Influence of humic acid on the p-tert-Butylphenol removal efficiency by Spirodela polyrhiza-Tas13 association.

Plant-microbe remediation technique is considered as a promising technology in removal of organic pollutants and its remediation efficiency is largely affected by a variety of surrounding environmental factors. Humic acid (HA) is the complex organic substance ubiquitous in environment, which characterized by its surfactant-like micelle microstructure and various reaction activity. In our study, a plant-microbe association with high p-tert-Butylphenol (PTBP) degradation potential constructed by Spirodela polyrhiza and Sphingobium phenoxybenzoativorans Tas13 has been used, and the influence of HA on the PTBP degradation efficiency of S. polyrhiza-Tas13 association was investigated. The result showed that the presence of HA greatly improved PTBP removal efficiency of S. polyrhiza-Tas13. The reason accounted for this may be due to the presence of HA promoted bacterial cell propagation, altered bacterial cell wall permeability, increased catechol 2,3-dioxygenase (C23O) enzyme activity of strain Tas13, rather than increasing the colonization ability of strain Tas13 on to the root surface. This study will greatly facilitate the application of aquatic plant-microbe association in environmental remediation.

Pancancer analysis of SKA1 mutation and its association with the diagnosis and prognosis of human cancers.

This study aims to explore the role of SKA1 in cancer diagnosis and prognosis and to investigate the mechanism by which SKA1 affects the malignant behaviors of ovarian cancer. Herein, we analyzed the oncogenic role of SKA1 at pan-cancer level by multiple informatics databases and verified the analysis by in vitro experiments. As a result, SKA1 was upregulated across cancers and was related to poor clinical outcome and immune infiltration. Specifically, the constructed nomogram showed superior performance in predicting the prognosis of epithelial ovarian cancer patients. Furthermore, the in vitro experiments revealed that silencing SKA1 significantly inhibited the proliferation, migratory ability and enhanced the cisplatin sensitivity of ovarian cancer cells. Therefore, we explored the oncogenic and potential therapeutic role of SKA1 across cancers through multiple bioinformatic analysis and revealed that SKA1 may promote ovarian cancer progression and chemoresistance to cisplatin by activating the AKT-FOXO3a signaling pathway.

[Expression and purification of membrane immunogens of Treponema pallidum in Pichia pastoris].

Genes of Treponema pallidum subsp. pallidum three membrane antigens (47kDa, 17kDa and 15kDa) were amplified by PCR with the template of the genomic DNA of Nichols strain and cloned into plasmid pPICZ B, the recombinant plasmids of pTP47, pTP17 and pTP15 were transformed into Pichia pastoris GS115. Recombinant antigens were expressed by the methanol induction and confirmed by the Western blot assay. Fusion antigens with 6 x His tag were purified using Ni-NTA agarose, and purified fusion protein yields were 4.8mg/L, 6.6mg/L and 25mg/L of cell culture for His-TP15, His-TP17 and His-TP47, respectively. Purity of all three antigens were more than 96% by SDS-PAGE assay. Particularly, His-TP17 was more about 6kDa molecular weight than that of expected probably because of glycosylation in Pichia pastoris. At last, these recombinant antigens were evaluated by ELISA assay with serum from syphilis patient and healthy blood donors, all three antigens showed strong sensitivity and specificity. So three membrane antigens of Treponema pallidum were expressed and purified fused with 6 x His tag in Pichia pastoris for the first time. The immunoreactivity results showed that all of which can be applied to diagnosis of Treponema pallidum, especially to diagnosis method based on combined two or three antigens.