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Molecular Cloning of Alpha-Amylase Gene From Bacillus Amyloliquefaciens and Its Expression in B. Subtilis

Molecular Cloning of Alpha-Amylase Gene From Bacillus Amyloliquefaciens and Its Expression in B. Subtilis

I Palva

Gene. Jul-Aug 1982;19(1):81-7.

PMID: 6183169

Abstract:

The gene coding for alpha-amylase from Bacillus amyloliquefaciens was isolated by direct shotgun cloning using B. subtilis as a host. The genome of B. amyloliquefaciens was partially digested with the restriction endonuclease MboI and 2- to 5-kb fragments were isolated and joined to plasmid pUB110. Competent B. subtilis amylase-negative cells were transformed with the hybrid plasmids and kanamycin-resistant transformants were screened for the production of alpha-amylase. One of the transformants producing high amounts of alpha-amylase was characterized further. The alpha-amylase gene was shown to be present in a 2.3-kb insert. The alpha-amylase production of the transformed B. subtilis could be prevented by inserting lambda DNA fragments into unique sites of EcoRI, HindIII and KpnI in the insert. Foreign DNA inserted into a unique ClaI site failed to affect the alpha-amylase production. The amount of alpha-amylase activity produced by this transformed B. subtilis was about 2500-fold higher than that for the wild-type B. subtilis Marburg strain, and about 5 times higher than the activity produced by the donor B. amyloliquefaciens strain. Virtually all of the alpha-amylase was secreted into the culture medium. The secreted alpha-amylase was shown to be indistinguishable from that of B. amyloliquefaciens as based on immunological and biochemical criteria.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP9000855-B	α-Amylase from Bacillus amyloliquefaciens		9000-85-5	Price

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