Nephrin family interactions (Homo sapiens)

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3, 10, 12, 13, 15...4, 301, 7, 284, 11, 19, 202, 18, 25, 26, 318, 15, 19, 22, 27...6, 13, 16, 215, 149, 14, 24cytosolNPHS1-1 adherensjunction-associatedproteinsFYN KIRREL3 FYN PIK3R1 NEPH1:p-Nephrin:FynKIRREL-1 p-Y1158,Y1176,Y1193,Y1217-NPHS1-1 PIK3CA FYN Alpha-actinin FYN Alpha-actinin FYNKIRREL-1 Nephrin dimer:IQGAP1p-Y1158,Y1176,Y1193,Y1217-NPHS1-1 N-WASP Podocin oligomerNPHS1-1PIK3R2 NEPH2/NEPH3ADPSPTBN1 CASK KIRREL-1 KIRREL-1 Nephrin dimerp-Y1158,Y1176,Y1193,Y1217-NPHS1-1 MAGI2 MAGI2 KIRREL-1 KIRREL-1 PI3KNPHS1-1 ATPFYN KIRREL-1 CD2AP FYN NPHS1-1 IQGAP1 KIRREL-1 PIK3CB NCK1 CD2AP CASKKIRREL-1CD2APPIK3R1 Nephrin dimer:NEPH1KIRREL3 NPHS1-1 NCK1 p-Y1158,Y1176,Y1193,Y1217-NPHS1-1 KIRREL-1 KIRREL2 NPHS1-1 NPHS1-1 NPHS1-1 Nephrindimer:NEPH2/NEPH3NPHS1-1 KIRREL2 IQGAP1NPHS1-1 CD2AP:p-Nephrin:Fyn:NEPH1NPHS1-1 NCK1,NCK2NPHS1-1 SPTAN1 SPTBN1 PI3K:CD2AP:p-Nephrin:Fyn:NEPH1NEPH1:p-Nephrin:Fyn:NCK:N-WASPNephrindimer:adherinsjunction-associatedproteinsPodocin oligomer NCK2 PIK3CB NCK1 Nephrin dimer:CASKPIK3CA NPHS1-1 PIK3R2 p-Y1158,Y1176,Y1193,Y1217-NPHS1-1 NCK2 KIRREL-1 NEPH1:p-Nephrin:Fyn:NCKPodocin:p-Nephrin:Fyn:NEPH1SPTAN1 p-Y1158,Y1176,Y1193,Y1217-NPHS1-1 N-WASPNCK2


Description

Nephrin is a member of the Super-IgG-Molecule family and is most prominently expressed in kidney podocytes. It is a major if not the most important structural component of the slit diaphragm, a modified adherens junction in between these cells. Nephrin is composed of an extracellular domain with eight distal IgG like domains and one proximal fibronectin type III domain, a transmembrane domain and a short intracellular domain. Nephrin molecules show both homophilic and heterophilic interactions. Among heterophilic interaction partners slit diaphragm proteins such as NEPH1, NEPH2 and NEPH3 were shown to stabilize the slit diaphragm structure. Intracellularly Podocin, CD2 associated protein (CD2AP) and adherins junction associated proteins like IQGAP, MAGI, CASK and spectrins were all shown to interact with nephrin. Hence nephrin seems to play a major role in organizing the molecular structure of the slit diaphragm itself and via its binding partners links it to the actin cytoskeleton. Nephrin does not only fulfill static properties within the slit diaphragm but by tyrosine phosphorylation of its cytoplasmic tail by the Src kinase Fyn it initiates the PI3K AKT signaling cascade which seems to promote antiapoptotic signals. View original pathway at:Reactome.

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Bibliography

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History

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CompareRevisionActionTimeUserComment
114888view16:40, 25 January 2021ReactomeTeamReactome version 75
113334view11:40, 2 November 2020ReactomeTeamReactome version 74
112545view15:51, 9 October 2020ReactomeTeamReactome version 73
101459view11:32, 1 November 2018ReactomeTeamreactome version 66
100997view21:11, 31 October 2018ReactomeTeamreactome version 65
100533view19:45, 31 October 2018ReactomeTeamreactome version 64
100080view16:30, 31 October 2018ReactomeTeamreactome version 63
99631view15:01, 31 October 2018ReactomeTeamreactome version 62 (2nd attempt)
99237view12:44, 31 October 2018ReactomeTeamreactome version 62
94496view09:02, 14 September 2017Mkutmonreactome version 61
88033view13:34, 25 July 2016RyanmillerOntology Term : 'signaling pathway' added !
86623view09:22, 11 July 2016ReactomeTeamreactome version 56
83128view10:03, 18 November 2015ReactomeTeamVersion54
81468view13:00, 21 August 2015ReactomeTeamVersion53
76942view08:21, 17 July 2014ReactomeTeamFixed remaining interactions
76647view12:01, 16 July 2014ReactomeTeamFixed remaining interactions
75977view10:03, 11 June 2014ReactomeTeamRe-fixing comment source
75680view11:00, 10 June 2014ReactomeTeamReactome 48 Update
75035view13:54, 8 May 2014AnweshaFixing comment source for displaying WikiPathways description
74679view08:44, 30 April 2014ReactomeTeamReactome46
42085view21:55, 4 March 2011MaintBotAutomatic update
39893view05:55, 21 January 2011MaintBotNew pathway

