Sodium-hydrogen exchange regulatory cofactor 2

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Solute carrier family 9 (sodium/hydrogen exchanger), member 3 regulator 2
PDB rendering based on 2he4.
Available structures: 2he4, 2ocs
Identifiers
Symbol(s) SLC9A3R2; SIP1; E3KARP; MGC104639; NHE3RF2; NHERF-2; NHERF2; OCTS2; SIP-1; TKA-1
External IDs OMIM: 606553 MGI: 1890662 HomoloGene: 56962
RNA expression pattern

More reference expression data
Orthologs
Human Mouse
Entrez 9351 65962
Ensembl ENSG00000065054 ENSMUSG00000002504
Uniprot Q15599 Q9JHL1
Refseq NM_004785 (mRNA)
NP_004776 (protein)		 NM_023055 (mRNA)
NP_075542 (protein)
Location Chr 16: 2.02 - 2.03 Mb Chr 17: 24.37 - 24.38 Mb
Pubmed search [1] [2]

Sodium-hydrogen exchange regulatory cofactor 2 (gene name SLC9A3R2; also known as NHERF-2 and Tyrosine kinase activator protein 1) is a human scaffold protein that connects plasma membrane proteins with members of the ezrin/moesin/radixin family and thereby helps to link them to the actin cytoskeleton and to regulate their surface expression. It is necessary for cAMP-mediated phosphorylation and inhibition of SLC9A3. May also act as scaffold protein in the nucleus.

This regulatory protein (factor) interacts with a sodium/hydrogen exchanger NHE3 (SLC9A3; MIM 182307) in the brush border membrane of the proximal tubule, small intestine, and colon that plays a major role in transepithelial sodium absorption. SLC9A3R2, as well as SLC9A3R1 (MIM 604990) and protein kinase A phosphorylation, may play a role in NHE3 regulation.[supplied by OMIM][1]

[edit] See also

[edit] References

  1. ^ Entrez Gene: SLC9A3R2 solute carrier family 9 (sodium/hydrogen exchanger), member 3 regulator 2.

