Nephrin, Recombinant Protein

For Research Use Only. Not for use in diagnostic procedures.

Chromosome: 19; NC_000019.9 (36316274..36342895, complement). Location: 19q13.1

Purified
85%, as determined by SDS-PAGE under reducing conditions and visualized by silver stain.

Supplied as a lyophilized powder in PBS. Reconstitute with sterile PBS to 0.1mg/ml.

Lyophilized powder may be stored at 4 degree C for short-term only. Reconstitute to nominal volume by adding sterile PBS and store at -20 degree C. Reconstituted product is stable for 12 months at -20 degree C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.

Small volumes of NPHS1 recombinant protein vial(s) may occasionally become entrapped in the seal of the product vial during shipment and storage. If necessary, briefly centrifuge the vial on a tabletop centrifuge to dislodge any liquid in the container`s cap. Certain products may require to ship with dry ice and additional dry ice fee may apply.

Nephrin is a 185kD type I transmembrane glycoprotein that belongs to the immunoglobulin superfamily (1). Mature mouse Nephrin consists of a 1042 amino acid (aa) extracellular domain (ECD) with eight Ig-like C2-set domains and one fibronectin type III domain, a 22 aa transmembrane segment, and a 156 aa cytoplasmic tail (2, 3). Within the ECD, mouse Nephrin shares 84% and 95% aa sequence identity with human and rat Nephrin, respectively. Usage of the alternate exon 1B results in a distinct N-terminal sequence that lacks a clearly defined signal peptide cleavage site (4). Nephrin is expressed primarily on podocytes in the renal glomerulus and to a lesser extent in the brain and pancreas (3, 5). The 1B isoform is not expressed in the kidney (4). Nephrin localizes to intercellular junctions between podocyte foot processes where it functions as a homophilic adhesion molecule (2, 6). Nephrin is required for formation and maintenance of the slit diaphragm between these processes (7). It associates with Neph1, podicin, P-cadherin, and multiple scaffolding proteins which couple it to the actin cytoskeleton (8-12). Nephrin expression is required for the anti-apoptotic effect of VEGF on podocytes as well as for the ability of podocytes to upregulate Glut1 and Glut4 glucose transporters in response to insulin (13, 14). Nephrin downregulation contributes to diabetic nephropathy, and Nephrin mutations underlie the lethal congenital nephritic syndrome NPHS1 (5, 15).

Molecular Biology; MB-Nephrin

Western Blot (WB)

Suitable for use in Western Blot.
Dilution: Western Blot: Predicted 110.0kD protein migrates as an ~ 130-145kD protein in SDS-PAGE under reducing conditions.

110.0kD[Similar Products]

nephrosis 1, congenital, Finnish type (nephrin)

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NPHN_HUMAN

This gene encodes a member of the immunoglobulin family of cell adhesion molecules that functions in the glomerular filtration barrier in the kidney. The gene is primarily expressed in renal tissues, and the protein is a type-1 transmembrane protein found at the slit diaphragm of glomerular podocytes. The slit diaphragm is thought to function as an ultrafilter to exclude albumin and other plasma macromolecules in the formation of urine. Mutations in this gene result in Finnish-type congenital nephrosis 1, characterized by severe proteinuria and loss of the slit diaphragm and foot processes.[provided by RefSeq, Oct 2009]

NPHS1: Seems to play a role in the development or function of the kidney glomerular filtration barrier. Regulates glomerular vascular permeability. May anchor the podocyte slit diaphragm to the actin cytoskeleton. Plays a role in skeletal muscle formation through regulation of myoblast fusion. Interacts with CD2AP (via C-terminal domain). Interacts with MAGI1 (via PDZ 2 and 3 domains) forming a tripartite complex with IGSF5/JAM4. Interacts with DDN; the interaction is direct. Self-associates (via the Ig-like domains). Also interacts (via the Ig-like domains) with KIRREL/NEPH1 and KIRREL2; the interaction with KIRREL is dependent on KIRREL glycosylation. Forms a complex with ACTN4, CASK, IQGAP1, MAGI2, SPTAN1 and SPTBN1. Interacts with NPHS2. Specifically expressed in podocytes of kidney glomeruli. Belongs to the immunoglobulin superfamily. 2 isoforms of the human protein are produced by alternative splicing.

Protein type: Membrane protein, integral; Cell adhesion; Immunoglobulin superfamily

Chromosomal Location of Human Ortholog: 19q13.1

Cellular Component: cell projection; protein complex; integral to plasma membrane; plasma membrane; lipid raft

Molecular Function: protein domain specific binding; protein binding; myosin binding; spectrin binding; alpha-actinin binding

Biological Process: skeletal muscle development; positive regulation of actin filament polymerization; glomerular basement membrane development; JNK cascade; cell adhesion; excretion; myoblast fusion

Disease: Nephrotic Syndrome, Type 1

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