BtRgl9B（Rhamnogalacturonan lyase）
BtRgl9B
En-Rgl0180
(EC. 4.2.2.23) Rhamnogalacturonan lyase
CAZy Family: PL9
PROPERTIES
1. ELECTROPHORETIC PURITY
-Single band on SDS-gel electrophoresis (MW ~47 kDa)
Figure 1. Electrophoresis analysis of BtRgl9B. M, molecular weight marker (PageRuler Prestained Protein Ladder, Thermo Scientific); lane 1, culture lysate before IPTG induction; lane 2, culture lysate after IPTG induction; lane 3, BtRgl9B purified from Ni sepharose fast flow column.
2. SPECIFIC ACTIVITY
2.0 U/mg protein (on RG-I-AT from Adenophora tetraphylla(Thunb.)Fisch.) at pH 8.0 and 37°C.
One unit of RGL activity was defined as the amount of enzyme required to generate 1 mmol of 4,5-unsaturated galacturonic acid in 1 min.
3. RELATIVE RATES OF HYDROLYSIS OF SUBSTRATES
Table 1 Activity of BtRgl9B
Substrate |
kcat(min-1) |
Km (mM) |
kcat/Km (mM-1min-1) |
AM-RG-I |
174.1 ± 5.0 |
0.020 ± 0.002 |
8.8 x 103 ± 1.2 x 103 |
Sugar beet arabinan |
350.1 ± 10.2 |
0.059 ± 0.005 |
6.0 x 103 ± 706 |
P-RG-I |
NA |
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4. PHYSICOCHEMICAL PROPERTIES
pH Optima: 7.5
Temperature Optima: 37°C
Figure 2. Effect of pH on the activity of recombinant BtRgl9B. Assays were carried out at 37°C for 10 min in buffers ranging in pH from 5.5 to 11.0. The activity at optimum pH was defifined as 100%.
5. STORAGE CONDITIONS
The enzyme should be stored at -20°C. For assay, this enzyme should be diluted in phosphate buffer (50 mM) pH 8.0. Swirl to mix the enzyme immediately prior to use.
6. REFERENCE
[1] Luís A S. Microbial pectin recognition and utilization of the mammalian gastrointestinal tract[D]. Newcastle University, 2017.
