keyword
MENU ▼
Read by QxMD icon Read
search

Sulfolobus

keyword
https://www.readbyqxmd.com/read/29331688/coproheme-decarboxylases-phylogenetic-prediction-versus-biochemical-experiments
#1
Vera Pfanzagl, Laurenz Holcik, Daniel Maresch, Giulia Gorgone, Hanna Michlits, Paul G Furtmüller, Stefan Hofbauer
Coproheme decarboxylases (ChdCs) are enzymes responsible for the catalysis of the terminal step in the coproporphyrin-dependent heme biosynthesis pathway. Phylogenetic analyses confirm that the gene encoding for ChdCs is widespread throughout the bacterial world. It is found in monoderm bacteria (Firmicutes, Actinobacteria), diderm bacteria (e. g. Nitrospirae) and also in Archaea. In order to test phylogenetic prediction ChdC representatives from all clades were expressed and examined for their coproheme decarboxylase activity...
January 10, 2018: Archives of Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29327280/comparison-of-the-ding-protein-from-the-archaeon-sulfolobus-solfataricus-with-human-phosphate-binding-protein-and-pseudomonas-fluorescence-ding-counterparts
#2
Elena Porzio, Anna De Maio, Teresa Ricciardi, Carmela Mistretta, Giuseppe Manco, Maria Rosaria Faraone-Mennella
DING proteins represent a new group of 40 kDa-related members, ubiquitous in living organisms. The family also include the DING protein from Sulfolobus solfataricus, functionally related to poly(ADP-ribose) polymerases. Here, the archaeal protein has been compared with the human Phosphate-Binding Protein and the Pseudomonas fluorescence DING enzyme, by enzyme assays and immune cross-reactivity. Surprisingly, as the Sulfolobus enzyme, the Human and Pseudomonas proteins display poly(ADP-ribose) polymerase activity, whereas a phosphatase activity was only present in Sulfolobus and human protein, despite the conserved phosphate-binding site residues in Pseudomonas DING...
January 11, 2018: Extremophiles: Life Under Extreme Conditions
https://www.readbyqxmd.com/read/29324789/an-l213a-variant-of-%C3%AE-glycosidase-from-sulfolobus-solfataricus-with-increased-%C3%AE-l-arabinofuranosidase-activity-converts-ginsenoside-rc-to-compound-k
#3
Ji-Hyeon Choi, Kyung-Chul Shin, Deok-Kun Oh
Compound K (C-K) is a crucial pharmaceutical and cosmetic component because of disease prevention and skin anti-aging effects. For industrial application of this active compound, the protopanaxadiol (PPD)-type ginsenosides should be transformed to C-K. β-Glycosidase from Sulfolobus solfataricus has been reported as an efficient C-K-producing enzyme, using glycosylated PPD-type ginsenosides as substrates. β-Glycosidase from S. solfataricus can hydrolyze β-d-glucopyranoside in ginsenosides Rc, C-Mc1, and C-Mc, but not α-l-arabinofuranoside in these ginsenosides...
2018: PloS One
https://www.readbyqxmd.com/read/29243852/functional-divergence-and-comparative-in-silico-study-of-cas4-proteins-of-duf83-class
#4
Vineeta Kaushik, Ved Vrat Verma, Manisha Goel
Clustered Regularly Interspaced Short Palindromic Repeats-CRISPR associated (CRISPR-Cas) systems present in genomes of bacteria and archaea have been the focus of many research studies recently. The Cas4 proteins of these systems are thought to be responsible for the adaptation step in the CRISPR mechanism. Cas4 proteins exhibit low sequence similarity among themselves and are currently classified into 2 main classes: DUF83 and DUF911. The characteristic features of Cas4 proteins belonging to DUF83 class have been elucidated by determining the structures of Cas4 protein from Sulfolobus solfataricus and Pyrobaculum calidifontis...
December 15, 2017: Journal of Molecular Recognition: JMR
https://www.readbyqxmd.com/read/29228332/prespacer-processing-and-specific-integration-in-a-type-i-a-crispr-system
#5
Clare Rollie, Shirley Graham, Christophe Rouillon, Malcolm F White
The CRISPR-Cas system for prokaryotic adaptive immunity provides RNA-mediated protection from viruses and mobile genetic elements. Adaptation is dependent on the Cas1 and Cas2 proteins along with varying accessory proteins. Here we analyse the process in Sulfolobus solfataricus, showing that while Cas1 and Cas2 catalyze spacer integration in vitro, host factors are required for specificity. Specific integration also requires at least 400 bp of the leader sequence, and is dependent on the presence of hydrolysable ATP, suggestive of an active process that may involve DNA remodelling...
