Score = 195 (73.7 bits), Expect = 6.8e-15, P = 6.8e-15
Identities = 40/106 (37%), Positives = 58/106 (54%)
Query: 3 IPQGSHVYPFSYTLPP-TIPSSFDGEHGRVRYKVTARLDRPWKFDKTTEAVFSVVTPYDL 61
IP G H YPFS+ LP T+ +SF+G+HG +RY V +L RPW K + F+V+ P D+
Sbjct: 99 IPAGRHEYPFSFQLPEETLVTSFEGKHGSIRYWVKVKLHRPWATVKKIKKEFTVIEPIDI 158
Query: 62 NTDMRAKEPINQNVSKNFRFLWRQSGPLTLSVSAPFSGFVPGQTIP 107
NT P K R +R G ++++ G+ PG+ IP
Sbjct: 159 NTPSLLA-PQAGTKDKMARIWYRNCGQVSITAKIDRKGYTPGEVIP 203
Score = 174 (66.3 bits), Expect = 1.4e-12, P = 1.4e-12
Identities = 40/105 (38%), Positives = 55/105 (52%)
Query: 3 IPQGSHVYPFSYTLPPT-IPSSFDGEHGRVRYKVTARLDRPWKFDKTTEAVFSVVTPYDL 61
I G H Y FS+ LP T + +SF+G+HG VRY V A L RPW T+ F+V D+
Sbjct: 105 IHSGRHEYAFSFELPQTPLATSFEGKHGSVRYWVKAELHRPWLLPMKTKKEFTVFEHIDI 164
Query: 62 NTDMRAKEPINQNVSKNFRFLWRQSGPLTLSVSAPFSGFVPGQTI 106
NT + P K + SGP++LS G+ PG++I
Sbjct: 165 NTPLLLS-PQAGTKEKTLCCWFCTSGPISLSAKIERKGYTPGESI 208
>PF00339 Arrestin_N: Arrestin (or S-antigen), N-terminal domain; InterPro: IPR011021 G protein-coupled receptors are a large family of signalling molecules that respond to a wide variety of extracellular stimuli
The receptors relay the information encoded by the ligand through the activation of heterotrimeric G proteins and intracellular effector molecules. To ensure the appropriate regulation of the signalling cascade, it is vital to properly inactivate the receptor. This inactivation is achieved, in part, by the binding of a soluble protein, arrestin, which uncouples the receptor from the downstream G protein after the receptors are phosphorylated by G protein-coupled receptor kinases. In addition to the inactivation of G protein-coupled receptors, arrestins have also been implicated in the endocytosis of receptors and cross talk with other signalling pathways. Arrestin (retinal S-antigen) is a major protein of the retinal rod outer segments. It interacts with photo-activated phosphorylated rhodopsin, inhibiting or 'arresting' its ability to interact with transducin []. The protein binds calcium, and shows similarity in its C terminus to alpha-transducin and other purine nucleotide-binding proteins. In mammals, arrestin is associated with autoimmune uveitis. Arrestins comprise a family of closely-related proteins that includes beta-arrestin-1 and -2, which regulate the function of beta-adrenergic receptors by binding to their phosphorylated forms, impairing their capacity to activate G(S) proteins; Cone photoreceptors C-arrestin (arrestin-X) [], which could bind to phosphorylated red/green opsins; and Drosophila phosrestins I and II, which undergo light-induced phosphorylation, and probably play a role in photoreceptor transduction [, , ]. The crystal structure of bovine retinal arrestin comprises two domains of antiparallel beta-sheets connected through a hinge region and one short alpha-helix on the back of the amino-terminal fold []. The binding region for phosphorylated light-activated rhodopsin is located at the N-terminal domain, as indicated by the docking of the photoreceptor to the three-dimensional structure of arrestin. The N-terminal domain consists of an immunoglobulin-like beta-sandwich structure. This entry represents proteins with immunoglobulin-like domains that are similar to those found in arrestin.; PDB: 1SUJ_A 3UGX_A 1CF1_B 1AYR_A 3UGU_A 3P2D_B 1ZSH_A 2WTR_B 3GC3_A 1G4R_A ....
>PF13002 LDB19: Arrestin_N terminal like; InterPro: IPR024391 This entry represents a predicted Ig-like beta sandwich domain found towards the N terminus of protein LDB19 []
It is also found in other sequences and is related to the arrestin N-terminal fold [].
>PF03643 Vps26: Vacuolar protein sorting-associated protein 26 ; InterPro: IPR005377 The movement of lipid and protein components between intracellular organelles requires the regulated interactions of many molecules
Vacuolar protein sorting-associated protein (Vps)5 is a yeast protein that is a subunit of a large multimeric complex, termed the retromer complex, involved in retrograde transport of proteins from endosomes to the trans-Golgi network. Sorting nexin (SNX) 1 and SNX2 are its mammalian orthologs []. To carry out its biological functions, Vps5 forms the retromer complex with at least four other proteins: Vps17, Vps26, Vps29, and Vps35 []. This family of Vps26-proteins also contains Down syndrome critical region 3/A.; GO: 0007034 vacuolar transport, 0030904 retromer complex; PDB: 3LHA_A 3LH9_A 2R51_A 3LH8_B 2FAU_A.
