Anti-EIF3A Antibody Picoband® Fluoro550 Conjugated

Eukaryotic translation initiation factor 3 subunit A (eIF3a) is a protein that in humans is encoded by the EIF3A gene. Enables RNA binding activity. Contributes to translation initiation factor activity. Involved in IRES-dependent viral translational initiation; formation of cytoplasmic translation initiation complex; and viral translational termination-reinitiation. Located in cytosol; nucleolus; and nucleoplasm. Part of eukaryotic translation initiation factor 3 complex.

Isoform 2 and isoform 3 function as proton-gated sodium channels; they are activated by a drop of the extracellular pH and then become rapidly desensitized. The channel generates a biphasic current with a fast inactivating and a slow sustained phase. Has high selectivity for sodium ions and can also transport lithium ions with high efficiency. Isoform 2 can also transport potassium, but with lower efficiency. It is nearly impermeable to the larger rubidium and cesium ions. Isoform 3 can also transport calcium ions. Mediates glutamate-independent Ca2+entry into neurons upon acidosis. This Ca2+overloading is toxic for cortical neurons and may be in part responsible for ischemic brain injury. Heteromeric channel assembly seems to modulate channel properties. Functions as a postsynaptic proton receptor that influences intracellular Ca2+concentration and calmodulin-dependent protein kinase II phosphorylation and thereby the density of dendritic spines. Modulates activity in the circuits underlying innate fear.

1. Ensinger, C., Obrist, P., Mikuz, G., Merkx, G., Smeets, D., Banziger, R., Bachmann, F., Burger, M. Assignment of the p150 subunit of the eukaryotic initiation factor 3A gene (EIF3A) to human chromosome band 10q26 by in situ hybridisation. Cytogenet. Cell Genet. 83: 74-75, 1998. 2. Holz, M. K., Ballif, B. A., Gygi, S. P., Blenis, J. mTOR and S6K1 mediate assembly of the translation preinitiation complex through dynamic protein interchange and ordered phosphorylation events. Cell 123: 569-580, 2005. 3. Johnson, K. R., Merrick, W. C., Zoll, W. L., Zhu, Y. Identification of cDNA clones for the large subunit of eukaryotic translation initiation factor 3: comparison of homologues from human, Nicotiana tabacum, Caenorhabditis elegans, and Saccharomyces cerevisiae. J. Biol. Chem. 272: 7106-7113, 1997.