| RRC ID |
48173
|
| 著者 |
McCarthy S, Johnson T, Pavlik BJ, Payne S, Schackwitz W, Martin J, Lipzen A, Keffeler E, Blum P.
|
| タイトル |
Expanding the Limits of Thermoacidophily in the Archaeon Sulfolobus solfataricus by Adaptive Evolution.
|
| ジャーナル |
Appl Environ Microbiol
|
| Abstract |
Extremely thermoacidophilic Crenarchaeota belonging to the order Sulfolobales flourish in hot acidic habitats that are strongly oxidizing. The pH extremes of these habitats, however, often exceed the acid tolerance of type species and strains. Here, adaptive laboratory evolution was used over a 3-year period to test whether such organisms harbor additional thermoacidophilic capacity. Three distinct cell lines derived from a single type species were subjected to high-temperature serial passage while culture acidity was gradually increased. A 178-fold increase in thermoacidophily was achieved after 29 increments of shifted culture pH resulting in growth at pH 0.8 and 80°C. These strains were named super-acid-resistant Crenarchaeota (SARC). Mathematical modeling using growth parameters predicted the limits of acid resistance, while genome resequencing and transcriptome resequencing were conducted for insight into mechanisms responsible for the evolved trait. Among the mutations that were detected, a set of eight nonsynonymous changes may explain the heritability of increased acid resistance despite an unexpected lack of transposition. Four multigene components of the SARC transcriptome implicated oxidative stress as a primary challenge accompanying growth at acid extremes. These components included accelerated membrane biogenesis, induction of the mer operon, and an increased capacity for the generation of energy and reductant.
|
| 巻・号 |
82(3)
|
| ページ |
857-67
|
| 公開日 |
2016-2-1
|
| DOI |
10.1128/AEM.03225-15
|
| PII |
AEM.03225-15
|
| PMID |
26590281
|
| PMC |
PMC4725277
|
| MeSH |
Adaptation, Physiological
Archaeal Proteins / genetics
Archaeal Proteins / metabolism
Biotechnology
Directed Molecular Evolution*
Genome, Bacterial
Hot Temperature*
Hydrogen-Ion Concentration
Models, Biological
Multigene Family
Mutation
Operon
Oxidation-Reduction
Oxidative Stress / genetics
Sequence Analysis, DNA
Sulfolobus solfataricus / genetics*
Sulfolobus solfataricus / growth & development
Sulfolobus solfataricus / physiology*
Time Factors
Transcriptome
|
| IF |
4.016
|
| 引用数 |
19
|
| リソース情報 |
| 一般微生物 |
JCM 30930 |
