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Protein Page:
SFRP1 (human)
p Phosphorylation
ac Acetylation
me Methylation
m1 Mono-methylation
m2 Di-methylation
m3 Tri-methylation
ub Ubiquitylation
sm Sumoylation
ne Neddylation
gl O-GlcNAc
ga O-GalNAc
pa Palmitoylation
ad Adenylation
sn S-Nitrosylation
ca Caspase cleavage
sc Succinylation

SFRP1 Soluble frizzled-related proteins (sFRPS) function as modulators of Wnt signaling through direct interaction with Wnts. They have a role in regulating cell growth and differentiation in specific cell types. SFRP1 decreases intracellular beta-catenin levels. Has antiproliferative effects on vascular cells, in vitro and in vivo, and can induce, in vivo, an angiogenic response. In vascular cell cycle, delays the G1 phase and entry into the S phase. In kidney development, inhibits tubule formation and bud growth in metanephroi. Inhibits WNT1/WNT4-mediated TCF-dependent transcription. Interacts with WNT1, WNT2 and FRZD6. Interacts with WNT4 and WNT8. Down-regulated in colorectal and breast tumors. Up- regulated in uterine leiomyomas under high estrogenic conditions. Expression, in leiomyomal cells, also increased both under hypoxic and serum deprivation conditions. Widely expressed. Absent from lung, liver and peripheral blood leukocytes. Highest levels in heart and fetal kidney. Also expressed in testis, ovary, fetal brain and lung, leiomyomal cells, myometrial cells and vascular smooth muscle cells. Expressed in foreskin fibroblasts and in keratinocytes. Belongs to the secreted frizzled-related protein (sFRP) family. Note: This description may include information from UniProtKB.
Protein type: Secreted, signal peptide; Secreted
Chromosomal Location of Human Ortholog: 8p11.21
Cellular Component: cell surface; cytosol; extracellular matrix; extracellular region; extracellular space; integral to membrane; intracellular; plasma membrane; proteinaceous extracellular matrix
Molecular Function: cysteine-type endopeptidase activity; drug binding; frizzled binding; G-protein coupled receptor activity; heparin binding; identical protein binding; protein binding; Wnt receptor activity; Wnt-protein binding
Biological Process: cellular response to starvation; digestive tract morphogenesis; dorsal/ventral axis specification; female gonad development; G-protein coupled receptor protein signaling pathway; hemopoietic progenitor cell differentiation; male gonad development; menstrual cycle phase; negative regulation of apoptosis; negative regulation of B cell differentiation; negative regulation of BMP signaling pathway; negative regulation of bone remodeling; negative regulation of cell growth; negative regulation of cell migration; negative regulation of cell proliferation; negative regulation of epithelial cell proliferation; negative regulation of fibroblast proliferation; negative regulation of insulin secretion; negative regulation of JNK activity; negative regulation of ossification; negative regulation of osteoblast differentiation; negative regulation of osteoblast proliferation; negative regulation of osteoclast differentiation; negative regulation of peptidyl-tyrosine phosphorylation; negative regulation of transcription, DNA-dependent; negative regulation of Wnt receptor signaling pathway; neural crest cell fate commitment; osteoblast differentiation; positive regulation of apoptosis; positive regulation of cell growth; positive regulation of cell proliferation; positive regulation of cell-matrix adhesion; positive regulation of epithelial cell proliferation; positive regulation of fat cell differentiation; positive regulation of focal adhesion formation; positive regulation of GTPase activity; positive regulation of smoothened signaling pathway; positive regulation of stress fiber formation; positive regulation of transcription, DNA-dependent; positive regulation of Wnt receptor signaling pathway; proteolysis; regulation of angiogenesis; response to drug; response to organic cyclic substance; somatic stem cell maintenance; ureteric bud development; Wnt receptor signaling pathway through beta-catenin
Reference #:  Q8N474 (UniProtKB)
Alt. Names/Synonyms: FRP; FRP-1; FRP1; FrzA; SARP-2; SARP2; Secreted apoptosis-related protein 2; Secreted frizzled-related protein 1; sFRP-1; SFRP1
Gene Symbols: SFRP1
Molecular weight: 35,386 Da
Basal Isoelectric point: 9.1  Predict pI for various phosphorylation states
CST Pathways:  Wnt/ß-Catenin Signaling
Protein-Specific Antibodies or siRNAs from Cell Signaling Technology® Total Proteins
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Protein Structure Not Found.

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Modification Sites and Domains Show Modification Legend
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Modification Sites in Parent Protein, Orthologs, and Isoforms Show Modification Legend

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LTP: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.


HTP: The number of records in which this modification site was assigned using ONLY proteomic discovery-mode mass spectrometry.


0 1 K224‑ac KKENGDkkIVPKKKk

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