Project description:Histone variant H2A.Z is a critical player in setting up the chromatin environment that mediates transcription and other activities on chromatin. However, how H2A.Z is incorporated to specific chromatin regions is not clear. To examine the potential role of sequence-specific transcription factors in targeting H2A.Z, we screened for genome-wide H2A.Z-interacting proteins in vivo using a novel technique called bait Protein-Protein Interaction-sequencing (bPPI-seq). Among the hundreds of H2A.Z-interacting proteins identified by bPPI-seq, we show that a zinc-finger transcription factor, Osr1 interacts with H2A.Z both in vitro and in vivo and co-localizes with H2A.Z on chromatin. Knockdown of Osr1 compromised H2A.Z deposition to hundreds of chromatin sites enriched with Osr1 binding motifs. Furthermore, Osr1 and H2A.Z co-regulate the expression of numerous target genes. These results indicate that Osr1 directly interacts with H2A.Z, mediates its incorporation to a large number of target sites and regulates gene expression. Our data indicate that bPPI-seq can be widely applied to identify unbiasedly interacting proteins under physiologic conditions.
Project description:The endothelial nitric oxide (NO) synthase (eNOS, or NOS3) can be activated in response to fluid shear stress and numerous agonists via cellular events such as increased intracellular Ca2+, interaction with substrate, co-factors as well as adaptor and regulatory proteins, protein phosphorylation and S-glutathionylation in addition to shuttling between distinct sub-cellular domains. While some protein interactors modulate enzymatic activity, others can be S-nitrosation targets, which are brought in close proximity to the NO source under specific conditions. The identification of proteins interacting with eNOS in human endothelial cells stimulated with serum and growth factors may provide new insight into the regulation of eNOS activity as well as NO signaling via S-nitrosation.
Project description:The goal of this study is to compare the mRNA interactome of different RBPs in regenerating axons utilizing RNA-immunoprecipitation (RIP). Interacting mRNAs to each target RBPs were co-immunoprecipitated from axoplasm of sciatic nerve, injured 7 days ago. Interactome of each RBPs were identified by Next-generation sequencing (NGS).
Project description:We performed IP-MS for identification of SETD1A FLOS domain interacting proteins. Proteins were separated by SDS-PAGE, and digested by in-gel digestion protocol.