The Inhibitory Effect of GlmU Acetyltransferase Inhibitor TPSA on Mycobacterium tuberculosis May Be Affected Due to Its Methylation by Methyltransferase Rv0560c

被引：14

作者：

Chen, Changming ^{[1
]}

Han, Xiuyan ^{[1
]}

Yan, Qiulong ^{[2
]}

Wang, Chao ^{[3
]}

Jia, Liqiu ^{[1
]}

Taj, Ayaz ^{[1
]}

Zhao, Lizhe ^{[1
]}

Ma, Yufang ^{[1
,2
]}

机构：

[1] Dalian Med Univ, Dept Biochem & Mol Biol, Coll Basic Med Sci, Dalian, Peoples R China

[2] Dalian Med Univ, Dept Microbiol, Coll Basic Med Sci, Dalian, Peoples R China

[3] Dalian Med Univ, Coll Pharm, Dalian, Peoples R China

来源：

FRONTIERS IN CELLULAR AND INFECTION MICROBIOLOGY | 2019年 / 9卷

基金：

中国国家自然科学基金;

关键词：

Mycobacteria tuberculosis; UDP-GlcNAc; GlmU acetyltransferase; inhibitor; methyltransferases; SMALL-MOLECULE INHIBITORS; N-ACETYLGLUCOSAMINE-1-PHOSPHATE URIDYLTRANSFERASE; DRUG-RESISTANCE; IN-VITRO; IDENTIFICATION; EXPRESSION; ESSENTIALITY; BIOGENESIS; ENVELOPE; GENES;

D O I：

10.3389/fcimb.2019.00251

中图分类号：

R392 [医学免疫学]; Q939.91 [免疫学];

学科分类号：

100102 ;

摘要：

Mycobacterium tuberculosis bifunctional enzyme GlmU is a novel target for anti-TB drugs and is involved in glycosyl donor UDP-N-acetylglucosamine biosynthesis. Here, we found that TPSA (2-[5-(2-{[4-(2-thienyl)-2-pyrimidinyl]sulfanyl}acetyl)-2-thienyl]acetic acid) was a novel inhibitor for GlmU acetyltransferase activity (IC50: 5.3 mu M). The interaction sites of GlmU and TPSA by molecular docking were confirmed by site-directed mutagenesis. TPSA showed an inhibitory effect on Mtb H37Ra growth and intracellular H37Ra in macrophage cells (MIC: 66.5 mu M). To investigate why TPSA at a higher concentration (66.5 mu M) was able to inhibit H37Ra growth, proteome and transcriptome of H37Ra treated with TPSA were analyzed. The expression of two methyltransferases MRA_0565 (Rv0558) and MRA_0567 (Rv0560c) were markedly increased. TPSA was pre-incubated with purified Rv0558 and Rv0560c in the presence of S-adenosylmethionine (methyl donor) respectively, resulting in its decreased inhibitory effect of GlmU on acetyltransferase activity. The inhibition of TPSA on growth of H37Ra with overexpressed Rv0558 and Rv0560c was reduced. These implied that methyltransferases could modify TPSA. The methylation of TPSA catalyzed by Rv0560c was subsequently confirmed by LC-MS. Therefore, TPSA as a GlmU acetyltransferase activity inhibitor may offer a structural basis for new anti-tuberculosis drugs. TPSA needs to be modified further by some groups to prevent its methylation by methyltransferases.

引用

页数：15