Project description:The heterodimeric histone chaperone FACT consisting of SSRP1 and SPT16 contributes to dynamic nucleosome rearrangements during various DNA-dependent processes including transcription. In search of post-translational modifications that may regulate the activity of FACT, SSRP1 and SPT16 were isolated from Arabidopsis cells and analysed by mass spectrometry. Four acetylated lysine residues could be mapped within the basic C-terminal region of SSRP1, while three phosphorylated serine/threonine residues were identified in the acidic C-terminal region of SPT16. Mutational analysis of the SSRP1 acetylation sites revealed only mild effects. However, phosphorylation of SPT16 that is catalysed by protein kinase CK2, modulates histone interactions. A non-phosphorylatable version of SPT16 displayed reduced histone binding and (unlike the phosphorylatable wild-type and phosphomimic versions) proved inactive in complementing the growth and developmental phenotypes of spt16 mutant plants. In plants expressing the non-phosphorylatable SPT16 version we detected at a subset of genes enrichment of histone H3 directly upstream of RNA polymerase II transcriptional start sites (TSSs) in a region that usually is nucleosome-depleted. This is associated with altered transcript levels, suggesting that some genes require phosphorylation of the SPT16 acidic region for establishing the correct nucleosome occupancy at the TSS as a prerequisite for proper transcription.
Project description:Proteomic Analysis of the total proteome from Arabidopsis thaliana SUMO E3 Ligase mutants siz1-2 and mms21-1 and wild-type (Col-0) 8-day old seedlings
Project description:affy_l2bctv_ath - affy_l2bctv_ath - Geminivirus diseases are among the most important economic impact on crops, including beans, cassava, cotton, cucurbits, corn, peppers and tomatoes. Geminiviruses have a genome composed of one or two molecules of single-stranded DNA, depending on mono or bipartite. The BCTV genome consists of a single strand of DNA that contains six reading frames for proteins CP, V2, Rep, C2, Ren, and C4. To determine the mechanism by which C2 of BCTV induce genes, we performed transgenic Arabidopsis expressing BCTV C2. We are interesting to study the difference between the wild type and two mutants. -10 days old plants were grown in MS at 24 degrees in long day. We used the different lines: wt, L2.4 mutants and L2.5 mutants. We performed three repetitions each. Keywords: gene knock in (transgenic)
Project description:Methyl CpG Binding (MBD) proteins are a class of protein that binds with methylated DNA. In the model plant Arabidopsis thaliana there are 13 MBD proteins are there. To understand the gene regulation we performed microarray analysis of mutants of three genes (atmbd4, atmbd6 and atmbd11). Ten day old seedlings of these three mutant were compared with the wild type plants grown in same condition.
Project description:Microarray analysis of wild type plants and plants with reduced (ago1-27 and se-1) or increased miR156 levels (se-1 p35S:MIR156). Shoot apices were dissected from 20-day-old, short-day grown plants.
Project description:Transcriptional profiling of 6-day-old seedlings of Arabidopsis wild type control and zrf1 mutants is performed using Agilent's Whole Arabidopsis Gene Expression Microarray (4x44K).
Project description:Transcriptional profiling of 6-day-old seedlings of Arabidopsis wild type control and mutants is performed using Affymetrix IVT Arabidopsis ATH1 Genome Array.
Project description:Transcriptional profiling of 16-day-old seedlings of Arabidopsis wild type control and mutants is performed using Aligent’s Whole Arabidopsis Gene Expression Microarray (4x44K).