[edit] Further reading

  • Poulat F, Barbara PS, Desclozeaux M, et al. (1997). "The human testis determining factor SRY binds a nuclear factor containing PDZ protein interaction domains.". J. Biol. Chem. 272 (11): 7167–72. PMID 9054412. 
  • Yun CH, Oh S, Zizak M, et al. (1997). "cAMP-mediated inhibition of the epithelial brush border Na+/H+ exchanger, NHE3, requires an associated regulatory protein.". Proc. Natl. Acad. Sci. U.S.A. 94 (7): 3010–5. PMID 9096337. 
  • Reczek D, Berryman M, Bretscher A (1998). "Identification of EBP50: A PDZ-containing phosphoprotein that associates with members of the ezrin-radixin-moesin family.". J. Cell Biol. 139 (1): 169–79. PMID 9314537. 
  • Hall RA, Ostedgaard LS, Premont RT, et al. (1998). "A C-terminal motif found in the beta2-adrenergic receptor, P2Y1 receptor and cystic fibrosis transmembrane conductance regulator determines binding to the Na+/H+ exchanger regulatory factor family of PDZ proteins.". Proc. Natl. Acad. Sci. U.S.A. 95 (15): 8496–501. PMID 9671706. 
  • Yun CH, Lamprecht G, Forster DV, Sidor A (1998). "NHE3 kinase A regulatory protein E3KARP binds the epithelial brush border Na+/H+ exchanger NHE3 and the cytoskeletal protein ezrin.". J. Biol. Chem. 273 (40): 25856–63. PMID 9748260. 
  • Imai K, Sarker AH, Akiyama K, et al. (1999). "Genomic structure and sequence of a human homologue (NTHL1/NTH1) of Escherichia coli endonuclease III with those of the adjacent parts of TSC2 and SLC9A3R2 genes.". Gene 222 (2): 287–95. PMID 9831664. 
  • Zizak M, Lamprecht G, Steplock D, et al. (1999). "cAMP-induced phosphorylation and inhibition of Na(+)/H(+) exchanger 3 (NHE3) are dependent on the presence but not the phosphorylation of NHE regulatory factor.". J. Biol. Chem. 274 (35): 24753–8. PMID 10455146. 
  • Hwang JI, Heo K, Shin KJ, et al. (2000). "Regulation of phospholipase C-beta 3 activity by Na+/H+ exchanger regulatory factor 2.". J. Biol. Chem. 275 (22): 16632–7. doi:10.1074/jbc.M001410200. PMID 10748023. 
  • Sun F, Hug MJ, Lewarchik CM, et al. (2000). "E3KARP mediates the association of ezrin and protein kinase A with the cystic fibrosis transmembrane conductance regulator in airway cells.". J. Biol. Chem. 275 (38): 29539–46. doi:10.1074/jbc.M004961200. PMID 10893422. 
  • Kanai F, Marignani PA, Sarbassova D, et al. (2001). "TAZ: a novel transcriptional co-activator regulated by interactions with 14-3-3 and PDZ domain proteins.". EMBO J. 19 (24): 6778–91. doi:10.1093/emboj/19.24.6778. PMID 11118213. 
  • Reczek D, Bretscher A (2001). "Identification of EPI64, a TBC/rabGAP domain-containing microvillar protein that binds to the first PDZ domain of EBP50 and E3KARP.". J. Cell Biol. 153 (1): 191–206. PMID 11285285. 
  • Takeda T, McQuistan T, Orlando RA, Farquhar MG (2001). "Loss of glomerular foot processes is associated with uncoupling of podocalyxin from the actin cytoskeleton.". J. Clin. Invest. 108 (2): 289–301. PMID 11457882. 
  • Yun CC, Chen Y, Lang F (2002). "Glucocorticoid activation of Na(+)/H(+) exchanger isoform 3 revisited. The roles of SGK1 and NHERF2.". J. Biol. Chem. 277 (10): 7676–83. doi:10.1074/jbc.M107768200. PMID 11751930. 
  • DeMarco SJ, Chicka MC, Strehler EE (2002). "Plasma membrane Ca2+ ATPase isoform 2b interacts preferentially with Na+/H+ exchanger regulatory factor 2 in apical plasma membranes.". J. Biol. Chem. 277 (12): 10506–11. doi:10.1074/jbc.M111616200. PMID 11786550. 
  • Ingraffea J, Reczek D, Bretscher A (2002). "Distinct cell type-specific expression of scaffolding proteins EBP50 and E3KARP: EBP50 is generally expressed with ezrin in specific epithelia, whereas E3KARP is not.". Eur. J. Cell Biol. 81 (2): 61–8. PMID 11893083. 
  • Kim JH, Lee-Kwon W, Park JB, et al. (2002). "Ca(2+)-dependent inhibition of Na+/H+ exchanger 3 (NHE3) requires an NHE3-E3KARP-alpha-actinin-4 complex for oligomerization and endocytosis.". J. Biol. Chem. 277 (26): 23714–24. doi:10.1074/jbc.M200835200. PMID 11948184. 
  • Li Y, Li J, Straight SW, Kershaw DB (2002). "PDZ domain-mediated interaction of rabbit podocalyxin and Na(+)/H(+) exchange regulatory factor-2.". Am. J. Physiol. Renal Physiol. 282 (6): F1129–39. doi:10.1152/ajprenal.00131.2001. PMID 11997330. 
  • Mahon MJ, Donowitz M, Yun CC, Segre GV (2002). "Na(+)/H(+ ) exchanger regulatory factor 2 directs parathyroid hormone 1 receptor signalling.". Nature 417 (6891): 858–61. doi:10.1038/nature00816. PMID 12075354. 
  • Sitaraman SV, Wang L, Wong M, et al. (2002). "The adenosine 2b receptor is recruited to the plasma membrane and associates with E3KARP and Ezrin upon agonist stimulation.". J. Biol. Chem. 277 (36): 33188–95. doi:10.1074/jbc.M202522200. PMID 12080047. 
  • Lamprecht G, Heil A, Baisch S, et al. (2002). "The down regulated in adenoma (dra) gene product binds to the second PDZ domain of the NHE3 kinase A regulatory protein (E3KARP), potentially linking intestinal Cl-/HCO3- exchange to Na+/H+ exchange.". Biochemistry 41 (41): 12336–42. PMID 12369822. 
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