External references

DataNodes

View all...
NameTypeDatabase referenceComment
ADPMetaboliteCHEBI:16761 (ChEBI)
ATPMetaboliteCHEBI:15422 (ChEBI)
Alpha-actinin R-HSA-451402 (Reactome)
CASK ProteinO14936 (Uniprot-TrEMBL)
CASKProteinO14936 (Uniprot-TrEMBL)
CD2AP ProteinQ9Y5K6 (Uniprot-TrEMBL)
CD2AP:p-Nephrin:Fyn:NEPH1ComplexR-HSA-373680 (Reactome)
CD2APProteinQ9Y5K6 (Uniprot-TrEMBL)
FYN ProteinP06241 (Uniprot-TrEMBL)
FYNProteinP06241 (Uniprot-TrEMBL)
IQGAP1 ProteinP46940 (Uniprot-TrEMBL)
IQGAP1ProteinP46940 (Uniprot-TrEMBL)
KIRREL-1 ProteinQ96J84-1 (Uniprot-TrEMBL)
KIRREL-1ProteinQ96J84-1 (Uniprot-TrEMBL)
KIRREL2 ProteinQ6UWL6 (Uniprot-TrEMBL)
KIRREL3 ProteinQ8IZU9 (Uniprot-TrEMBL)
MAGI2 ProteinQ86UL8 (Uniprot-TrEMBL)
N-WASP ProteinO00401 (Uniprot-TrEMBL)
N-WASPProteinO00401 (Uniprot-TrEMBL)
NCK1 ProteinP16333 (Uniprot-TrEMBL)
NCK1,NCK2ComplexR-HSA-381949 (Reactome)
NCK2 ProteinO43639 (Uniprot-TrEMBL)
NEPH1:p-Nephrin:Fyn:NCK:N-WASPComplexR-HSA-532605 (Reactome)
NEPH1:p-Nephrin:Fyn:NCKComplexR-HSA-373677 (Reactome)
NEPH1:p-Nephrin:FynComplexR-HSA-374555 (Reactome)
NEPH2/NEPH3ComplexR-HSA-936056 (Reactome)
NPHS1-1 ProteinO60500-1 (Uniprot-TrEMBL)
NPHS1-1ProteinO60500-1 (Uniprot-TrEMBL)
Nephrin dimer:NEPH2/NEPH3ComplexR-HSA-451719 (Reactome)
Nephrin

dimer:adherins junction-associated

proteins		ComplexR-HSA-451387 (Reactome)
Nephrin dimer:CASKComplexR-HSA-373681 (Reactome)
Nephrin dimer:IQGAP1ComplexR-HSA-451398 (Reactome)
Nephrin dimer:NEPH1ComplexR-HSA-373679 (Reactome)
Nephrin dimerComplexR-HSA-373670 (Reactome)
PI3K:CD2AP:p-Nephrin:Fyn:NEPH1ComplexR-HSA-451720 (Reactome)
PI3KComplexR-HSA-74693 (Reactome)
PIK3CA ProteinP42336 (Uniprot-TrEMBL)
PIK3CB ProteinP42338 (Uniprot-TrEMBL)
PIK3R1 ProteinP27986 (Uniprot-TrEMBL)
PIK3R2 ProteinO00459 (Uniprot-TrEMBL)
Podocin oligomer R-HSA-451771 (Reactome)
Podocin oligomerR-HSA-451771 (Reactome)
Podocin:p-Nephrin:Fyn:NEPH1ComplexR-HSA-373691 (Reactome)
SPTAN1 ProteinQ13813 (Uniprot-TrEMBL)
SPTBN1 ProteinQ01082 (Uniprot-TrEMBL)
adherens

junction-associated

proteins		ComplexR-HSA-451386 (Reactome)
p-Y1158,Y1176,Y1193,Y1217-NPHS1-1 ProteinO60500-1 (Uniprot-TrEMBL)

