Excess of threonine compared with serine promotes threonine aldolase activity in Lactococcus lactis IL1403
نویسندگان
چکیده
منابع مشابه
Bacterial Threonine Aldolase and Serine Hydroxymethyltransferase Enzymes
for the enzyme in vivo unless an alkaline micro-environment was postulated or conditions were present in vivo which could potentiate inhibition by UMP at near-neutral pH (Yon, 19726). Substances such as deoxycholate which can bind to the hydrophobic site on the enzyme may provide such potentiation. Fig. 2 shows the effects of UMP and deoxycholate at pH values between 7 and 11. In the absence of...
متن کاملEnzymatic Breakdown of Threonine by Threonine Aldolase
1. The enzyme which splits threonine to acetaldehyde and glycine has been partially purified from rat liver (five- to sixfold purification) and the name threonine aldolase proposed for it. 2. The general properties of threonine aldolase have been studied. The enzyme is unstable to a pH below 5. The pH optimum of the enzyme reaction is at 7.5-7.7. The initial rate of production of acetaldehyde i...
متن کاملSerine/threonine protein phosphatases.
1 (1-1) and inhibitor-2 (1-2), and preferentially dephosphorylate the /3-subunit of phosphorylase kinase, whereas type-2 phosphatases are insensitive to the heat-stable inhibitors and preferentially dephosphorylate the x-subunit of phosphorylase kinase [1,2]. Type-2 phosphatases can be further subdivided into spontaneously active (PP2A), Ca2l-dependent (PP2B) and Mg2+dependent (PP2C) classes. T...
متن کاملSerine/Threonine Response Elements
T RANSCRIPTION in eukaryotes involves transcriptional activators, proteins that bind to specific sites distal from the TATA box termed enhancers or u p stream activation sequences (UASs) . When bound to a UAS, a transcriptional activator is able to stimulate the transcription initiation complex leading to synthesis of the mRNA. The ability of Saccharomyces cermisiar to use serine or threonine a...
متن کاملMolecular physiology of sugar catabolism in Lactococcus lactis IL1403.
The metabolic characteristics of Lactococcus lactis IL1403 were examined on two different growth media with respect to the physiological response to two sugars, glucose and galactose. Analysis of specific metabolic rates indicated that despite significant variations in the rates of both growth and sugar consumption, homolactic fermentation was maintained for all cultures due to the low concentr...
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ژورنال
عنوان ژورنال: Microbiology
سال: 2015
ISSN: 1350-0872,1465-2080
DOI: 10.1099/mic.0.000071