>PF08737 Rgp1: Rgp1; InterPro: IPR014848 Rgp1 forms heterodimer with Ric1 (IPR009771 from INTERPRO) which associates with Golgi membranes and functions as a guanyl-nucleotide exchange factor []
>PF07070 Spo0M: SpoOM protein; InterPro: IPR009776 This family consists of several bacterial SpoOM proteins which are thought to control sporulation in Bacillus subtilis
Spo0M exerts certain negative effects on sporulation and its gene expression is controlled by sigmaH [].
>PF02752 Arrestin_C: Arrestin (or S-antigen), C-terminal domain; InterPro: IPR011022 G protein-coupled receptors are a large family of signalling molecules that respond to a wide variety of extracellular stimuli
The receptors relay the information encoded by the ligand through the activation of heterotrimeric G proteins and intracellular effector molecules. To ensure the appropriate regulation of the signalling cascade, it is vital to properly inactivate the receptor. This inactivation is achieved, in part, by the binding of a soluble protein, arrestin, which uncouples the receptor from the downstream G protein after the receptors are phosphorylated by G protein-coupled receptor kinases. In addition to the inactivation of G protein-coupled receptors, arrestins have also been implicated in the endocytosis of receptors and cross talk with other signalling pathways. Arrestin (retinal S-antigen) is a major protein of the retinal rod outer segments. It interacts with photo-activated phosphorylated rhodopsin, inhibiting or 'arresting' its ability to interact with transducin []. The protein binds calcium, and shows similarity in its C terminus to alpha-transducin and other purine nucleotide-binding proteins. In mammals, arrestin is associated with autoimmune uveitis. Arrestins comprise a family of closely-related proteins that includes beta-arrestin-1 and -2, which regulate the function of beta-adrenergic receptors by binding to their phosphorylated forms, impairing their capacity to activate G(S) proteins; Cone photoreceptors C-arrestin (arrestin-X) [], which could bind to phosphorylated red/green opsins; and Drosophila phosrestins I and II, which undergo light-induced phosphorylation, and probably play a role in photoreceptor transduction [, , ]. The crystal structure of bovine retinal arrestin comprises two domains of antiparallel beta-sheets connected through a hinge region and one short alpha-helix on the back of the amino-terminal fold []. The binding region for phosphorylated light-activated rhodopsin is located at the N-terminal domain, as indicated by the docking of the photoreceptor to the three-dimensional structure of arrestin. The C-terminal domain consists of an immunoglobulin-like beta-sandwich structure. This entry represents proteins with immunoglobulin-like domains that are similar to those found in arrestin.; PDB: 1SUJ_A 3UGX_A 1CF1_B 1AYR_A 3UGU_A 3P2D_B 1ZSH_A 2WTR_B 3GC3_A 1G4R_A ....
>cd00917 PG-PI_TP The phosphatidylinositol/phosphatidylglycerol transfer protein (PG/PI-TP) has been shown to bind phosphatidylglycerol and phosphatidylinositol, but the biological significance of this is still obscure
Bul1 binds the ubiquitin ligase Rsp5, via an N-terminal PPSY motif (157-160 in P48524 from SWISSPROT) []. The complex containing Bul1 and Rsp5 is involved in intracellular trafficking of the general amino acid permease Gap1 [], degradation of Rog1 in cooperation with Bul2 and GSK-3 [], and mitochondrial inheritance []. Bul1 may contain HEAT repeats. The C terminus is IPR007520 from INTERPRO.
>PF02221 E1_DerP2_DerF2: ML domain; InterPro: IPR003172 The MD-2-related lipid-recognition (ML) domain is implicated in lipid recognition, particularly in the recognition of pathogen related products
It has an immunoglobulin-like beta-sandwich fold similar to that of E-set Ig domains. This domain is present in the following proteins: Epididymal secretory protein E1 (also known as Niemann-Pick C2 protein), which is known to bind cholesterol. Niemann-Pick disease type C2 is a fatal hereditary disease characterised by accumulation of low-density lipoprotein-derived cholesterol in lysosomes []. House-dust mite allergen proteins such as Der f 2 from Dermatophagoides farinae and Der p 2 from Dermatophagoides pteronyssinus []. ; PDB: 2AG9_B 1G13_B 2AG2_B 2AG4_A 1TJJ_C 1PU5_C 1PUB_A 2AF9_A 3T6Q_D 3M7O_B ....
