Recombinant Xenopus laevis Nuclease-sensitive element-binding protein 1 (ybx1)

DNA- and RNA-binding protein involved in various processes, such as translational repression, RNA stabilization, mRNA splicing and transcription regulation. Binds preferentially to the 5'-[CU]CUGCG-3' RNA motif and specifically recognizes mRNA transcripts modified by C5-methylcytosine (m5C). Promotes mRNA stabilization: acts by binding to m5C-containing mRNAs and preventing mRNA decay. Plays a role in the maternal-to-zygotic transition in early embryo by binding to m5C-containing maternal mRNAs and preventing their degradation. Also promotes maternal-to-zygotic transition in oocytes and embryos by promoting translation repression; molecular mechanisms governing translation repression are unknown. Plays a key role in RNA composition of extracellular exosomes by defining the sorting of small non-coding RNAs, such as tRNAs, Y RNAs, Vault RNAs and miRNAs. Probably sorts RNAs in exosomes by recognizing and binding C5-methylcytosine (m5C)-containing RNAs. Acts as a key effector of epidermal progenitors by preventing epidermal progenitor senescence: acts by regulating the translation of a senescence-associated subset of cytokine mRNAs, possibly by binding to m5C-containing mRNAs. Also involved in pre-mRNA alternative splicing regulation: binds to splice sites in pre-mRNA and regulates splice site selection. Also able to bind DNA and regulate transcription. Binds to promoters that contain a Y-box (5'-CTGATTGGCCAA-3'). Promotes separation of DNA strands that contain mismatches or are modified by cisplatin. Has endonucleolytic activity and can introduce nicks or breaks into double-stranded DNA, suggesting a role in DNA repair. The secreted form acts as an extracellular mitogen and stimulates cell migration and proliferation.