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CD55 CD55 CR1 CR1 SUSD2 SUSD2 HP HP SUSD6 SUSD6 SUSD4 SUSD4 SELE SELE FBLN7 FBLN7 BCAN BCAN PAPPA PAPPA TPO TPO C7 C7 CFHR1 CFHR1 CD46 CD46 SEZ6 SEZ6 SNED1 SNED1 SUSD5 SUSD5 C2 C2 CSMD3 CSMD3 MASP1 MASP1 C1RL C1RL VCAN VCAN SELP SELP C6 C6 CFHR5 CFHR5 NCAN NCAN SEZ6L SEZ6L C4BPB C4BPB APOH APOH CFHR3 CFHR3 CFHR4 CFHR4 CFHR2 CFHR2 F13B F13B C4BPA C4BPA CR2 CR2 SELL SELL CSMD1 CSMD1 PAMR1 PAMR1 SEZ6L2 SEZ6L2 C1R C1R HPR HPR CR1L CR1L CFB CFB B4E1Z4_HUMAN B4E1Z4_HUMAN ACAN ACAN C1S C1S MASP2 MASP2 IL15RA IL15RA IL2RA IL2RA SRPX SRPX GABBR1 GABBR1 SUSD3 SUSD3 SVEP1 SVEP1 SUSD1 SUSD1 CSMD2 CSMD2 SRPX2 SRPX2 PAPPA2 PAPPA2 CFH CFH
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splice isoforms or post-translational modifications are collapsed, i.e. each node represents all the proteins produced by a single, protein-coding gene locus.
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query proteins and first shell of interactors
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second shell of interactors
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proteins of unknown 3D structure
filled nodes:
a 3D structure is known or predicted
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Known Interactions
from curated databases
experimentally determined
Predicted Interactions
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gene co-occurrence
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CD55Complement decay-accelerating factor; This protein recognizes C4b and C3b fragments that condense with cell-surface hydroxyl or amino groups when nascent C4b and C3b are locally generated during C4 and c3 activation. Interaction of daf with cell-associated C4b and C3b polypeptides interferes with their ability to catalyze the conversion of C2 and factor B to enzymatically active C2a and Bb and thereby prevents the formation of C4b2a and C3bBb, the amplification convertases of the complement cascade. Inhibits complement activation by destabilizing and preventing the formation of C3 and [...] (444 aa)
CR1Complement receptor type 1; Membrane immune adherence receptor that plays a critical role in the capture and clearance of complement-opsonized pathogens by erythrocytes and monocytes/macrophages. Mediates the binding by these cells of particles and immune complexes that have activated complement to eliminate them from the circulation. Acts also in the inhibition of spontaneous complement activation by impairing the formation and function of the alternative and classical pathway C3/C5 convertases, and by serving as a cofactor for the cleavage by factor I of C3b to iC3b, C3c and C3d,g, a [...] (2489 aa)
SUSD2Sushi domain-containing protein 2; May be a cytokine receptor for C10ORF99. May be a tumor suppressor; together with C10ORF99 has a growth inhibitory effect on colon cancer cells which includes G1 cell cycle arrest. May play a role in breast tumorigenesis. (822 aa)
HPHaptoglobin alpha chain; As a result of hemolysis, hemoglobin is found to accumulate in the kidney and is secreted in the urine. Haptoglobin captures, and combines with free plasma hemoglobin to allow hepatic recycling of heme iron and to prevent kidney damage. Haptoglobin also acts as an antioxidant, has antibacterial activity, and plays a role in modulating many aspects of the acute phase response. Hemoglobin/haptoglobin complexes are rapidly cleared by the macrophage CD163 scavenger receptor expressed on the surface of liver Kupfer cells through an endocytic lysosomal degradation pathway. (406 aa)
SUSD6Sushi domain-containing protein 6; May play a role in growth-suppressive activity and cell death. May be involved in the production of chemokine molecules in umbilical vein endothelial cells (HUVECs) cultured in THP1 monocyte LPS-induced medium. Plays a role in preventing tumor onset (By similarity). (303 aa)
SUSD4Sushi domain-containing protein 4; Acts as complement inhibitor by disrupting the formation of the classical C3 convertase. Isoform 3 inhibits the classical complement pathway, while membrane-bound isoform 1 inhibits deposition of C3b via both the classical and alternative complement pathways. (490 aa)
SELEE-selectin; Cell-surface glycoprotein having a role in immunoadhesion. Mediates in the adhesion of blood neutrophils in cytokine-activated endothelium through interaction with SELPLG/PSGL1. May have a role in capillary morphogenesis; Belongs to the selectin/LECAM family. (610 aa)
