LIN7B plays a crucial role in establishing and maintaining the asymmetric distribution of channels and receptors at the plasma membrane of polarized cells. It forms membrane-associated multiprotein complexes that regulate the delivery and recycling of proteins to the correct membrane domains . Specifically, the tripartite complex composed of LIN7 (LIN7A, LIN7B, or LIN7C), CASK, and APBA1 associates with the motor protein KIF17 to transport vesicles containing N-methyl-D-aspartate (NMDA) receptor subunit NR2B along microtubules .
This complex ensures the proper localization of GRIN2B (subunit 2B of the NMDA receptor) to neuronal postsynaptic density and may function in localizing synaptic vesicles at synapses where it is recruited by beta-catenin and cadherin . Additionally, LIN7B is required to localize Kir2 channels, GABA transporter (SLC6A12), and EGFR/ERBB1, ERBB2, ERBB3, and ERBB4 to the basolateral membrane of epithelial cells .
Recombinant human LIN7B protein is typically produced in Escherichia coli and purified using conventional chromatography techniques . The recombinant protein often includes an N-terminal His-tag and corresponds to the amino acids 1-207 of the human LIN7B . It is used in various research applications, including studies on protein-protein interactions, cell signaling, and synaptic function.
Recombinant LIN7B protein is used in various research applications, including: