Download Alkaliphiles: Genetic Properties and Applications of Enzymes by Koki Horikoshi PDF

By Koki Horikoshi

The pioneering paintings of Dr. Koki Horikoshi at the discovery, examine and functions of alkaliphilic micro organism are defined right here of their entirety. The isolation, distribution and taxonomy of alkaliphilic microorganisms in addition to their telephone constitution and body structure are mentioned for a easy realizing of those entities. The molecular biology and genome sequencing of a few alkaliphilic bacterial traces also are presented.

Part II of the quantity specializes in enzymes of alkaliphiles and their functions. those contain alkaline proteases, starch-degrading enzymes and diverse others. a few of these enzymes are at the moment in huge advertisement use as laundry detergent ingredients and in wastewater treatment.

Alkaliphiles are a comparatively contemporary box of analysis that would without doubt offer avenues to a variety of additional discoveries and functions for a brand new iteration of staff in bioscience and technology.

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Additional info for Alkaliphiles: Genetic Properties and Applications of Enzymes

Sample text

4 HO-CH f HO-CH I HoC-O O Ribitol type OH Teichoic acid. tion 2 is D-glutamic acid, which is Hnked by its y-carboxyl group to meso-diaminopimelic acid in position 3, and position 4 is occupied by D-alanine. It is noted that amino acids with the D-configuration are present in the peptidoglycan, and these D- and L-amino acids occur in an akernating arrangement. Teichoic acid is a polymer consisting of phosphoric acid and ribitol or glycerol to which D-glucose and D-alanine are attached (Fig. 4). The phosp h o r i c acid a n d ribitol or glycerol are b o u n d by ester linkage.

The cell wall of gram-positive bacteria is usually thicker than that of gram-negative bacteria. 2 Cell Wall 29 CH2OH NHCOCH3 NHCOCH3 HCCH3 CO I NH CH3CH CO I NH H C C O - NH2 CH2 CII2 CO Cross-linkage •*— NH2 . I NH HCCH2CH2CH2CH I CO COOH [^^ HCCH3 COOH Cross -linkage Fig. 3 Peptidoglycan of Bacillus species. and 50 nm in thickness and are relatively featureless in thin section by electron microscopy. Growth conditions, age of culture and sporulation cause variations in thickness. ) is composed of three main components: (1) peptidoglycan; (2) polysaccharides, teichoic acid or teichuronic acid; and (3) proteins.

Based on the anchoring point of the cross-linkage between the two peptide chains, the peptidoglycans have been classified into two main groups, A and B, each of which is further divided into several subgroups depending on the variation in the kind of interpeptide bridges and of the amino acids in position 3 of the peptide chain. The general structure of peptidoglycan of the genus Bacillus is shown in Fig. 3. A cross-linkage is formed between the eamino group of diaminopimelic acid in position 3 of a peptide chain and the carboxyl group of D-alanine in position 4 of another adjacent peptide chain.

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