Download e-book for kindle: Alkaliphiles: Genetic Properties and Applications of Enzymes by Koki Horikoshi

By Koki Horikoshi

The pioneering paintings of Dr. Koki Horikoshi at the discovery, learn and purposes of alkaliphilic micro organism are defined the following of their entirety. The isolation, distribution and taxonomy of alkaliphilic microorganisms in addition to their cellphone constitution and body structure are mentioned for a easy knowing of those entities. The molecular biology and genome sequencing of a few alkaliphilic bacterial lines also are presented.

Part II of the amount makes a speciality of enzymes of alkaliphiles and their purposes. those comprise alkaline proteases, starch-degrading enzymes and various others. a few of these enzymes are presently in large advertisement use as laundry detergent ingredients and in wastewater treatment.

Alkaliphiles are a comparatively contemporary box of analysis that may doubtless supply avenues to quite a lot of extra discoveries and functions for a brand new new release of employees in bioscience and technology.

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Extra info for Alkaliphiles: Genetic Properties and Applications of Enzymes

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Control experiments in which 20 \xM gramicidin was included in the incubation mixture were conducted for each assay. Assuming that ApH = 0 in the presence of gramicidin, internal pH was calculated from the difference in the presence and absence of gramicidin. (Reproduced with permission from T. Kudo et a l . 6 kb of common sequence between pALKl and pALK2 (Fig. 8). Plasmid pALKl conferred alkaliphily on mutant 18224 but not on mutant 31154. 5) but not after the introduction of pALKl. These results indicate that there are at least two factors involved in alkaliphily located in a closed linked region of chromosomal DNA, although the precise functions of these two DNA fragments are not known yet.

A Hind III fragment cloned in pALK2, which restores the alkaliphily of the mutant 38154, is indicated by a thick line. \rg in the ORFl product and from ^^Gly to Glu in the ORF3 product are responsible for the alkali sensitivity of mutants 38154 and 18224, respectively. (Reproduced with permission from T. , Mol. , 14, 939(1994) and Y. , Biosci. Biotechnol. Biochem.. 59, 1364(1995)) fragment responsible for an Na ^ / H ^ antiporter system in the alkaliphily of alkaliphilic microorganisms. C. O t h e r DNA fragments conferring alkaliphily in B.

Another alkali-sensitive mutant, strain 18224, was found to have a mutation resulting in an amino acid substitution in the 82nd residue in the ORF3 product (Seto et al. 1995). Mutant 18224 still retains the ability to c o n t r o l the i n t e r n a l p H , a l t h o u g h it shows alkali-sensitive growth (Hashimoto et al. 1994). It appears that ORF3 is not involved in N a ^ / H ^ antiport itself but it may be involved in a regulatory process or some other function associated with ion transport.

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