Download e-book for iPad: Antibiotics: Actions, Origins, Resistance by Christopher Walsh

By Christopher Walsh

ISBN-10: 1555818935

ISBN-13: 9781555818937

A finished account of the structural periods of antibiotics that experience impacted human infectious affliction. • offers an advent to antibiotics and examines how antibiotics block particular proteins performing in crucial bacterial procedures and the way the molecular constitution of the small-molecule medicines allows their antibiotic task. • Explores the advance of bacterial resistance to antibiotics, together with the molecular common sense that microbial manufacturers of antibiotics use for self-protection. • Addresses the molecular common sense of antibiotic biosynthesis, beginning with regulatory networks that keep watch over gene transcription of secondary metabolites in streptomycetes, and examines the customers for broadening the bottom of bacterial pursuits and in addition the place new antibiotics tend to emerge, together with either artificial chemical efforts and typical items.

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Extra info for Antibiotics: Actions, Origins, Resistance

Example text

2C) and of the gram-negative Leucothrix mucor (Fig. 3D). The scanning micrographs of the gram-positive Bacillus subtilis (Fig. 2E) and of the gramnegative E. coli (Fig. 2F) show different surface textures. Three phases of peptidoglycan enzymatic assembly: cytoplasmic, membrane-associated, and extracytoplasmic Enzymes in the cytoplasmic phase of the Mur pathway: MurA-F As bacteria grow and divide, PG layer(s) have to be laid down both transversely and laterally (for septum formation) (Holtje, 1998).

The 3Ј substituents differ more widely, some with positively charged amines, which also affect intrinsic antibacterial activity and pharmacokinetics and distribution. For example, many of them penetrate well into the cerebrospinal fluid when meninges are inflamed (Scholar and Pratt, 2000) and are effective for treating meningitis. Overall, the semisynthetic manipulation of cephalosporin side chains shows the ability for optimization against different subsets of pathogens, accounting for the dominant role in many infections where ␤-lactam antibiotics are prescribed.

Antibiotics That Act on Cell Wall Biosynthesis 47 Teicoplanin differs in three ways from vancomycin: (i) the glycosylation number and placement is distinct; (ii) teicoplanin has a long-chain fatty acid substituent in amide linkage to the GlcNAc sugar attached to PheGly4; and (iii) the cross-linked heptapeptide scaffold is different at residues 1 and 3, allowing four side chain cross-links (1-3, 2-4, 4-6, 5-7) in contrast to the three in vancomycin (see Hubbard and Walsh, 2002; Williams and Bardsley, 1999; and references therein).

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Antibiotics: Actions, Origins, Resistance by Christopher Walsh


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