- Volume 64, Issue Pt_6, 2014
Volume 64, Issue Pt_6, 2014
- New Taxa
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- Eukaryotic Micro-organisms
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Pseudozyma brasiliensis sp. nov., a xylanolytic, ustilaginomycetous yeast species isolated from an insect pest of sugarcane roots
A novel ustilaginomycetous yeast isolated from the intestinal tract of an insect pest of sugarcane roots in Ribeirão Preto, São Paulo State, Brazil, represents a novel species of the genus Pseudozyma based on molecular analyses of the D1/D2 rDNA large subunit and the internal transcribed spacer (ITS1+ITS2) regions. The name Pseudozyma brasiliensis sp. nov. is proposed for this species, with GHG001T ( = CBS 13268T = UFMG-CM-Y307T) as the type strain. P. brasiliensis sp. nov. is a sister species of Pseudozyma vetiver, originally isolated from leaves of vetiver grass and sugarcane in Thailand. P. brasiliensis sp. nov. is able to grow well with xylan as the sole carbon source and produces high levels of an endo-1,4-xylanase that has a higher specific activity in comparison with other eukaryotic xylanases. This enzyme has a variety of industrial applications, indicating the great biotechnological potential of P. brasiliensis.
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Two novel Saccharomycopsis species isolated from black olive brines and a tropical plant. Description of Saccharomycopsis olivae f. a., sp. nov. and Saccharomycopsis guyanensis f. a., sp. nov. Reassignment of Candida amapae to Saccharomycopsis amapae f. a., comb. nov., Candida lassenensis to Saccharomycopsis lassenensis f. a., comb. nov. and Arthroascus babjevae to Saccharomycopsis babjevae f. a., comb. nov.
More LessThree yeast strains related to members of the genus Saccharomycopsis were isolated. One strain (CLIB 1310) was isolated from olive brines of fermented black olives in France and two strains (CLIB 1454 and CLIB 1455) were isolated from a plant in French Guiana. Sequence analyses based on the D1/D2 domains of the nuclear large subunit rRNA gene, small-subunit rRNA gene and partial EF-1α gene revealed that the strains represented two novel taxa exhibiting extensive sequence divergence from the previously described species of the genus Saccharomycopsis. Two novel species are described to accommodate these newly isolated strains: Saccharomycopsis olivae sp. nov. (type strain CLIB 1310T = CBS 12701T) and Saccharomycopsis guyanensis sp. nov. (type strain CLIB 1455T = CBS 12914T and strain CLIB 1454). Both strains CLIB 1454 and CLIB 1455T displayed identical sequences but differed in their ability to metabolize sorbitol and in their morphology on agar medium. Candida amapae, Candida lassensensis and Arthroascus babjevae belonging to the Saccharomycopsis clade, are reassigned to Saccharomycopsis as novel combinations.
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- Evolution, Phylogeny and Biodiversity
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Molecular signatures for members of the genus Dehalococcoides and the class Dehalococcoidia
More LessThe bacteria belonging to the class Dehalococcoidia , due to their ability to dehalogenate chlorinated compounds, are of much interest for bioremediation of contaminated sites. We report here comparative analyses on different genes/proteins from the genomes of members of the class Dehalococcoidia . These studies have identified numerous novel molecular markers in the forms of conserved signature indels (CSIs) in broadly distributed proteins and conserved signature genes/proteins (CSPs), which are uniquely found in members of the class Dehalococcoidia , but except for an isolated exception, they are not found in other sequenced bacterial genomes. Of these molecular markers, nine CSIs in divergent proteins and 19 CSPs are specific for members of the genera Dehalococcoides and Dehalogenimonas , providing potential molecular markers for the bacterial class Dehalococcoidia . Additionally, four CSIs in divergent proteins and 28 CSPs are only found in all members of the genus Dehalococcoides for which genome sequences are available, but they are absent in Dehalogenimonas lykanthroporepellens and in other bacteria. The gene sequences of several of these CSPs exhibiting specificity for the genus Dehalococcoides or the class Dehalococcoidia are highly conserved and PCR primers based upon them provide a novel means for identification of other related bacteria. Two other CSIs identified in this study in the SecD and aspartate carbomyltransferase proteins weakly support an affiliation of the class Dehalococcoidia with the other members of the phylum Chloroflexi.
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Volumes and issues
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Volume 74 (2024)
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