Production and purification of mannan oligosaccharide with epithelial tight junction enhancing activity

Chatchai Nopvichai; Thanapon Charoenwongpaiboon; Navaporn Luengluepunya; Kazuo Ito; Chatchai Muanprasat; Rath Pichyangkura

doi:10.7717/peerj.7206

Production and purification of mannan oligosaccharide with epithelial tight junction enhancing activity

PeerJ. 2019 Jul 2:7:e7206. doi: 10.7717/peerj.7206. eCollection 2019.

Authors

Chatchai Nopvichai¹, Thanapon Charoenwongpaiboon¹, Navaporn Luengluepunya¹, Kazuo Ito², Chatchai Muanprasat³, Rath Pichyangkura¹

Affiliations

¹ Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand.
² Graduate School of Science, Osaka City University, Osaka, Japan.
³ Department of Physiology, Faculty of Science, Mahidol University, Bangkok, Thailand.

Abstract

Background: Mannanan oligosaccharide (MOS) is well-known as effective supplement food for livestock to increase their nutrients absorption and health status, but the structure and identification of bioactive MOS remain unclear. In this study, MOS production was accomplished, using enzymatic hydrolysis of pretreated coconut meal substrate with recombinant mannanase.

Methods: The mannanase gene was cloned from Bacillus subtilis cAE24, then expressed in BL21. Purified Mannanase exhibit stability over a wide range of pH and temperature from pH 6-8 and 4 °C to 70 °C, respectively. SEM analysis revealed that sonication could change the surface characteristic of copra meal, which gave better MOS yield, compared to untreated substrates. The separation and purification of each MOS were achieved using Biogel-P2 column chromatography. Determination of biological active MOS species was also investigated. T84 cells were cultured and treated with each of the purified MOS species to determine their tight junction enhancing activity.

Results: Scanning electron microscope imaging showed that pretreatment using sonication could disrupt the surface of copra meal better than grinding alone, which can improve the production of MOS. Pentamer of MOS (M5) significantly increased tight junction integration of T84 cells measured with TEER (p < 0.0001).

Keywords: Mannan oligosaccharide; Mannanase; Tight junction integration.

Grants and funding

This work was supported by the 100th Anniversary Chulalongkorn University Fund for Doctoral scholarship, the office of Graduate School, Chulalongkorn University. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.