FBLN7Fibulin-7; An adhesion molecule that interacts with extracellular matrix molecules in developing teeth and may play important roles in differentiation and maintenance of odontoblasts as well as in dentin formation. (439 aa)
BCANBrevican core protein; May play a role in the terminally differentiating and the adult nervous system during postnatal development. Could stabilize interactions between hyaluronan (HA) and brain proteoglycans; Belongs to the aggrecan/versican proteoglycan family. (911 aa)
PAPPAPappalysin-1; Metalloproteinase which specifically cleaves IGFBP-4 and IGFBP-5, resulting in release of bound IGF. Cleavage of IGFBP-4 is dramatically enhanced by the presence of IGF, whereas cleavage of IGFBP-5 is slightly inhibited by the presence of IGF. Belongs to the peptidase M43B family. (1627 aa)
TPOThyroid peroxidase; Iodination and coupling of the hormonogenic tyrosines in thyroglobulin to yield the thyroid hormones T(3) and T(4). (933 aa)
C7Complement component C7; Constituent of the membrane attack complex (MAC) that plays a key role in the innate and adaptive immune response by forming pores in the plasma membrane of target cells. C7 serves as a membrane anchor; Belongs to the complement C6/C7/C8/C9 family. (843 aa)
CFHR1Complement factor H-related protein 1; Involved in complement regulation. The dimerized forms have avidity for tissue-bound complement fragments and efficiently compete with the physiological complement inhibitor CFH. Can associate with lipoproteins and may play a role in lipid metabolism. (330 aa)
CD46Membrane cofactor protein; Acts as a cofactor for complement factor I, a serine protease which protects autologous cells against complement-mediated injury by cleaving C3b and C4b deposited on host tissue. May be involved in the fusion of the spermatozoa with the oocyte during fertilization. Also acts as a costimulatory factor for T-cells which induces the differentiation of CD4+ into T-regulatory 1 cells. T-regulatory 1 cells suppress immune responses by secreting interleukin-10, and therefore are thought to prevent autoimmunity. (Microbial infection) Acts as a receptor for Adenovirus [...] (399 aa)
SEZ6Seizure protein 6 homolog; May play a role in cell-cell recognition and in neuronal membrane signaling. Seems to be important for the achievement of the necessary balance between dendrite elongation and branching during the elaboration of a complex dendritic arbor. Involved in the development of appropriate excitatory synaptic connectivity (By similarity). Belongs to the SEZ6 family. (994 aa)
SNED1Sushi, nidogen and EGF like domains 1. (1413 aa)
SUSD5Sushi domain containing 5. (629 aa)
C2Complement C2a fragment; Component C2 which is part of the classical pathway of the complement system is cleaved by activated factor C1 into two fragments: C2b and C2a. C2a, a serine protease, then combines with complement factor C4b to generate the C3 or C5 convertase; Belongs to the peptidase S1 family. (752 aa)
CSMD3CUB and sushi domain-containing protein 3; Involved in dendrite development. (3707 aa)
MASP1Mannan binding lectin serine peptidase 1. (728 aa)
C1RLComplement C1r subcomponent-like protein; Mediates the proteolytic cleavage of HP/haptoglobin in the endoplasmic reticulum; Belongs to the peptidase S1 family. (487 aa)
VCANVersican core protein; May play a role in intercellular signaling and in connecting cells with the extracellular matrix. May take part in the regulation of cell motility, growth and differentiation. Binds hyaluronic acid. (3396 aa)
SELPP-selectin; Ca(2+)-dependent receptor for myeloid cells that binds to carbohydrates on neutrophils and monocytes. Mediates the interaction of activated endothelial cells or platelets with leukocytes. The ligand recognized is sialyl-Lewis X. Mediates rapid rolling of leukocyte rolling over vascular surfaces during the initial steps in inflammation through interaction with SELPLG; Belongs to the selectin/LECAM family. (830 aa)
C6Complement component C6; Constituent of the membrane attack complex (MAC) that plays a key role in the innate and adaptive immune response by forming pores in the plasma membrane of target cells. (934 aa)
CFHR5Complement factor H-related protein 5; Involved in complement regulation. The dimerized forms have avidity for tissue-bound complement fragments and efficiently compete with the physiological complement inhibitor CFH. (569 aa)