Annotated Interactions

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SourceTargetTypeDatabase referenceComment
ADPArrowR-HSA-373747 (Reactome)
ATPR-HSA-373747 (Reactome)
CASKR-HSA-373722 (Reactome)
CD2AP:p-Nephrin:Fyn:NEPH1ArrowR-HSA-373727 (Reactome)
CD2AP:p-Nephrin:Fyn:NEPH1R-HSA-451758 (Reactome)
CD2APR-HSA-373727 (Reactome)
FYNR-HSA-373747 (Reactome)
FYNmim-catalysisR-HSA-373747 (Reactome)
IQGAP1R-HSA-451377 (Reactome)
KIRREL-1R-HSA-373714 (Reactome)
N-WASPR-HSA-532603 (Reactome)
NCK1,NCK2R-HSA-373724 (Reactome)
NEPH1:p-Nephrin:Fyn:NCK:N-WASPArrowR-HSA-532603 (Reactome)
NEPH1:p-Nephrin:Fyn:NCKArrowR-HSA-373724 (Reactome)
NEPH1:p-Nephrin:Fyn:NCKR-HSA-532603 (Reactome)
NEPH1:p-Nephrin:FynArrowR-HSA-373747 (Reactome)
NEPH1:p-Nephrin:FynR-HSA-373724 (Reactome)
NEPH1:p-Nephrin:FynR-HSA-373727 (Reactome)
NEPH1:p-Nephrin:FynR-HSA-373734 (Reactome)
NEPH2/NEPH3R-HSA-451757 (Reactome)
NPHS1-1R-HSA-373732 (Reactome)
Nephrin dimer:NEPH2/NEPH3ArrowR-HSA-451757 (Reactome)
Nephrin

