An action for various peptides and a kinetic study for amino acid p-nitroanilides (pNAs) and 4-methylcoumaryl-7-amides (MCAs) were performed with purified aminopeptidase from the mid-gut of the scallop. The enzyme preferred dipeptides having Ala, Met, and Phe in the amino-terminal or the penultimate position from the amino-termini. The catalytic efficiencies, kcat⁄Km values for Ala-pNA and MCA were the highest in the tested substrates, and those for pNA and MCA substrates having Met or Phe were the next highest. The enzyme was found to be a new alanine-specific aminopeptidase.
The identification of inhibitory compounds of Rickettsia prowazekii methionine aminopeptidase for antibacterial applications
作者:Travis R. Helgren、Elif S. Seven、Congling Chen、Thomas E. Edwards、Bart L. Staker、Jan Abendroth、Peter J. Myler、James R. Horn、Timothy J. Hagen
DOI:10.1016/j.bmcl.2018.03.002
日期:2018.5
The compounds were first screened against the target at a concentration of 10 µM and potential hits were determined to be those exhibiting greater than 50% inhibition of enzymatic activity. These hit compounds were then rescreened against the target in 8-point dose–response curves and 11 compounds were found to inhibit enzymatic activity with IC50 values of less than 10 µM. Finally, compounds (1–5)
Mutations of key substrate binding residues of leishmanial peptidase T alter its functional and structural dynamics
作者:Saleem Yousuf Bhat、Insaf Ahmed Qureshi
DOI:10.1016/j.bbagen.2019.129465
日期:2020.1
carries broad substrate specificity with best cleavage preference for peptides carrying alanine at the P1 position. Peptidomimetics amastatin and actinonin occupied S1 pocket by competing with the substrate for binding to activesite and inhibited PepT potently, while arphamenine A and bestatin were less effective inhibitors. We further show that the mutation of conserved substratebinding residues (T364
Structural and functional highlights of methionine aminopeptidase 2 from Leishmania donovani
作者:Saleem Yousuf Bhat、Arijit Dey、Insaf A. Qureshi
DOI:10.1016/j.ijbiomac.2018.04.090
日期:2018.8
a Ki value of 0.86 μM. Further, structural studies with circulardichroism (CD) showed an increase in the α-helical and β-sheet contents and a decrease in random coils in LdMAP2 upon interactions with both bestatin and fluorogenic substrates. Finally, structural studies pointed out key differences in the structure of LdMAP2 and HsMAP2 and their interactions with inhibitor bestatin, Ala-AMC, Leu-AMC
蛋氨酸氨基肽酶2(MAP2)是多形利什曼原虫凋亡的主要调节剂,也是新型抗疟原虫药的设计和合成的潜在候选者。将LdMAP2基因克隆到pET28a(+)-SUMO载体中,在大肠杆菌中表达,然后通过色谱法纯化。发现它是一种单体,并且由于其对合成底物的活性具有二价金属离子,其中Co(II),Mg(II),Mn(II)和Ni(II)是主要的活化剂。此外,Ca(II)显示出最紧密的结合,K m值为124.7±9.2μM,而Co(II)被证明是最有效的催化方法,k cat值为128.1±4 min -1。发现天然存在的氨基肽酶B抑制剂Bestatin是具有K i的LdMAP2的有效抑制剂。值为0.86μM。此外,具有圆二色性(CD)的结构研究表明,与Bestatin和荧光底物相互作用时,LdMAP2中的α-螺旋和β-折叠含量增加,而无规卷曲减少。最后,结构研究指出了LdMAP2和HsMAP2在结构上的关