NCANNeurocan core protein; May modulate neuronal adhesion and neurite growth during development by binding to neural cell adhesion molecules (NG-CAM and N- CAM). Chondroitin sulfate proteoglycan; binds to hyaluronic acid; Belongs to the aggrecan/versican proteoglycan family. (1321 aa)
SEZ6LSeizure 6-like protein; May contribute to specialized endoplasmic reticulum functions in neurons. (1024 aa)
C4BPBC4b-binding protein beta chain; Controls the classical pathway of complement activation. It binds as a cofactor to C3b/C4b inactivator (C3bINA), which then hydrolyzes the complement fragment C4b. It also accelerates the degradation of the C4bC2a complex (C3 convertase) by dissociating the complement fragment C2a. It also interacts with anticoagulant protein S and with serum amyloid P component. The beta chain binds protein S. (252 aa)
APOHBeta-2-glycoprotein 1; Binds to various kinds of negatively charged substances such as heparin, phospholipids, and dextran sulfate. May prevent activation of the intrinsic blood coagulation cascade by binding to phospholipids on the surface of damaged cells. (345 aa)
CFHR3Complement factor H-related protein 3; Might be involved in complement regulation. (330 aa)
CFHR4Complement factor H-related protein 4; Involved in complement regulation. Can associate with lipoproteins and may play a role in lipid metabolism. (577 aa)
CFHR2Complement factor H-related protein 2; Involved in complement regulation. The dimerized forms have avidity for tissue-bound complement fragments and efficiently compete with the physiological complement inhibitor CFH. Can associate with lipoproteins and may play a role in lipid metabolism. (270 aa)
F13BCoagulation factor XIII B chain; The B chain of factor XIII is not catalytically active, but is thought to stabilize the A subunits and regulate the rate of transglutaminase formation by thrombin. (661 aa)
C4BPAC4b-binding protein alpha chain; Controls the classical pathway of complement activation. It binds as a cofactor to C3b/C4b inactivator (C3bINA), which then hydrolyzes the complement fragment C4b. It also accelerates the degradation of the C4bC2a complex (C3 convertase) by dissociating the complement fragment C2a. Alpha chain binds C4b. It interacts also with anticoagulant protein S and with serum amyloid P component. (597 aa)
CR2Complement receptor type 2; Receptor for complement C3, for the Epstein-Barr virus on human B-cells and T-cells and for HNRNPU. Participates in B lymphocytes activation. (1092 aa)
SELLL-selectin; Calcium-dependent lectin that mediates cell adhesion by binding to glycoproteins on neighboring cells. Mediates the adherence of lymphocytes to endothelial cells of high endothelial venules in peripheral lymph nodes. Promotes initial tethering and rolling of leukocytes in endothelia. Belongs to the selectin/LECAM family. (385 aa)
CSMD1CUB and sushi domain-containing protein 1; Potential suppressor of squamous cell carcinomas. (3564 aa)
PAMR1Inactive serine protease PAMR1; May play a role in regeneration of skeletal muscle. Belongs to the peptidase S1 family. (737 aa)
SEZ6L2Seizure 6-like protein 2; May contribute to specialized endoplasmic reticulum functions in neurons; Belongs to the SEZ6 family. (923 aa)
C1RComplement C1r subcomponent heavy chain; C1r B chain is a serine protease that combines with C1q and C1s to form C1, the first component of the classical pathway of the complement system; Belongs to the peptidase S1 family. (719 aa)
HPRHaptoglobin-related protein; Primate-specific plasma protein associated with apolipoprotein L-I (apoL-I)-containing high-density lipoprotein (HDL). This HDL particle, termed trypanosome lytic factor-1 (TLF-1), mediates human innate immune protection against many species of African trypanosomes. Binds hemoglobin with high affinity and may contribute to the clearance of cell-free hemoglobin to allow hepatic recycling of heme iron. (348 aa)
CR1LComplement component receptor 1-like protein; Complement C3b/C4b receptor 1 like; Belongs to the receptors of complement activation (RCA) family. (569 aa)
CFBComplement factor B Ba fragment; Factor B which is part of the alternate pathway of the complement system is cleaved by factor D into 2 fragments: Ba and Bb. Bb, a serine protease, then combines with complement factor 3b to generate the C3 or C5 convertase. It has also been implicated in proliferation and differentiation of preactivated B-lymphocytes, rapid spreading of peripheral blood monocytes, stimulation of lymphocyte blastogenesis and lysis of erythrocytes. Ba inhibits the proliferation of preactivated B-lymphocytes. (764 aa)
