Results 331 to 340 of about 6,455,122 (370)

Enzymes and Enzyme Activity Encoded by Nonenveloped Viruses

Annual Review of Virology, 2017
Viruses are obligate intracellular parasites that rely on host cell machineries for their replication and survival. Although viruses tend to make optimal use of the host cell protein repertoire, they need to encode essential enzymatic or effector functions that may not be available or accessible in the host cellular milieu.
Manidipa Banerjee, Kimi Azad, John E. Johnson   +2 more
openaire   +3 more sources

Multimodulation of Enzyme Activity

1981
Publisher Summary This chapter discusses the multimodulation of enzyme activity. Multimodulation of enzyme activity arises from the accumulation in a given enzyme of several regulatory mechanisms, whether of different types—cooperative, allosteric, interconversion, or of the same type—multiple allosteric effects, or of any combination of these ...
openaire   +3 more sources

Regulation of enzyme activity in adsorptive enzyme systems

Journal of Theoretical Biology, 1979
Abstract The kinetic behaviour of adsorptive enzyme systems with free and adsorbed enzyme forms in rapid equilibrium has been analysed. It has been shown that the dependences of enzymic reaction rate on substrate or “adsorptive effector” concentrations reveal the deviations from simple kinetic laws of Michaelis-Menten type (positive or negative ...
N.I. Loboda, B.I. Kurganov
openaire   +3 more sources

Enzymic Activities of Commercial Preparations of Pancreatic Enzymes

Scottish Medical Journal, 1977
The enzymic activities of 20 commercial pancreatic extracts have been measured by standard (F.I.P.) methods of assay and the activities have been compared with a standard preparation of pancreatin supplied by the British Pharmacopoeia Commission. A wide range of enzymic activities was found. The tabulated cost per unit of enzymic activities provides a
K. G. Wormsley, J. H. B. Saunders, Sheena Drummond, R. Leach   +3 more
openaire   +3 more sources

Measurement of Enzyme Activities

2017
The determination of enzyme activities in organ or organellar extracts is an important means of investigating metabolic networks and allows testing the success of enzyme-targeted genetic engineering. It also delivers information on intrinsic enzyme parameters such as kinetic properties or impact of effector molecules. This chapter provides protocols on
openaire   +3 more sources

Enzyme Activities in Human Liver

Enzymologia biologica et clinica, 1970
SummaryBiologic, technical, and methodic problems in the determination of enzyme activities in human hepatic tissue are evaluated critically and enzyme activities of normal liver, as well as their ...
E. Schmidt, F. W. Schmidt
openaire   +3 more sources

Purification and characterization of hepatocyte growth factor (HGF)-converting enzyme: activation of pro-HGF.

Biochemical and Biophysical Research Communications - BBRC, 1994
Hepatocyte growth factor (HGF) is a heterodimer protein, derived from an inactive single-chain precursor (pro-HGF) by the proteolytic cleavage at Arg-Val site.
K. Mizuno, Y. Tanoue, I. Okano, T. Harano, K. Takada, T. Nakamura   +5 more
semanticscholar   +1 more source

Molecular cloning of human D-dopachrome tautomerase cDNA: N-terminal proline is essential for enzyme activation.

Biochemical and Biophysical Research Communications - BBRC, 1998
D-Dopachrome tautomerase converts 2-carboxy-2,3-dihydroindole-5,6-quinone (D-dopachrome) into 5,6-dihydroxyindole. This protein has an amino acid sequence that is highly homologous with that of macrophage migration inhibitory factor (MIF), which has the ...
J. Nishihira, Mami Fujinaga, Takeshi Kuriyama, Masaki Suzuki, Hiroshi Sugimoto, Atsushi Nakagawa, Isao Tanaka, Masaharu Sakai   +7 more
semanticscholar   +1 more source

Measurement of Enzyme Activity

1982
Most people approaching the problem of enzyme purification will be following a standard procedure for measuring enzyme activity. But in some cases, it may be useful to develop an alternative assay, for instance, a rapid spectrophotometric method to avoid queuing for the use of a scintillation counter.
openaire   +2 more sources

Measuring the Enzyme Activity of Arabidopsis Deubiquitylating Enzymes

2016
Deubiquitylating enzymes, or DUBs, are important regulators of ubiquitin homeostasis and substrate stability, though the molecular mechanisms of most of the DUBs in plants are not yet understood. As different ubiquitin chain types are implicated in different biological pathways, it is important to analyze the enzyme characteristic for studying a DUB ...
Kamila Kalinowska, Erika Isono, Marie-Kristin Nagel   +2 more
openaire   +3 more sources