Cloning of a novel phytase from an anaerobic rumen bacterium, Mitsuokella jalaludinii, and its expression in Escherichia coli

doi:10.1016/S2095-3119(14)60960-6

Journal of Integrative Agriculture ›› 2015, Vol. 14 ›› Issue (9): 1816-1826.DOI: 10.1016/S2095-3119(14)60960-6

Cloning of a novel phytase from an anaerobic rumen bacterium, Mitsuokella jalaludinii, and its expression in Escherichia coli

TAN Wan-qin, Phang Chiun Yee, Sieo Chin Chin, Yiap Beow Chin, Clemente Michael Wong Vui Ling, Norhani Abdullah, Son Radu, Ho Yin Wan

1、Laboratory of Vaccines and Immunotherapeutics, Institute of Bioscience, Universiti Putra Malaysia, Serdang 43400, Malaysia
2、Department of Microbiology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang 43400,Malaysia
3、Department of Life Sciences, School of Pharmacy and Health, Faculty of Medicine and Health, International Medical University,Kuala Lumpur 57000, Malaysia
4、Biotechnology Research Institute, Universiti Malaysia Sabah, Kota Kinabalu 88400, Malaysia
5、Institute of Tropical Agriculture, Universiti Putra Malaysia, Serdang 43400, Malaysia
6、Department of Biochemistry, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang 43400,Malaysia
7、Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia, Serdang 43400, Malaysia

收稿日期:2014-08-26 出版日期:2015-09-03 发布日期:2015-09-05
通讯作者: Sieo Chin Chin, Tel: +60-3-89466702,E-mail: sieo@upm.edu.my
作者简介:TAN Wan-qin, E-mail: wqtan_27@hotmail.com;
基金资助:
The financial support provided by the Universiti Putra Malaysia under the Research University Grant Scheme and Ministry of Higher Education under the Long Term Research Grant Scheme, Malaysia, is gratefully acknowledged.

Cloning of a novel phytase from an anaerobic rumen bacterium, Mitsuokella jalaludinii, and its expression in Escherichia coli

TAN Wan-qin, Phang Chiun Yee, Sieo Chin Chin, Yiap Beow Chin, Clemente Michael Wong Vui Ling, Norhani Abdullah, Son Radu, Ho Yin Wan

1、Laboratory of Vaccines and Immunotherapeutics, Institute of Bioscience, Universiti Putra Malaysia, Serdang 43400, Malaysia
2、Department of Microbiology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang 43400,Malaysia
3、Department of Life Sciences, School of Pharmacy and Health, Faculty of Medicine and Health, International Medical University,Kuala Lumpur 57000, Malaysia
4、Biotechnology Research Institute, Universiti Malaysia Sabah, Kota Kinabalu 88400, Malaysia
5、Institute of Tropical Agriculture, Universiti Putra Malaysia, Serdang 43400, Malaysia
6、Department of Biochemistry, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang 43400,Malaysia
7、Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia, Serdang 43400, Malaysia

Received:2014-08-26 Online:2015-09-03 Published:2015-09-05
Contact: Sieo Chin Chin, Tel: +60-3-89466702,E-mail: sieo@upm.edu.my
About author:TAN Wan-qin, E-mail: wqtan_27@hotmail.com;
Supported by:
The financial support provided by the Universiti Putra Malaysia under the Research University Grant Scheme and Ministry of Higher Education under the Long Term Research Grant Scheme, Malaysia, is gratefully acknowledged.

摘要/Abstract

摘要： The full length phytase gene of Mitsuokella jalaludinii was successfully cloned and was found to be 1 047 bp in length, with 348 amino acids, and was designated as PHY7 phytase gene. A comparison of the sequence of PHY7 phytase gene of M. jalaludinii with various microbial phytase gene sequences showed that it was not similar to those from other bacteria except Selenomonas ruminatium, thus suggesting that they may both express a new class of phytase. The PHY7 phytase gene was subsequently subcloned into bacterial expression vector, pET32a, for expression in Escherichia coli strain Rosetta- gami. Expression of the recombinant phytase gene was optimised and characterised. The recombinant phytase was estimated to be approximately 55 kDa by SDS-PAGE analysis. The recombinant phytase exhibited optimum activity at 55°C, pH 4.5 and showed good pH stability from pH 3.5 to 5.5 (>78% relative activity). Metal ions such as Ca2+, Mg2+, and K+ were found to exert significant stimulatory effect on the recombinant phytase activity while Cu2+, Fe3+, and Zn2+ greatly inhibited the enzyme activity. The recombinant phytase showed moderate resistance to trypsin proteolysis, but susceptible to pepsin proteolysis. The results of the study showed that several characteristics of recombinant phytase were slightly different from the native enzyme. Unfavourable characteristics such as reduced pH stability and metal ion effects should be taken into consideration during feed enzyme formulation.

关键词: phytase , cloning , recombinant , Escherichia coli , Mitsuokella jalaludinii

Abstract: The full length phytase gene of Mitsuokella jalaludinii was successfully cloned and was found to be 1 047 bp in length, with 348 amino acids, and was designated as PHY7 phytase gene. A comparison of the sequence of PHY7 phytase gene of M. jalaludinii with various microbial phytase gene sequences showed that it was not similar to those from other bacteria except Selenomonas ruminatium, thus suggesting that they may both express a new class of phytase. The PHY7 phytase gene was subsequently subcloned into bacterial expression vector, pET32a, for expression in Escherichia coli strain Rosetta- gami. Expression of the recombinant phytase gene was optimised and characterised. The recombinant phytase was estimated to be approximately 55 kDa by SDS-PAGE analysis. The recombinant phytase exhibited optimum activity at 55°C, pH 4.5 and showed good pH stability from pH 3.5 to 5.5 (>78% relative activity). Metal ions such as Ca2+, Mg2+, and K+ were found to exert significant stimulatory effect on the recombinant phytase activity while Cu2+, Fe3+, and Zn2+ greatly inhibited the enzyme activity. The recombinant phytase showed moderate resistance to trypsin proteolysis, but susceptible to pepsin proteolysis. The results of the study showed that several characteristics of recombinant phytase were slightly different from the native enzyme. Unfavourable characteristics such as reduced pH stability and metal ion effects should be taken into consideration during feed enzyme formulation.

Key words: phytase , cloning , recombinant , Escherichia coli , Mitsuokella jalaludinii

TAN Wan-qin, Phang Chiun Yee, Sieo Chin Chin, Yiap Beow Chin, Clemente Michael Wong Vui Ling, Norhani Abdullah, Son Radu, Ho Yin Wan. Cloning of a novel phytase from an anaerobic rumen bacterium, Mitsuokella jalaludinii, and its expression in Escherichia coli[J]. Journal of Integrative Agriculture, 2015, 14(9): 1816-1826.

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Cloning of a novel phytase from an anaerobic rumen bacterium, Mitsuokella jalaludinii, and its expression in Escherichia coli

Cloning of a novel phytase from an anaerobic rumen bacterium, Mitsuokella jalaludinii, and its expression in Escherichia coli

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