RESUMO
Two novel yeast species were isolated from the guts of two different termite species. A new member of the genus Sugiyamaella was isolated from the hindgut and nest material of the lower Australian termite Mastotermes darwiniensis. The second novel yeast species, isolated from the higher termite Odontotermes obesus, was identified as a member of the genus Papiliotrema. Both yeast species were able to hydrolyse xylan, methylumbelliferyl ß-xylobiose and methylumbelliferyl ß-xylotriose. The ability to debranch different hemicellulose side chains and growth without the addition of external vitamins was observed. A symbiotic role of the novel yeast species is indicated, especially in respect to xylan degradation and the production of vitamins. Here, we describe these species as Sugiyamaella mastotermitis sp. nov., MycoBank 816574 (type strain MD39VT=DSM 100793T=CBS 14182T), and Papiliotrema odontotermitis f.a., sp. nov., MycoBank 816575 (type strain OO5T=DSM 100791T=CBS 14181T). Additionally, we transfer Candida qingdaonensis to the genus Sugiyamaella and propose the following combination: Sugiyamaella qingdaonensis f.a., comb. nov., MycoBank 816576.
Assuntos
Basidiomycota/classificação , Isópteros/microbiologia , Filogenia , Saccharomycetales/classificação , Animais , Austrália , Composição de Bases , Basidiomycota/genética , Basidiomycota/isolamento & purificação , DNA Fúngico/genética , Técnicas de Tipagem Micológica , Saccharomycetales/genética , Saccharomycetales/isolamento & purificação , Análise de Sequência de DNARESUMO
A general method is described that allows one to follow the surface display of recombinant proteins in Escherichia coli without having to use specific antibodies or enzymatic reactions. The method is based on cysteine-specific labeling through Michael addition to the double bond of maleimide and its derivatives, and takes advantage of the fact that naturally occurring surface proteins in E. coli contain no accessible cysteine residues. The method is easy to perform and could be simply applied to different analytic procedures including Western blot, spectral photometry, and flow cytometry. By using this new labeling method, single cells bearing a distinct protein at the surface could be selected by fluorescence-activated cell sorting. The data were obtained by using autodisplay, an efficient surface display system established for E. coli, but the method presented here represents rather a general solution for analyzing the surface display of recombinant proteins, independent of the cellular system used.