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IPR008139 is a Saposin B type domain.
<p>The saposin B-type domain is a ~80 amino acid domain present in saposins and related proteins that interact with lipids. The domain is named after the small lysosomal proteins, saposins, which serve as sphingolipid hydrolase activator proteins in vertebrates. The mammalian saposins are synthesized as a single precursor molecule (prosaposin) which contains two saposin A-type domains in the extremities that are removed in the activation reaction, and four saposin B-type domains yielding the active saposins A, B, C and D after proteolytic cleavage. Saposin-like proteins (SAPLIPs) can have different functions, such as enzymatic activities, as cofactors of enzymes involved in lipid metabolism, as components of lung surfactant reducing the surface tension, as part of a complex involved in stage regulation of Dictyostelium, as antimicrobial effector molecules, or as a stimulator of dendritic outgrowth [[cite:PUB00005721], [cite:PUB00005747], [cite:PUB00018079], [cite:PUB00018080]].</p> <p>The 3D structures of different SAPLIPs have been resolved, and show that the saposin B-type domain is formed by a four/five helical bundle. The saposin B-type domain is characterised by six conserved cysteine residues involved in three disulfide bridges: one between helices 2 and 3, one between the first and the last helix and one from the N-terminal part of the first helix to the C terminus. In plant aspartic proteinases the two subdomains that are connected by the disulfide bridges occur in inverse order, these are called "swaposin" domains [[cite:PUB00005742], [cite:PUB00005765], [cite:PUB00014083]]. In these phytepsin proteins the two half saposin B-type domains occur in combination with the aspartyl protease signature [[cite:PUB00018079], [cite:PUB00010538]].</p>
This description is obtained from EB-eye REST.
Transcript | Name | Description | Predicted domains | Domain count |
---|---|---|---|---|
– | PREDICTED: aspartic proteinase-like [Glycine max] gi|356555682|ref|XP_003546159.1| | 30 | ||
– | PREDICTED: aspartic proteinase oryzasin-1-like [Glycine max] gi|356556454|ref|XP_003546541.1| | 29 | ||
– | PREDICTED: aspartic proteinase oryzasin-1-like [Glycine max] gi|356556454|ref|XP_003546541.1| | 21 | ||
– | PREDICTED: aspartic proteinase-like [Cicer arietinum] gi|502117401|ref|XP_004495808.1| | 21 | ||
– | PREDICTED: aspartic proteinase oryzasin-1-like [Cicer arietinum] gi|502150663|ref|XP_004508063.1| | 28 | ||
– | Saposin B domain-containing protein [Medicago truncatula] gi|357506565|ref|XP_003623571.1| | 17 | ||
– | Aspartic proteinase 2 [Glycine max] gi|351725345|ref|NP_001237345.1| | 30 | ||
– | Aspartic protease isoform 2 [Theobroma cacao] gi|508701346|gb|EOX93242.1| | 30 | ||
– | PREDICTED: proactivator polypeptide-like 1-like isoform X1 [Cicer arietinum] gi|502146403|ref|XP_004506438.1| | 18 | ||
– | Aspartic proteinase [Vigna unguiculata] gi|20800441|gb|AAB03843.2| | 32 | ||
– | Saposin B domain protein; TAIR: AT3G51730.1 saposin B domain-containing protein; Swiss-Prot: sp|P07602|SAP_HUMAN Prosaposin; TrEMBL-Plants: tr|G7KX29|G7KX29_MEDTR Saposin B domain protein; Found in the gene: LotjaGi1g1v0454000 | 18 | ||
– | Aspartic proteinase; TAIR: AT1G11910.1 aspartic proteinase A1; Swiss-Prot: sp|P42211|ASPRX_ORYSJ Aspartic proteinase; TrEMBL-Plants: tr|A0A0B2SEY7|A0A0B2SEY7_GLYSO Aspartic proteinase; Found in the gene: LotjaGi1g1v0751400 | 30 | ||
– | Aspartic proteinase; TAIR: AT1G11910.1 aspartic proteinase A1; Swiss-Prot: sp|P42211|ASPRX_ORYSJ Aspartic proteinase; TrEMBL-Plants: tr|A0A0B2SEY7|A0A0B2SEY7_GLYSO Aspartic proteinase; Found in the gene: LotjaGi1g1v0751400 | 26 | ||
– | Aspartic proteinase; TAIR: AT1G11910.1 aspartic proteinase A1; Swiss-Prot: sp|P42211|ASPRX_ORYSJ Aspartic proteinase; TrEMBL-Plants: tr|A0A0B2SEY7|A0A0B2SEY7_GLYSO Aspartic proteinase; Found in the gene: LotjaGi1g1v0751400 | 30 | ||
