Cloning, expression and purification of cold adapted acetate kinase from Shewanella species AS-11
A psychrotrophic bacterium, Shewanella sp. AS-11 was isolated from a buccinid (shell) Neobuccinum living in the Antarctic ice-covered sea. An open reading frame of 1203 bp, coding for acetate kinase gene, called ack, was amplified, cloned into the expression vector, pETY-16b, and the enzyme was over...
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ftjafricanj:oai:ojs.ajol.info:article/102392 2023-05-15T13:36:29+02:00 Cloning, expression and purification of cold adapted acetate kinase from Shewanella species AS-11 Tang, Md. Abul Kashem Motoshima, Hiroyuki Watanabe, Keiichi 2014-04-07 application/pdf http://www.ajol.info/index.php/ajb/article/view/102392 eng eng Academic Journals (Kenya) http://www.ajol.info/index.php/ajb/article/view/102392/92622 http://www.ajol.info/index.php/ajb/article/view/102392 10.4314/ajb.v11i29. Copyright for articles published in this journal is retained by the journal. African Journal of Biotechnology; Vol 11, No 29 (2012) 1684-5315 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 2014 ftjafricanj 2014-04-13T00:23:20Z A psychrotrophic bacterium, Shewanella sp. AS-11 was isolated from a buccinid (shell) Neobuccinum living in the Antarctic ice-covered sea. An open reading frame of 1203 bp, coding for acetate kinase gene, called ack, was amplified, cloned into the expression vector, pETY-16b, and the enzyme was overproduced by using T7 system in Escherichia coli BL21 (DE3). After extraction of crude recombinant acetate kinase, the desired enzyme was able to be purified on a Blue Sepharose CL-6B and Super-Q affinity column chromatography. The molecular mass of the enzyme is about 86 kDa, which is associated with two monomers. In respect of pH, the enzyme was stable between 6 to 8 and maximum activity was obtained at 7.5. The purified enzyme was stable at 30°C but ligand bound enzyme was stable at 40°C. The structural comparison to mesophilic and thermophilic acetate kinases demonstrates that the psychrophilic one contains lower number of salt bridges and cation-pi interaction. So, it can be suggested that the enzyme is cold adapted with thermolabile and flexible structure.Keywords: Acetate kinase, thermolabile, cold adapted, flexible, activityAfrican Journal of Biotechnology Vol. 11(29), pp. 7454-7463, 10 April, 2012 Article in Journal/Newspaper Antarc* Antarctic AJOL - African Journals Online Antarctic The Antarctic |
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AJOL - African Journals Online |
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ftjafricanj |
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English |
description |
A psychrotrophic bacterium, Shewanella sp. AS-11 was isolated from a buccinid (shell) Neobuccinum living in the Antarctic ice-covered sea. An open reading frame of 1203 bp, coding for acetate kinase gene, called ack, was amplified, cloned into the expression vector, pETY-16b, and the enzyme was overproduced by using T7 system in Escherichia coli BL21 (DE3). After extraction of crude recombinant acetate kinase, the desired enzyme was able to be purified on a Blue Sepharose CL-6B and Super-Q affinity column chromatography. The molecular mass of the enzyme is about 86 kDa, which is associated with two monomers. In respect of pH, the enzyme was stable between 6 to 8 and maximum activity was obtained at 7.5. The purified enzyme was stable at 30°C but ligand bound enzyme was stable at 40°C. The structural comparison to mesophilic and thermophilic acetate kinases demonstrates that the psychrophilic one contains lower number of salt bridges and cation-pi interaction. So, it can be suggested that the enzyme is cold adapted with thermolabile and flexible structure.Keywords: Acetate kinase, thermolabile, cold adapted, flexible, activityAfrican Journal of Biotechnology Vol. 11(29), pp. 7454-7463, 10 April, 2012 |
format |
Article in Journal/Newspaper |
author |
Tang, Md. Abul Kashem Motoshima, Hiroyuki Watanabe, Keiichi |
spellingShingle |
Tang, Md. Abul Kashem Motoshima, Hiroyuki Watanabe, Keiichi Cloning, expression and purification of cold adapted acetate kinase from Shewanella species AS-11 |
author_facet |
Tang, Md. Abul Kashem Motoshima, Hiroyuki Watanabe, Keiichi |
author_sort |
Tang, Md. Abul Kashem |
title |
Cloning, expression and purification of cold adapted acetate kinase from Shewanella species AS-11 |
title_short |
Cloning, expression and purification of cold adapted acetate kinase from Shewanella species AS-11 |
title_full |
Cloning, expression and purification of cold adapted acetate kinase from Shewanella species AS-11 |
title_fullStr |
Cloning, expression and purification of cold adapted acetate kinase from Shewanella species AS-11 |
title_full_unstemmed |
Cloning, expression and purification of cold adapted acetate kinase from Shewanella species AS-11 |
title_sort |
cloning, expression and purification of cold adapted acetate kinase from shewanella species as-11 |
publisher |
Academic Journals (Kenya) |
publishDate |
2014 |
url |
http://www.ajol.info/index.php/ajb/article/view/102392 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
African Journal of Biotechnology; Vol 11, No 29 (2012) 1684-5315 |
op_relation |
http://www.ajol.info/index.php/ajb/article/view/102392/92622 http://www.ajol.info/index.php/ajb/article/view/102392 10.4314/ajb.v11i29. |
op_rights |
Copyright for articles published in this journal is retained by the journal. |
_version_ |
1766079142069010432 |