By Cavicchioli, Ricardo
This path-breaking booklet totally describes the molecular cellphone biology of the archaea in a single available and readable quantity. With twenty-three chapters via the world's prime specialists, this publication emphasizes every one author's person examine services, whereas additionally being a basic consultant to the newest wisdom on archaea.
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Extra info for Archaea : molecular and cellular biology
Modiﬁcations (bold type) of the amino acids histidine and lysine to form diphthamide and hypusine, respectively. ADP ribosylation site catalyzed by diphtheria toxin (arrow). 29 (294). The synthase but not the hydroxylase gene has been identified in the Eucarya and Archaea (43). Crystal structures of IF-5D have been obtained from three hyperthermophilic archaea, but equivalent structures are not available from Eucarya (196, 298, 439). The structures reveal that the hypusine is positioned at the tip of an extended and exposed loop of conserved amino acid residues, which appears to mimic the anticodon loop of a tRNA molecule.
Volcanii WFD11 wild type. Photographs courtesy of T. Hechler, Darmstadt. 36 CHAPTER 2 • GENERAL CHARACTERISTICS AND IMPORTANT MODEL ORGANISMS as Halobacterium, are rods, and others, such as Natronococcus, are cocci. Many are flagellated and motile. , Haloferax) are ﬂattened cells that look like pleomorphic discs when viewed from the top and thin rods when viewed from the edge (Fig. 12). This morphology is otherwise uncommon in the Archaea, with the exception of Pyrodictium spp. (see “Pyrodictiaceae,” below).
Pyrodictium), which is similar to the range of GϩC content in mesophiles. The only and notable exceptions are rRNA genes (274, 348). Insight into mechanisms of DNA replication in Archaea has progressed very rapidly in the past few years (see Chapter 3). Most archaeal replication proteins are more similar to those found in Eucarya than to the analogous proteins in Bacteria (187). For example, Archaea use ATP-dependent DNA ligases, similar to Eucarya, as opposed to NAD-dependent and phylogenetically unrelated bacterial enzymes (206).