, biochemical and crystallographic studies of CS from T. cruzi (TcCS), L. infantum (LiCS) and T. theileri (TthCS) were conducted. Crystal structures of the three enzymes were determined at resolutions of 1.80 angstrom for TcCS, 1.75 angstrom for LiCS and 2.75 angstrom for TthCS. These three homodimeric structures show the same overall fold and demonstrate that the active-site geometry is conserved, supporting a common reaction mechanism. Detailed structural analysis revealed reaction intermediates of the de novo pathway ranging from an apo structure of LiCS and holo structures of both TcCS and TthCS to the substrate-bound structure of TcCS. These structures will allow exploration of the active site for the design of novel inhibitors. Additionally, unexpected binding sites discovered at the dimer interface represent new potential for the development of protein-protein inhibitors.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据