Abstract
The cellulosomal enzyme, RfGH51/2, of Ruminococcus flavefaciens contains an N-terminal module, a family 5 glycoside hydrolase GH5_4 with a putative endoglucanase activity, while C-terminal domain is a putative endo-mannanase (GH5_7). The two putative catalytic modules are separated by family 80 carbohydrate binding module (CBM80) having wide ligand specificity. The putative endo-mannanase module, GH5_7 (RfGH5_7), was cloned, expressed in Escherichia coli BL-21(DE3) cells and purified. SDS-PAGE analysis of purified RfGH5_7 showed molecular size ~ 35 kDa. Substrate specificity analysis of RfGH5_7 showed maximum activity against locust bean galactomannan (298.5 U/mg) followed by konjac glucomannan (256.2 U/mg) and carob galactomannan (177.2 U/mg). RfGH5_7 showed maximum activity at optimum pH 6.0 and temperature 60 °C. RfGH5_7 displayed stability in between pH 6.0 and 9.0 and thermostability till 50 °C. 10 mM Ca2+ ions increased the enzyme activity by 33%. The melting temperature of RfGH5_7 was 84 °C that was not affected by Ca2+ ions or chelating agents. RfGH5_7 showed, Vmax, 389 U/mg and Km, 0.92 mg/mL for locust bean galactomannan. TLC analysis revealed that RfGH5_7 hydrolysed locust bean galactomannan predominantly to mannose, mannobiose, mannotriose and higher degree of polymerization of manno-oligosaccharides indicating an endo-acting catalytic mechanism. This study revealed a highly active and thermostable endo-mannanase with considerable biotechnological potential.
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Abbreviations
- GH:
-
Glycoside hydrolases
- Rf:
-
Ruminococcus flavefaciens
- TLC:
-
Thin-layer chromatography
- IMAC:
-
Immobilized metal ion affinity chromatography
- ESI-MS:
-
Electron spray ionization mass spectrometry
- SDS-PAGE:
-
Sodium dodecyl sulphate-polyacrylamide gel electrophoresis
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Acknowledgements
This research work was supported by NERBPMC Twinning project from DBT (No. BT/PR24786/NER/95/853/2017), Ministry of Science and Technology, Govt. of India to AG. The authors are thankful to Central Instrumentation Facility, IIT Guwahati for providing ESI-MS facility. The authors are thankful to Vikky Rajulapati for his help in ESI-MS analysis.
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Goyal, D., Kumar, K., Centeno, M.S.J. et al. Molecular Cloning, Expression and Biochemical Characterization of a Family 5 Glycoside Hydrolase First Endo-Mannanase (RfGH5_7) from Ruminococcus flavefaciens FD-1 v3. Mol Biotechnol 61, 826–835 (2019). https://doi.org/10.1007/s12033-019-00205-2
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DOI: https://doi.org/10.1007/s12033-019-00205-2