Bottom-Up Construction of an Adaptive Enzymatic Reaction Network
作者:Britta Helwig、Bob van Sluijs、Aleksandr A. Pogodaev、Sjoerd G. J. Postma、Wilhelm T. S. Huck
DOI:10.1002/anie.201806944
日期:2018.10.22
behaviors in nature using reaction networks is an important objective in synthetic biology and systems chemistry. Herein, the first experimental realization of an enzymatic reaction network capable of an adaptive response is reported. The design is based on the dual activity of trypsin, which activates chymotrypsin while at the same time generating a fluorescent output from a fluorogenic substrate. Once activated
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
Human laeverin/aminopeptidase Q (APQ) is a novel member of the M1 family of zinc aminopeptidases and is specifically expressed on the cell surface of extravillous trophoblasts. In this study, we examined the significance of Gln-238 of laeverin/APQ, a putative S1 site residue, by site-directed mutagenesis for its enzymatic activity and substrate specificity. Replacement of Gln-238 with Ala caused a significant change in substrate specificity rather than a decrease in enzymatic activity. These results indicate that Gln-238 is important for the substrate specificity of laeverin/APQ. In addition, our data suggest that direct electrostatic interaction between substrate and S1 site of the enzyme is not involved in the mutant enzyme's preference for basic amino acids.
Modification of Low-Energy Surfaces Using Bicyclic Peptides Discovered by Phage Display
作者:Lingxiao Wang、Haodong Li、Xinyan Wang、Xichu Yang、Changlin Tian、Demeng Sun、Lei Liu、Jinghong Li
DOI:10.1021/jacs.3c02943
日期:2023.8.16
find that the enrichment properties of bicyclic peptides capable of binding to polypropylene are distinct from linear peptides, as reflected in amino acid abundance and a trend toward negative net charges and high hydrophobicity. The selected bicyclic peptide has a higher binding affinity for polypropylene compared with a previously reported linear peptide, enabling the hydrophilic and adhesive properties
Method of measuring the number of cells of microorganisms
申请人:AJINOMOTO CO., INC.
公开号:EP0122148A1
公开(公告)日:1984-10-17
A method of measuring the number of microorganism cells in a sample which comprises preparing a solution or suspension containing a sample of a medicine, food, drink, cosmetic or water, adding to said solution or suspension a 7-amino-4-methyl-coumarin derivative represented by formula (1):
wherein R is an alkyl group, an allyl group, an aralkyl group, or a heterocyclic group, or R-CO- is an amino acid or peptide residue, said derivative not inhibiting the hydrolysis of the amine bond of formula (1) by microorganism hydrolases contained in the samples; and measuring the fluorescence of 7-amino-4--methyl-coumarin released by the microorganism hydrolases.
一种测量样品中微生物细胞数量的方法,包括制备含有药物、食品、饮料、化妆品或水样品的溶液或悬浮液,向所述溶液或悬浮液中加入由式(1)代表的7-氨基-4-甲基香豆素衍生物:
其中 R 是烷基、烯丙基、芳烷基或杂环基,或 R-CO- 是氨基酸或肽残基,所述衍生物不抑制样品中含有的微生物水解酶水解式(1)的胺键;以及测量微生物水解酶释放的 7-氨基-4-甲基香豆素的荧光。