December 8, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/29225512/development-of-the-multiple-gene-knockout-system-with-one-step-pcr-in-thermoacidophilic-crenarchaeon-sulfolobus-acidocaldarius
#6
Shoji Suzuki, Norio Kurosawa
Multiple gene knockout systems developed in the thermoacidophilic crenarchaeon Sulfolobus acidocaldarius are powerful genetic tools. However, plasmid construction typically requires several steps. Alternatively, PCR tailing for high-throughput gene disruption was also developed in S. acidocaldarius, but repeated gene knockout based on PCR tailing has been limited due to lack of a genetic marker system. In this study, we demonstrated efficient homologous recombination frequency (2.8 × 104 ± 6.9 × 103 colonies/μg DNA) by optimizing the transformation conditions...
2017: Archaea: An International Microbiological Journal
https://www.readbyqxmd.com/read/29224243/discovery-of-a-novel-thermostable-zn2-dependent-alcohol-dehydrogenase-from-chloroflexus-aurantiacus-through-conserved-domains-mining
#7
Christoph Loderer, David Wagner, Frances Morgenstern, Antje Spieß, Marion B Ansorge-Schumacher
AIMS: The purpose of the study was to demonstrate feasibility of the Conserved Domains Database (CDD) for identification of novel biocatalysts with desirable properties from a class of well-characterized biocatalysts. METHODS AND RESULTS: The thermostable ADH from Sulfolobus solfataricus with a broad substrate range was applied as a template for the search for novel thermostable ADHs via Conserved Domains Database. From the resulting hits, a putative ADH gene from the thermophilic organism Chloroflexus aurantiacus was cloned and expressed in E...
December 10, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/29212941/a-novel-sulfolobus-virus-with-an-exceptional-capsid-architecture
#8
Haina Wang, Zhenqian Guo, Hongli Feng, Yufei Chen, Xiuqiang Chen, Zhimeng Li, Walter Hernández-Ascencio, Xin Dai, Zhenfeng Zhang, Xiaowei Zheng, Marielos Mora-López, Yu Fu, Chuanlun Zhang, Ping Zhu, Li Huang
A novel archaeal virus, denoted Sulfolobus ellipsoid virus 1 (SEV1), was isolated from an acidic hot spring in Costa Rica. The morphologically unique virion of SEV1 contains a protein capsid with 16 regularly spaced striations and an 11-nm-thick envelope. The capsid exhibits an unusual architecture in which the viral DNA, probably in the form of a nucleoprotein filament, wraps around the longitudinal axis of the virion in a plane to form a multilayered disk-like structure with a central hole, and 16 of these structures are stacked to generate a spool-like capsid...
December 6, 2017: Journal of Virology
https://www.readbyqxmd.com/read/29211845/gene-deletions-leading-to-a-reduction-in-the-number-of-cyclopentane-rings-in-sulfolobus-acidocaldarius-tetraether-lipids
#9
Ziqiang Guan, Antonia Delago, Phillip Nußbaum, Benjamin H Meyer, Sonja-Verena Albers, Jerry Eichler
The cell membrane of (hyper)thermophilic archaea, including the thermoacidophile Sulfolobus acidocaldarius, incorporate dibiphytanylglycerol tetraether lipids. The hydrophobic cores of such tetraether lipids can include up to eight cyclopentane rings. Presently, nothing is known of the biosynthesis of these rings. In the present study, a series of S. acidocaldarius mutants deleted of genes currently annotated as encoding proteins involved in sugar/polysaccharide processing were generated and their glycolipids were considered...
November 29, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/29208997/experimental-maturation-of-archaea-encrusted-by-fe-phosphates
#10
J Miot, S Bernard, M Bourreau, F Guyot, A Kish
Burial is generally detrimental to the preservation of biological signals. It has often been assumed that (bio)mineral-encrusted microorganisms are more resistant to burial-induced degradation than non-encrusted ones over geological timescales. For the present study, we submitted Sulfolobus acidocaldarius experimentally encrusted by amorphous Fe phosphates to constrained temperature conditions (150 °C) under pressure for 1 to 5 days, thereby simulating burial-induced processes. We document the molecular and mineralogical evolution of these assemblages down to the sub-micrometer scale using X-ray diffraction, scanning and transmission electron microscopies and synchrotron-based X-ray absorption near edge structure spectroscopy at the carbon K-edge...
