FMR1 Recombinant Protein (OPCD03276)

FMR1

40 kDa

2332

Multifunctional polyribosome-associated RNA-binding protein that plays a central role in neuronal development and synaptic plasticity through the regulation of alternative mRNA splicing, mRNA stability, mRNA dendritic transport and postsynaptic local protein synthesis of a subset of mRNAs . Plays a role in the alternative splicing of its own mRNA . Plays a role in mRNA nuclear export. Together with export factor NXF2, is involved in the regulation of the NXF1 mRNA stability in neurons. Stabilizes the scaffolding postsynaptic density protein DLG4/PSD-95 and the myelin basic protein (MBP) mRNAs in hippocampal neurons and glial cells, respectively; this stabilization is further increased in response to metabotropic glutamate receptor (mGluR) stimulation. Plays a role in selective delivery of a subset of dendritic mRNAs to synaptic sites in response to mGluR activation in a kinesin-dependent manner. Plays a role as a repressor of mRNA translation during the transport of dendritic mRNAs to postnyaptic dendritic spines . Component of the CYFIP1-EIF4E-FMR1 complex which blocks cap-dependent mRNA translation initiation. Represses mRNA translation by stalling ribosomal translocation during elongation. Reports are contradictory with regards to its ability to mediate translation inhibition of MBP mRNA in oligodendrocytes . Also involved in the recruitment of the RNA helicase MOV10 to a subset of mRNAs and hence regulates microRNA (miRNA)-mediated translational repression by AGO2 . Facilitates the assembly of miRNAs on specific target mRNAs . Plays also a role as an activator of mRNA translation of a subset of dendritic mRNAs at synapses . In response to mGluR stimulation, FMR1-target mRNAs are rapidly derepressed, allowing for local translation at synapses. Binds to a large subset of dendritic mRNAs that encode a myriad of proteins involved in pre- and postsynaptic functions . Binds to 5'-ACU[GU]-3' and/or 5'-[AU]GGA-3' RNA consensus sequences within mRNA targets, mainly at coding sequence (CDS) and 3'-untranslated region (UTR) and less frequently at 5'-UTR . Binds to intramolecular G-quadruplex structures in the 5'- or 3'-UTRs of mRNA targets . Binds to G-quadruplex structures in the 3'-UTR of its own mRNA . Binds also to RNA ligands harboring a kissing complex (kc) structure; this binding may mediate the association of FMR1 with polyribosomes . Binds mRNAs containing U-rich target sequences . Binds to a triple stem-loop RNA structure, called Sod1 stem loop interacting with FMRP (SoSLIP), in the 5'-UTR region of superoxide dismutase SOD1 mRNA . Binds to the dendritic, small non-coding brain cytoplasmic RNA 1 (BC1); which may increase the association of the CYFIP1-EIF4E-FMR1 complex to FMR1 target mRNAs at synapses. Associates with export factor NXF1 mRNA-containing ribonucleoprotein particles (mRNPs) in a NXF2-dependent manner. Binds to a subset of miRNAs in the brain . May associate with nascent transcripts in a nuclear protein NXF1-dependent manner . In vitro, binds to RNA homopolymer; preferentially on poly(G) and to a lesser extent on poly(U), but not on poly(A) or poly(C) . Moreover, plays a role in the modulation of the sodium-activated potassium channel KCNT1 gating activity . Negatively regulates the voltage-dependent calcium channel current density in soma and presynaptic terminals of dorsal root ganglion (DRG) neurons, and hence regulates synaptic vesicle exocytosis. Modulates the voltage-dependent calcium channel CACNA1B expression at the plasma membrane by targeting the channels for proteosomal degradation. Plays a role in regulation of MAP1B-dependent microtubule dynamics during neuronal development. Recently, has been shown to play a translation-independent role in the modulation of presynaptic action potential (AP) duration and neurotransmitter release via large-conductance calcium-activated potassium (BK) channels in hippocampal and cortical excitatory neurons . Finally, FMR1 may be involved in the control of DNA damage response (DDR) mechanisms through the regulation of ATR-dependent signaling pathways such as histone H2AFX/H2A.x and BRCA1 phosphorylations .

20mM Tris, 150mM NaCl, pH8.0, containing 1mM EDTA, 1mM DTT, 0.01% SKL, 5% Trehalose and Proclin300.