B4E1Z4_HUMANcDNA FLJ55673, highly similar to Complement factor B; Belongs to the peptidase S1 family. (1266 aa)
ACANAggrecan core protein 2; This proteoglycan is a major component of extracellular matrix of cartilagenous tissues. A major function of this protein is to resist compression in cartilage. It binds avidly to hyaluronic acid via an N-terminal globular region. (2530 aa)
C1SComplement C1s subcomponent heavy chain; C1s B chain is a serine protease that combines with C1q and C1r to form C1, the first component of the classical pathway of the complement system. C1r activates C1s so that it can, in turn, activate C2 and C4. (688 aa)
MASP2Mannan-binding lectin serine protease 2 A chain; Serum protease that plays an important role in the activation of the complement system via mannose-binding lectin. After activation by auto-catalytic cleavage it cleaves C2 and C4, leading to their activation and to the formation of C3 convertase. (686 aa)
IL15RASoluble interleukin-15 receptor subunit alpha; High-affinity receptor for interleukin-15. Can signal both in cis and trans where IL15R from one subset of cells presents IL15 to neighboring IL2RG-expressing cells (By similarity). In neutrophils, binds and activates kinase SYK in response to IL15 stimulation. In neutrophils, required for IL15- induced phagocytosis in a SYK-dependent manner. Expression of different isoforms may alter or interfere with signal transduction. [Isoform 6]: Does not bind IL15. [Isoform 8]: Does not bind IL15. (353 aa)
IL2RAInterleukin-2 receptor subunit alpha; Receptor for interleukin-2. The receptor is involved in the regulation of immune tolerance by controlling regulatory T cells (TREGs) activity. TREGs suppress the activation and expansion of autoreactive T-cells. (272 aa)
SRPXSushi repeat-containing protein SRPX; May be involved in phagocytosis during disk shedding, cell adhesion to cells other than the pigment epithelium or signal transduction. (464 aa)
GABBR1Gamma-aminobutyric acid type B receptor subunit 1; Component of a heterodimeric G-protein coupled receptor for GABA, formed by GABBR1 and GABBR2. Within the heterodimeric GABA receptor, only GABBR1 seems to bind agonists, while GABBR2 mediates coupling to G proteins. Ligand binding causes a conformation change that triggers signaling via guanine nucleotide-binding proteins (G proteins) and modulates the activity of down-stream effectors, such as adenylate cyclase. Signaling inhibits adenylate cyclase, stimulates phospholipase A2, activates potassium channels, inactivates voltage-depend [...] (961 aa)
SUSD3Sushi domain-containing protein 3; May play a role in breast tumorigenesis by promoting estrogen-dependent cell proliferation, cell-cell interactions and migration. (255 aa)
SVEP1Sushi, von Willebrand factor type A, EGF and pentraxin domain-containing protein 1; May play a role in the cell attachment process. (3571 aa)
SUSD1Sushi domain containing 1. (757 aa)
CSMD2CUB and Sushi multiple domains 2. (3631 aa)
SRPX2Sushi repeat-containing protein SRPX2; Acts as a ligand for the urokinase plasminogen activator surface receptor. Plays a role in angiogenesis by inducing endothelial cell migration and the formation of vascular network (cords). Involved in cellular migration and adhesion. Increases the phosphorylation levels of FAK. Interacts with and increases the mitogenic activity of HGF. Promotes synapse formation. May have a role in the perisylvian region, critical for language and cognitive development. (465 aa)
PAPPA2Pappalysin-2; Metalloproteinase which specifically cleaves insulin-like growth factor binding protein (IGFBP)-5 at the '163-Ser-|-Lys-164' bond. Shows limited proteolysis toward IGFBP-3. Belongs to the peptidase M43B family. (1791 aa)
CFHComplement factor H; Glycoprotein that plays an essential role in maintaining a well-balanced immune response by modulating complement activation. Acts as a soluble inhibitor of complement, where its binding to self markers such as glycan structures prevents complement activation and amplification on cell surfaces. Accelerates the decay of the complement alternative pathway (AP) C3 convertase C3bBb, thus preventing local formation of more C3b, the central player of the complement amplification loop. As a cofactor of the serine protease factor I, CFH also regulates proteolytic degradati [...] (1231 aa)
Your Current Organism:
Homo sapiens
NCBI taxonomy Id: 9606
Other names: H. sapiens, human, man
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