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Introductory Chapter: A Brief Overview of Archaeal Applications

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Haïtham Sghaier, Afef Najjari and Kais Ghedira

Submitted: May 8th, 2017 Published: October 11th, 2017

DOI: 10.5772/intechopen.70289

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1. Prologue

The first member of the Archaea was described in 1880 [13]. Yet, the recognition and formal description of the domain Archaea, as separated from Bacteria and Eukarya, occurred in 1977 during early phylogenetic analyses based upon ribosomal DNA sequences [46]. Indeed, members of the archaeal domain are characterized by several distinguishing traits [3] as confirmed later based on the first complete archaeal genome sequence obtained by Bult et al.[7] and the subsequent finished and ongoing archaeal sequencing projects (, [8, 9].

The archaeal domain is composed of the DPANN superphylum[10]—Aenigmarchaeota, Diapherotrites, Nanoarchaeota, Nanohaloarchaeota, Pacearchaeota, Parvarchaeotaand Woesearchaeota[11]—excluded from the common branch of the TACK(or TACKL [12]) superphylum[13]—Aigarchaeota[14], Bathyarchaeota[15], Crenarchaeota[16], Korarchaeota[17], Lokiarchaeota[18] and Thaumarchaeota [19]—with the Euryarchaeota phylum[16]—extreme halophilic Archaea, hyperthermephiles such as Thermococcusand Pyrococcus, most acidophilic-thermophilic prokaryotes, the thermophilic-acidophilic cell wall-less Thermoplasma, methanogens [20] and the Altiarchaeales clade [21].

The Archaea are ubiquitous in most terrestrial, aquatic and extreme environments (acidophilic, halophilic, mesophilic, methanogenic, psychrophilic and thermophilic) [20, 22]. Although very diversified with a great number of species, luckily, no member of the domain Archaea has been described as a pathogen for humans, animals or plants [2325]. Thus, Archaea are a potentially valuable resource in the development of new biocatalysts, novel pharmaceuticals and various biotechnological applications. Applications of Archaea (for review, see [2632] and references therein) may be subdivided into four main fields (Figure 1): (i) commercial enzymes and/or molecules, (ii) environment, (iii) foodand (iv) health.

Figure 1.

Examples of potential applications of Archaea in biotechnology depicted in a 16S rDNA phylogenetic tree visualized via the iTOL (Interactive Tree Of Life) tool[33]. Potential applications of Archaea were subdivided into four fields (commercial enzymes and/or molecules (stars), environment (circles), food (triangles) and health (squares)) based on the reference(s) listed following each species. Thirty eight (n=38) archaeal species were integrated into the above phylogenetic tree (one DPANN species (white color), 21 Euryarchaeota species (dark grey color), 16 TACK species (light grey color)):Acidianus hospitalisW1 (NC_015518) [34,35],Acidilobus saccharovorans345-15 (NC_014374) [36,37],Aeropyrum caminiJCM 12091 (NC_121692) [38],Aeropyrum pernixK1 (NC_000854) [39],Archaeoglobus fulgidusDSM 4304 (NC_000917) [40,41],Caldivirga maquilingensisIC-167 (NC_009954) [42],Desulfurococcus fermentansDSM 16532 (NC_018001) [43],Desulfurococcus mobilisDSM 2161 (NC_014961) [44],Ferroglobus placidusDSM 10642 (NC_013849) [45],Fervidicoccus fontisKam940 (NC_017461) [46],Halobacterium salinarumR1 (NC_010364) [47],Halobacteriumsp. NRC-1 (NC_002607) [48],Haloferax mediterraneiATCC 33500 (NC_017941) [49],Halogeometricum borinquenseDSM 11551 (NC_014729) [50],Halorhabdus utahensisJCM 11049 (NC_013158) [51],Halostagnicola larseniiXH-48 (NZ_CP007055) [52],Haloterrigena turkmenicaDSM 5511 (NC_013743) [53],Metallosphaera cuprinaAr-4 (NC_015435) [54],Metallosphaera sedulaDSM 5348 (NC_009440) [55],Methanocaldococcus jannaschiiDSM 2661 (NC_000909) [27,56],Methanotorris igneusDSM 5666 (NC_015562) [57],Natrialba magadiiATCC 43099 (NC_013922) [58],Nanoarchaeum equitansKin4-M (NC_005213) [59,60],Pyrobaculum aerophilumIM2 (NC_041958) [61,62],Pyrobaculum calidifontisJCM 11548 (NC_009073) [63],Pyrobaculumsp. 1860 (NC_016645) [64,65],Pyrococcus horikoshiiOT3 (NC_000961) [66],Pyrococcussp. ST04 (NC_017946) [67],Pyrococcus yayanosiiCH1 (NC_015680) [68],Sulfolobus acidocaldariusDSM 639 (NC_007181) [69],Sulfolobus solfataricusP2 (NZ_LT549890) [70],Thermococcus gammatoleransEJ3 (NC_012804) [71],Thermococcus litoralisDSM 5473 (NC_022084) [72],Thermococcus onnurineusNA1 (NC_011529) [73],Thermococcussp. CL1 (NC_018015) [74],Thermoplasma acidophilumDSM 1728 (NC_002578) [75,76],Thermoplasma volcaniumGSS1 (NC_002689) [77],Vulcanisaeta moutnovskia768-28 (NC_015151) [78].

The book ‘Archaea - New Biocatalysts, Novel Pharmaceuticals and Various Biotechnological Applications’ contains five chapters.

The first chapteris an Introductory Chapter, where editors give a general overview of the content of the book.

The second chapterby Castro-Fernandez et al.,entitled ‘Evolution, metabolism and molecular mechanisms underlying extreme adaptation of Euryarchaeotaand its biotechnological potential’, provides an interesting depiction of the phylum Euryarchaeotain terms of evolutive history, metabolic strategies, lipid composition, proteic structural adaptations and its biotechnological applications.

The third chapter‘Archaebiotics: archaea as pharmabiotics for treating chronic disease in humans?’ was written by Ben Hania and co-authors. It promotes the idea that some specific archaea are potential next-generation probiotics.

The fourth chapter‘Biocompounds from haloarchaea and their uses in biotechnology’ by Torregrosa-Crespo et al.,emphasizes the main characteristics of biocompounds from haloarchaea and their potential uses in biomedicine, pharmacy and industry.

The book concludes with a (fifth) chapterby Mizuno et al.,entitled ‘Plasmid curing is a promising approach to improve thermophiles for biotechnological applications: perspectives in archaea’, providing a new tip based on the plasmid-curing approach for improving the potential of thermophiles in various biotechnological applications.

Finally, we would like to thank all authors for their contributions. We are also grateful to InTech Publishing Process Managers, particularly Ms. Mirena Čalmić, Ms. Romina Rovan and Ms. Ana Pantar, who assisted us with patience until the publication of this book.


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Written By

Haïtham Sghaier, Afef Najjari and Kais Ghedira

Submitted: May 8th, 2017 Published: October 11th, 2017