dimer:adherins junction-associated

proteins		ArrowR-HSA-451403 (Reactome)
Nephrin dimer:CASKArrowR-HSA-373722 (Reactome)
Nephrin dimer:IQGAP1ArrowR-HSA-451377 (Reactome)
Nephrin dimer:NEPH1ArrowR-HSA-373714 (Reactome)
Nephrin dimer:NEPH1R-HSA-373722 (Reactome)
Nephrin dimer:NEPH1R-HSA-373747 (Reactome)
Nephrin dimer:NEPH1R-HSA-451377 (Reactome)
Nephrin dimer:NEPH1R-HSA-451403 (Reactome)
Nephrin dimerArrowR-HSA-373732 (Reactome)
Nephrin dimerR-HSA-373714 (Reactome)
Nephrin dimerR-HSA-451757 (Reactome)
PI3K:CD2AP:p-Nephrin:Fyn:NEPH1ArrowR-HSA-451758 (Reactome)
PI3KR-HSA-451758 (Reactome)
Podocin oligomerR-HSA-373734 (Reactome)
Podocin:p-Nephrin:Fyn:NEPH1ArrowR-HSA-373734 (Reactome)
R-HSA-373714 (Reactome) Nephrin forms heterodimers with NEPH1 molecules in a cis-configuration within the SD. This heterologous protein protein interaction seems to be an important factor in maintaining the normal permeability characteristics of the slit diaphragm by relaying signals from the extracellular side into the podocyte. Interestingly, the Nephrin-NEPH heterodimer formation is highly conserved from C.elegans to human and serves different functions in different species and different tissues.
R-HSA-373722 (Reactome) CASK is a scaffolding protein that participates in maintenance of polarized epithelial cell architecture by linking membrane proteins and signaling molecules to the actin cytoskeleton. CASK is identified as one of the binding partners of nephrin and this interaction likely plays an important role in establishing the structural integrity and functional properties of the glomerular slit diaphragm.
R-HSA-373724 (Reactome) Nephrin tyrosine phosphorylation regulates podocyte cell morphology via NCK adaptor proteins. NCK via its SH2 domain interacts with the three phosphotyrosines (1176, 1193 and 1217) on nephrin, and through its SH3 domain can recruit several other proteins involved in the regulation of the actin cytoskeleton such as N WASP, WIP, ARP2/3 and PAK to the slit diaphragm. The importance of this mechanism is the maintenance of the filtration barrier. When rapid actin polymerization and cytoskeletal reorganization is needed, for example during development or injury and repair, the level of nephrin phosphorylation increases and leads to recruitment of NCK and its downstream effectors to the cytoplasmic side of the slit diaphragm.
R-HSA-373727 (Reactome) CD2-associated protein (CD2AP) is an adapter molecule of the immunoglobulin superfamily that was first identified as an SH3-containing protein that binds to the cytoplasmic domain of CD2. In the glomerulus, CD2AP is located in the cytoplasm beneath the slit-diaphragm, where it binds to the cytoplasmic domain of nephrin. CD2AP acts as a linker protein and may be involved in connecting nephrin to the actin cytoskeleton in podocytes, although direct evidence of this is still lacking. Interaction with CD2AP might be important in the steady-state situation. In addition CD2AP can facilitate nephrin-induced PI3K-AKT signaling, a pathway that has been shown to be important for nephrin-mediated actin reorganization in podocytes and protection of podocytes from apoptosis.
R-HSA-373732 (Reactome) Foot processes are long slender, actin rich protrusions of the cytoplasm that are anchored to the glomerular basement membrane. Adjacent foot processes are laterally interconnected by a highly specialized cell cell junction, the so called slit diaphragm (SD). Nephrin is the critical structural component within the slit diaphragm. Nephrin molecules of adjacent foot processes from neighboring podocytes interact with each other in the middle of the slit diaphragm forming a filter with a zipper like structure and with pores just the size of albumin on both sides of the midline density.
R-HSA-373734 (Reactome) NPHS2 encodes podocin, a protein exclusively expressed in podocytes in developing and mature glomeruli. Podocin is a member of the stomatin protein family with a short N terminal domain, a membrane-anchoring region, and a cytosolic C-terminal domain. Podocin accumulates in an oligomeric form in lipid rafts of the slit diaphragm. The C-terminal domain of Podocin binds to the cytoplasmic domain of nephrin thus it may function as a scaffolding protein connecting nephrin with the actin cytoskeleton. Beside nephrin it was shown that podocin also interacts with several other SD proteins, hence forming functional microdomains
R-HSA-373747 (Reactome) Nephrin has eight putative phosphorylation sites, which nicely match with substrate sites for the Src kinase family. Nephrin, is tyrosine phosphorylated by the Src family tyrosine kinase, Fyn in developing and injured podocytes. Phosphorylation of three of these tyrosines (1176, 1193 and 1217) results in the formation of a preferred binding motif (YDXV) for the SH2 domain of the adaptor protein NCK, which is one of the bricks linking Nephrin to the cytoskeleton. Phosphorylation of tyrosine 1158 results in a binding motif for the p85 regulatory subunit of PI3K.
R-HSA-451377 (Reactome) IQGAP1, an effector protein of the small GTPases Rac1 and Cdc42 and a putative regulator of cell-cell adherens junctions, is expressed in podocytes at significant levels, and located in the immediate vicinity of the slit diaphragm. IQGAP1 is identified as one of the interacting partners of nephrin. This interaction takes place strictly and specifically between the C-terminal half of the nephrin intracellular domain and IQGAP1. IQGAP1 knock-out mouse does not have any obvious nephrotic phenotype, hence IQGAP1 function can either be substituted by other proteins or its role in vivo is much less important than that attributed to it from cell culture experiments.
R-HSA-451403 (Reactome) The nephrin-slit diaphragm protein complex contains a group of scaffolding proteins that function to connect junctional membrane proteins to the actin cytoskeleton and signaling cascades. By mass spectrometry four of the proteins identified, alphaII spectrin, betaII spectrin, alpha-actinin, and IQGAP1, represent adherens junction-associated proteins, and two, MAGI-2/S-SCAM and CASK, represent MAGUK family scaffolding proteins that associate with Ig superfamily proteins. The presence of these proteins in slit diaphragms and their association with nephrin suggests that they may form a scaffolding protein complex in the podocyte slit diaphragm and thus contribute to the regulation of ultrafiltration by binding slit membrane proteins and establishing their cytosolic connections.
R-HSA-451757 (Reactome) NEPH2 and NEPH3 specifically interact with the extracellular domains of nephrin in the slit diaphragm of podocytes and potentially other tissues as well (eg. brain). The functional significance of these interactions is unknown.
R-HSA-451758 (Reactome) The regulatory p85 subunit of PI3K recognizes and binds to both phosphorylated nephrin and its binding partner, CD2AP. By mutation analysis, nephrin Y1158 was shown to be necessary for the interaction. This interaction allows the catalytic subunit p110 to act on phospholipids of the inner leaflet of the cell membrane. This leads to downstream phosphorylation and inactivation of the apoptotic factor Bad via the serine-threonine kinase AKT.
R-HSA-532603 (Reactome) The NCK adaptor protein binds to a proline rich region on WASP and N-WASP through its SH3 domains and has been implicated in the recruitment of WASP/N-WASP to sites of tyrosine phosphorylation. NCK stimulates actin nucleation by N WASP:Arp2/3 complexes. Recruitment of NCK to phosphorylated YDxV sites on nephrin could therefore directly control the cytoskeletal actin architecture of podocytes.
adherens

junction-associated

proteins		R-HSA-451403 (Reactome)
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