December 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29206193/every-ogt-is-illuminated-%C3%A2-by-fluorescent-and-synchrotron-lights
#11
REVIEW
Riccardo Miggiano, Anna Valenti, Franca Rossi, Menico Rizzi, Giuseppe Perugino, Maria Ciaramella
O⁶-DNA-alkyl-guanine-DNA-alkyl-transferases (OGTs) are evolutionarily conserved, unique proteins that repair alkylation lesions in DNA in a single step reaction. Alkylating agents are environmental pollutants as well as by-products of cellular reactions, but are also very effective chemotherapeutic drugs. OGTs are major players in counteracting the effects of such agents, thus their action in turn affects genome integrity, survival of organisms under challenging conditions and response to chemotherapy. Numerous studies on OGTs from eukaryotes, bacteria and archaea have been reported, highlighting amazing features that make OGTs unique proteins in their reaction mechanism as well as post-reaction fate...
December 5, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29203770/the-transcript-cleavage-factor-paralogue-tfs4-is-a-potent-rna-polymerase-inhibitor
#12
Thomas Fouqueau, Fabian Blombach, Ross Hartman, Alan C M Cheung, Mark J Young, Finn Werner
TFIIS-like transcript cleavage factors enhance the processivity and fidelity of archaeal and eukaryotic RNA polymerases. Sulfolobus solfataricus TFS1 functions as a bona fide cleavage factor, while the paralogous TFS4 evolved into a potent RNA polymerase inhibitor. TFS4 destabilises the TBP-TFB-RNAP pre-initiation complex and inhibits transcription initiation and elongation. All inhibitory activities are dependent on three lysine residues at the tip of the C-terminal zinc ribbon of TFS4; the inhibition likely involves an allosteric component and is mitigated by the basal transcription factor TFEα/β...
December 4, 2017: Nature Communications
https://www.readbyqxmd.com/read/29196634/rational-engineering-of-a-native-hyperthermostable-lactonase-into-a-broad-spectrum-phosphotriesterase
#13
Pauline Jacquet, Julien Hiblot, David Daudé, Céline Bergonzi, Guillaume Gotthard, Nicholas Armstrong, Eric Chabrière, Mikael Elias
The redesign of enzyme active sites to alter their function or specificity is a difficult yet appealing challenge. Here we used a structure-based design approach to engineer the lactonase SsoPox from Sulfolobus solfataricus into a phosphotriesterase. The five best variants were characterized and their structure was solved. The most active variant, αsD6 (V27A-Y97W-L228M-W263M) demonstrates a large increase in catalytic efficiencies over the wild-type enzyme, with increases of 2,210-fold, 163-fold, 58-fold, 16-fold against methyl-parathion, malathion, ethyl-paraoxon, and methyl-paraoxon, respectively...
December 1, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29177716/pcal_0632-a-phosphorylating-glyceraldehyde-3-phosphate-dehydrogenase-from-pyrobaculum-calidifontis
#14
Iram Aziz, Naeem Rashid, Raza Ashraf, Masood Ahmed Siddiqui, Tadayuki Imanaka, Muhammad Akhtar
Genome sequence of the hyperthermophilic archaeon Pyrobaculum calidifontis contains an open reading frame, Pcal_0632, annotated as glyceraldehyde-3-phosphate dehydrogenase, which is partially overlapped with phosphoglycerate kinase. In the phylogenetic tree, Pcal_0632 clustered with phosphorylating glyceraldehyde-3-phosphate dehydrogenases characterized from hyperthermophilic archaea and exhibited highest identity of 54% with glyceraldehyde-3-phosphate dehydrogenase from Sulfolobus tokodaii. To examine biochemical function of the protein, Pcal_0632 gene was expressed in Escherichia coli and the gene product was purified...
November 25, 2017: Extremophiles: Life Under Extreme Conditions
https://www.readbyqxmd.com/read/29167441/primer-synthesis-by-a-eukaryotic-like-archaeal-primase-is-independent-of-its-fe-s-cluster
#15
Sandro Holzer, Jiangyu Yan, Mairi L Kilkenny, Stephen D Bell, Luca Pellegrini
DNA replication depends on primase, the specialised polymerase responsible for synthesis of the RNA primers that are elongated by the replicative DNA polymerases. In eukaryotic and archaeal replication, primase is a heterodimer of two subunits, PriS and PriL. Recently, a third primase subunit named PriX was identified in the archaeon Sulfolobus solfataricus. PriX is essential for primer synthesis and is structurally related to the Fe-S cluster domain of eukaryotic PriL. Here we show that PriX contains a nucleotide-binding site required for primer synthesis, and demonstrate equivalence of nucleotide-binding residues in PriX with eukaryotic PriL residues that are known to be important for primer synthesis...
