By Cavicchioli, Ricardo
This path-breaking booklet totally describes the molecular mobile biology of the archaea in a single available and readable quantity. With twenty-three chapters by means of the world's top specialists, this e-book emphasizes each 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
A number of unique molecular properties that characterize Archaea were recognized in seminal studies from several laboratories in the 1970s and 1980s (see Chapter 1). These properties helped to substantiate that Archaea are fundamentally different from Bacteria despite their similar cellular organization (reviewed in reference 436); they include: • the presence of phytanyl ether instead of fatty ester lipids in the membranes. • the absence of canonical peptidoglycan and a frequent use of proteinaceous S layers.
All of these modiﬁcations require speciﬁc biosynthetic pathways. It seems improbable that these modiﬁcations were present at early stages of cellular evolution, or in LUCA, and were subsequently lost during adaptation to lowertemperature environments. It may be expected that these mechanisms of modification developed over evolutionary time in response to adaptation to hyperthermophily. • The half-life of some important biomolecules, including NAD(P)(H) and ATP, decreases dramatically with increasing temperature and decreasing pH, thereby decreasing the likelihood that life could have first evolved under these conditions (63).
The half-life of some important biomolecules, including NAD(P)(H) and ATP, decreases dramatically with increasing temperature and decreasing pH, thereby decreasing the likelihood that life could have first evolved under these conditions (63). • High temperatures may cause reactions to proceed in a less controlled fashion than lower temperatures, thereby making it more difﬁcult for microorganisms to evolve at hot rather than cold temperatures. A recent, alternative hypothesis is that life evolved in stratified seafloor hydrothermal mounds, where microcompartments the size of bacterial or archaeal cells were formed from FeS precipitates (256), and which may have served as scaffolds for cell formation prior to the presence of lipid vesicles.