The Rate of Hydrolysis of Sucrose

Hydrolysis rate of sucrose hypothesis - Digestion of sucrose into glucose and fructose is done by the presence of enzyme sucrase. Since the tertiary structure of the enzyme is correct at this temperature, the activity of the enzyme is greatest at its optimal temperature, as it enables the substrate-enzyme complex to be formed rapidly and efficiently. It must be 37 ° C (body temperature). This is the temperature of the ileum where sucrase secretes and functions naturally.

The sacB gene encoding levansucrase in Bacillus subtilis has been used as a tool for positive selection. The enzyme levansucrase catalyzes lactation from sucrose to various receptors, resulting in the hydrolysis of sucrose and the synthesis of levan which is toxic to cells. Expression of the sacB gene in the presence of 5% sucrose in agar media has been reported to be lethal for a variety of bacteria including E. coli, Agrobacterium tumefaciens and Rhizobium meliloti. In this study, we found that Xcc 8004 strain expressing sacB gene can not survive at the same sucrose concentration like these bacteria. Therefore, we actively used the sacB gene to screen for candidates regulating the expression of hrpX. Briefly, we first constructed the recombinant plasmid pL6hrpXsacB (Table 1) by cloning the sacB gene into the broad host range plasmid pLAFR6 (Table 1). Here the sacB gene was driven by the hrpX promoter. Strain ΔhrpG / pL 6 hrp X sac B) (FIGS. 1 a and d)

RpfC regulates the expression of hrpX, an important regulator of the hrp / T3SS system in Xanthomonas campestris pv. rape

Figure 1. In the left panel, the data in Colwill and Rescorla (1985b, Experiment 1) was redrawn whether or not sucrose or particle enhancer was used and the response rate after 20 minutes regression was shown . The pair (P) is paired with lithium chloride (NP). The graph on the right shows the unresponsive reaction response rate (labeled NP in the left panel) of sucrose or particles after pairing with lithium chloride in the whole regression process (function labeled P on the left panel) It is. function). The ratio of the unpaired control rate of sucrose is greater than that of pellets

Sucrose synthase is an important enzyme in sucrose metabolism in plant cells. (Persia et al., 2008) It is generally known that the main route of entry of carbon from sucrose is sucrose synthase. (Bieniawska et al., 2007) This carbon is used for the synthesis of respiratory and cell wall polymers and starch. (Persia et al., 2008) The main form of plant carbon reduction is sucrose. It is used to support growth and synthesis of raw materials such as heterotrophic sink tissue starch. (Matic et al., 2004) UDP-glucose provided by sucrose synthase is used for cell wall biosynthesis when used with cellulose synthase complex. (Baud, Vaultier and Rochat, 2004) In most fruit tissues, an increase in sucrose synthase activity occurs simultaneously with sucrose accumulation. This indicates that sucrose synthase plays an important role in physiology. Subsequent cleavage of the sucrose in the tissue is the first step in its use in various metabolic pathways.