Extracellular α-glucosidase of an alkalophilic microorganism, Bacillus sp. ATCC 21591

Kelly, C

doi:10.1016/0378-1097(83)90168-4

Cited by 4 publications

(4 citation statements)

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“…The enzyme is most active at 55˚C, and is stable up to 50˚C for 15 min in the absence of substrate. Kelly et al 46) reported that alkaliphilic Bacillus halodurans No. A-59 produced three enzymes, α-amylase, pullulanase and α-glucosidase in culture broth.…”

Section: )mentioning

confidence: 99%

Alkaliphiles

Horikoshi

2004

Proc. Jpn. Acad., Ser. B

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Abstract:The term alkaliphile is used for microorganisms that grow optimally or very well at pH values above 9, but cannot grow or grow only slowly at the near neutral pH value of 6.5. Alkaliphiles include prokaryotes, eukaryotes, and archaea. Alkaliphiles can be isolated from normal environments such as garden soil, although viable counts of alkaliphiles are higher in samples from alkaline environments. The cell surface plays a key role in keeping the intracellular pH value in the range between 7 and 8.5, allowing alkaliphiles to thrive in alkaline environments. Alkaliphiles have made a great impact in industrial applications. Biological detergents contain alkaline enzymes, such as alkaline cellulases and/or alkaline proteases that have been produced from alkaliphiles. Another important application is the industrial production of cyclodextrin with alkaline cyclomaltodextrin glucanotransferase. This enzyme reduced the production cost and paved the way for cyclodextrin use in large quantities in foodstuffs, chemicals and pharmaceuticals. It has also been reported that alkali-treated wood pulp could be biologically bleached by xylanases produced by alkaliphiles.

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Section: )mentioning

confidence: 99%

Alkaliphiles

Horikoshi

2004

Proc. Jpn. Acad., Ser. B

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“…The enzyme is most active at 55°C and is stable up to 50°C for 15 min in the absence of substrate. Kelly et al found that alkaliphilic B. halodurans A-59 (ATCC 21591) produced three enzymes, ␣-amylase, pullulanase, and ␣-glucosidase, in culture broth (87). These three enzymes were separately produced, and the levels of ␣-glucosidase and pullulanase reached their maxima after 24 h of cultivation at the initial pH 9.7.…”

Section: Starch-degrading Enzymesmentioning

confidence: 99%

Alkaliphiles: Some Applications of Their Products for Biotechnology

Horikoshi

1999

Microbiol Mol Biol Rev

672

236

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SUMMARY The term “alkaliphile” is used for microorganisms that grow optimally or very well at pH values above 9 but cannot grow or grow only slowly at the near-neutral pH value of 6.5. Alkaliphiles include prokaryotes, eukaryotes, and archaea. Many different taxa are represented among the alkaliphiles, and some of these have been proposed as new taxa. Alkaliphiles can be isolated from normal environments such as garden soil, although viable counts of alkaliphiles are higher in samples from alkaline environments. The cell surface may play a key role in keeping the intracellular pH value in the range between 7 and 8.5, allowing alkaliphiles to thrive in alkaline environments, although adaptation mechanisms have not yet been clarified. Alkaliphiles have made a great impact in industrial applications. Biological detergents contain alkaline enzymes, such as alkaline cellulases and/or alkaline proteases, that have been produced from alkaliphiles. The current proportion of total world enzyme production destined for the laundry detergent market exceeds 60%. Another important application is the industrial production of cyclodextrin by alkaline cyclomaltodextrin glucanotransferase. This enzyme has reduced the production cost and paved the way for cyclodextrin use in large quantities in foodstuffs, chemicals, and pharmaceuticals. It has also been reported that alkali-treated wood pulp could be biologically bleached by xylanases produced by alkaliphiles. Other applications of various aspects of alkaliphiles are also discussed.

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“…Bacterial conversion of ginsenosides has been well documented [24][25][26][27], and Bacillus sp. are known to produce a plethora of degradative enzymes [28][29][30].…”

Section: Introductionmentioning

confidence: 99%