Project description:Strain SM1988T is a Gram-negative, aerobic, oxidase- and catalase-positive, unipolar flagellated, and rod-shaped bacterium capable of hydrolyzing casein, gelatin and collagens. Phylogenetic analysis revealed that strain SM1988T formed a distinct phylogenetic lineage along with known genera within the family Pseudoalteromonadaceae, with 16S rRNA gene sequence similarity being less than 93.3% to all known species in the family. Based on the phylogenetic, genomic, chemotaxonomic and phenotypic data, strain SM1988T was considered to represent a novel species in a novel genus in the family Pseudoalteromonadaceae, for which the name Flocculibacter collagenilyticus gen. nov., sp. nov. is proposed, with the type strain being SM1988T (= MCCC 1K04279T = KCTC 72761T). Strain SM1988T showed a high production (236 U/mL) of extracellular collagenases, which had high activity against both bovine collagen and codfish collagen. Biochemical tests combined with genomic and secretomic analyses indicated that the collagenases secreted by strain SM1988T are serine proteases from the S8 family. These data suggest that strain SM1988T acts as an important player in marine collagen degradation and recycling and may have a promising potential in collagen resource utilization.
Project description:Cytokines control the biology of hematopoietic stem and progenitor cells in part through the transcription factors STAT5a/b. CCN3/NOV has been reported as a positive regulator of hematopoietic stem and progenitor cells. We report microarray analyses of Lineage- Sca-1+ c-Kit+ (KSL) cells in the presence and absence of STAT5a/b. Expression of the ccn3 gene was induced over 100-fold in control, but not STAT5a/b-null cells, upon stimulation with a cocktail containing IL-3, IL-6, SCF, TPO and Flt3 ligand. Among the cytokines, IL-3 elevated ccn3 mRNA level in Lineage- c-Kit+ (KL) cells and 32D cells. ChIP assays using 32D cells revealed IL-3-induced binding of STAT5a/b to a GAS site in the ccn3 gene promoter. This is the first report to link two molecules with importance in the regulation of HSCs, CCN3 and STAT5a/b. We report that the regulation and expression of the ccn3 gene is directly controlled by IL-3 through the transcription factors STAT5a/b. Six Control and Six Stat5a/b-null KSL cells, including three biological replications, were unstimulated or stimulated with a cocktail containing IL-3, IL-6, SCF, TPO and FL.
Project description:Bryophytes comprise mosses, liverworts and hornworts. The chromatin landscapes of mosses and liverworts are different, leaving open the question regarding the identity of the chromatin landscape of all bryophytes. To address this question we profiled five chromatin marks using a model hornworts, Anthoceros agrestis.
