Ontology highlight
ABSTRACT:
SUBMITTER: Li X
PROVIDER: S-EPMC6099853 | biostudies-other | 2018 Aug
REPOSITORIES: biostudies-other
Li Xiang X Jiang Yu Y Chong Shaorong S Walt David R DR
Proceedings of the National Academy of Sciences of the United States of America 20180730 33
In this paper, we report an example of the engineered expression of tetrameric β-galactosidase (β-gal) containing varying numbers of active monomers. Specifically, by combining wild-type and single-nucleotide polymorphism plasmids at varying ratios, tetrameric β-gal was expressed in vitro with one to four active monomers. The kinetics of individual enzyme molecules revealed four distinct populations, corresponding to the number of active monomers in the enzyme. Using single-molecule-level enzyme ...[more]