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Microbiology and Molecular Biology Reviews, March 2001, p. 1-43, Vol. 65, No. 1
1092-2172/01/$04.00+0   DOI: 10.1128/MMBR.65.1.1-43.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Hyperthermophilic Enzymes: Sources, Uses, and Molecular Mechanisms for Thermostability

Claire Vieille and Gregory J. Zeikus1,2,*

Biochemistry Department, Michigan State University, East Lansing, Michigan 48824,1 and MBI International, Lansing Michigan 489092

Enzymes synthesized by hyperthermophiles (bacteria and archaea with optimal growth temperatures of >80°C), also called hyperthermophilic enzymes, are typically thermostable (i.e., resistant to irreversible inactivation at high temperatures) and are optimally active at high temperatures. These enzymes share the same catalytic mechanisms with their mesophilic counterparts. When cloned and expressed in mesophilic hosts, hyperthermophilic enzymes usually retain their thermal properties, indicating that these properties are genetically encoded. Sequence alignments, amino acid content comparisons, crystal structure comparisons, and mutagenesis experiments indicate that hyperthermophilic enzymes are, indeed, very similar to their mesophilic homologues. No single mechanism is responsible for the remarkable stability of hyperthermophilic enzymes. Increased thermostability must be found, instead, in a small number of highly specific alterations that often do not obey any obvious traffic rules. After briefly discussing the diversity of hyperthermophilic organisms, this review concentrates on the remarkable thermostability of their enzymes. The biochemical and molecular properties of hyperthermophilic enzymes are described. Mechanisms responsible for protein inactivation are reviewed. The molecular mechanisms involved in protein thermostabilization are discussed, including ion pairs, hydrogen bonds, hydrophobic interactions, disulfide bridges, packing, decrease of the entropy of unfolding, and intersubunit interactions. Finally, current uses and potential applications of thermophilic and hyperthermophilic enzymes as research reagents and as catalysts for industrial processes are described.

* Corresponding author. Mailing address: Michigan Biotechnology Institute, 3900 Collins Rd., Lansing, MI 48909. Phone: (517) 337-3181. Fax: (517) 337-2122. E-mail: zeikus{at}mbi.org.

Microbiology and Molecular Biology Reviews, March 2001, p. 1-43, Vol. 65, No. 1
1092-2172/01/$04.00+0   DOI: 10.1128/MMBR.65.1.1-43.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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