November 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/29163450/autophosphorylation-and-cross-phosphorylation-of-protein-kinases-from-the-crenarchaeon-sulfolobus-islandicus
#16
Qihong Huang, Qing Zhong, Joseph B A Mayaka, Jinfeng Ni, Yulong Shen
Protein phosphorylation, one of the most important post-translational modifications, regulates almost every cellular process. Although signal transduction by protein phosphorylation is extensively studied in Eukaryotes and Bacteria, the knowledge of this process in archaea is greatly lagging behind, especially for Ser/Thr/Tyr phosphorylation by eukaryotic-like protein kinases (ePKs). So far, only a few studies on archaeal ePKs have been reported, most of which focused on the phosphorylation activities in vitro, but their physiological functions and interacting network are still largely unknown...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29150511/sulfolobus-acidocaldarius-uptakes-pentoses-via-a-cut2-type-abc-transporter-and-metabolizes-them-through-the-aldolase-independent-weimberg-pathway
#17
Michaela Wagner, Lu Shen, Andreas Albersmeier, Nienke van der Kolk, Sujin Kim, Jaeho Cha, Christopher Bräsen, Jörn Kalinowski, Bettina Siebers, Sonja-Verena Albers
Sulfolobus spp. possess a great metabolic versatility and grow heterotrophically on various carbon sources such as different sugars and peptides. Known sugar transporters in Archaea predominantly belong to ABC transport systems. Although several ABC transporters for sugar uptake have been characterized in the crenarchaeon Sulfolobus solfataricus, only one homologue of these transporters, the maltose/maltooligomer transporter, could be identified in the closely related Sulfolobus acidocaldarius Comparison of the transcriptome of S...
November 17, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29143132/thermostable-and-highly-specific-l-aspartate-oxidase-from-thermococcus-litoralis-dsm-5473-cloning-overexpression-and-enzymological-properties
#18
Tsubasa Washio, Tadao Oikawa
We successfully expressed the L-aspartate oxidase homolog gene (accession no: OCC_06611) of Thermococcus litoralis DSM 5473 in the soluble fraction of Escherichia coli BL21 (DE3) using a pET21b vector with 6X His tag at its C-terminus. The gene product (Tl-LASPO) showed L-aspartate oxidase activity in the presence of FAD in vitro, and this report is the first that details an L-aspartate oxidase derived from a Thermococcus species. The homologs of Tl-LASPO existed mainly in archaea, especially in the genus of Thermococcus, Pyrococcus, Sulfolobus, and Halobacteria...
November 15, 2017: Extremophiles: Life Under Extreme Conditions
https://www.readbyqxmd.com/read/29123147/enzymatic-degradation-of-organophosphorus-insecticides-decreases-toxicity-in-planarians-and-enhances-survival
#19
Laetitia Poirier, Lucile Brun, Pauline Jacquet, Catherine Lepolard, Nicholas Armstrong, Cédric Torre, David Daudé, Eric Ghigo, Eric Chabrière
Organophosphorus insecticides (OPs) are toxic compounds used for agricultural purposes and responsible for severe types of contamination worldwide. OPs may also induce chronic deleterious effects and developmental disruption. Finding remediation strategies is a major concern to diminish their impact on environment and human health. Enzymes have emerged as a promising eco-friendly route for decontaminating OPs. The enzyme SsoPox from the archaea Sulfolobus solfataricus has been particularly studied, considering both its tremendous stability and phosphotriesterase activity...
November 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29118396/engineering-saccharomyces-cerevisiae-for-geranylgeraniol-overproduction-by-combinatorial-design
#20
Tian-Qing Song, Ming-Zhu Ding, Fang Zhai, Duo Liu, Hong Liu, Wen-Hai Xiao, Ying-Jin Yuan
Combinatorial design is an effective strategy to acquire the optimal solution in complex systems. In this study, the combined effects of pathway combination, promoters' strength fine-tuning, copy numbers and integration locus variations caused by δ-integration were explored in Saccharomyces cerevisiae using geranylgeraniol (GGOH) production as an example. Two GGOH biosynthetic pathway branches were constructed. In branch 1, GGOH was converted from isopentenyl pyrophosphate (IPP) and farnesyl diphosphate (FPP)...
November 8, 2017: Scientific Reports
keyword
keyword
25184
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"