– | AT4G29520-like protein; TAIR: AT4G29520.1 nucleophosmin; Swiss-Prot: sp|Q9LVT4|DRL37_ARATH Probable disease resistance protein At5g47250; TrEMBL-Plants: tr|I1J4C8|I1J4C8_SOYBN Uncharacterized protein; Found in the gene: LotjaGi2g1v0231100 | 12 | ||
– | Aspartic proteinase; TAIR: AT1G11910.1 aspartic proteinase A1; Swiss-Prot: sp|Q42456|ASPR1_ORYSJ Aspartic proteinase oryzasin-1; TrEMBL-Plants: tr|A0A072V2S8|A0A072V2S8_MEDTR Fungal proteinase A, aspartic proteinase superfamily protein; Found in the gene: LotjaGi3g1v0050500 | 27 | ||
– | Aspartic proteinase; TAIR: AT1G11910.1 aspartic proteinase A1; Swiss-Prot: sp|Q42456|ASPR1_ORYSJ Aspartic proteinase oryzasin-1; TrEMBL-Plants: tr|A0A072V2S8|A0A072V2S8_MEDTR Fungal proteinase A, aspartic proteinase superfamily protein; Found in the gene: LotjaGi3g1v0050500 | 27 | ||
– | Saposin B domain protein; TAIR: AT3G51730.1 saposin B domain-containing protein; Swiss-Prot: sp|P07602|SAP_HUMAN Prosaposin; TrEMBL-Plants: tr|I3TAH9|I3TAH9_LOTJA Uncharacterized protein; Found in the gene: LotjaGi3g1v0094300 | 21 | ||
– | Saposin B domain protein; TAIR: AT3G51730.1 saposin B domain-containing protein; Swiss-Prot: sp|P07602|SAP_HUMAN Prosaposin; TrEMBL-Plants: tr|I3TAH9|I3TAH9_LOTJA Uncharacterized protein; Found in the gene: LotjaGi3g1v0094300 | 21 | ||
– | Saposin B domain protein; TAIR: AT3G51730.1 saposin B domain-containing protein; Swiss-Prot: sp|P07602|SAP_HUMAN Prosaposin; TrEMBL-Plants: tr|I3TAH9|I3TAH9_LOTJA Uncharacterized protein; Found in the gene: LotjaGi3g1v0094300 | 21 | ||
– | Aspartic proteinase; TAIR: AT1G11910.1 aspartic proteinase A1; Swiss-Prot: sp|O65390|APA1_ARATH Aspartic proteinase A1; TrEMBL-Plants: tr|A0A151RMJ6|A0A151RMJ6_CAJCA Aspartic proteinase oryzasin-1; Found in the gene: LotjaGi3g1v0187200 | 30 | ||
– | Aspartic proteinase; TAIR: AT1G62290.1 Saposin-like aspartyl protease family protein; Swiss-Prot: sp|Q8VYL3|APA2_ARATH Aspartic proteinase A2; TrEMBL-Plants: tr|A0A151SU18|A0A151SU18_CAJCA Aspartic proteinase; Found in the gene: LotjaGi4g1v0012200 | 31 | ||
– | Aspartic proteinase; TAIR: AT1G62290.1 Saposin-like aspartyl protease family protein; Swiss-Prot: sp|Q8VYL3|APA2_ARATH Aspartic proteinase A2; TrEMBL-Plants: tr|A0A151SU18|A0A151SU18_CAJCA Aspartic proteinase; Found in the gene: LotjaGi4g1v0012200 | 31 | ||
– | Aspartic proteinase; TAIR: AT1G11910.1 aspartic proteinase A1; Swiss-Prot: sp|P42211|ASPRX_ORYSJ Aspartic proteinase; TrEMBL-Plants: tr|A0A072VYH6|A0A072VYH6_MEDTR Fungal proteinase A, aspartic proteinase superfamily protein; Found in the gene: LotjaGi5g1v0233800 | 29 | ||
– | Aspartic proteinase; TAIR: AT1G11910.1 aspartic proteinase A1; Swiss-Prot: sp|P42211|ASPRX_ORYSJ Aspartic proteinase; TrEMBL-Plants: tr|A0A072VYH6|A0A072VYH6_MEDTR Fungal proteinase A, aspartic proteinase superfamily protein; Found in the gene: LotjaGi5g1v0233800 | 31 | ||
– | Aspartic proteinase; TAIR: AT1G11910.1 aspartic proteinase A1; Swiss-Prot: sp|P42211|ASPRX_ORYSJ Aspartic proteinase; TrEMBL-Plants: tr|A0A072VYH6|A0A072VYH6_MEDTR Fungal proteinase A, aspartic proteinase superfamily protein; Found in the gene: LotjaGi5g1v0233800 | 31 | ||
– | Aspartic proteinase; TAIR: AT1G62290.1 Saposin-like aspartyl protease family protein; Swiss-Prot: sp|P42211|ASPRX_ORYSJ Aspartic proteinase; TrEMBL-Plants: tr|V7AY39|V7AY39_PHAVU Uncharacterized protein; Found in the gene: LotjaGi6g1v0217600 | 21 | ||
– | Aspartic proteinase; TAIR: AT1G62290.1 Saposin-like aspartyl protease family protein; Swiss-Prot: sp|Q42456|ASPR1_ORYSJ Aspartic proteinase oryzasin-1; TrEMBL-Plants: tr|V7AY39|V7AY39_PHAVU Uncharacterized protein; Found in the gene: LotjaGi6g1v0217600 | 29 | ||
– | Aspartic proteinase; TAIR: AT1G11910.1 aspartic proteinase A1; Swiss-Prot: sp|O65390|APA1_ARATH Aspartic proteinase A1; TrEMBL-Plants: tr|I1MFJ1|I1MFJ1_SOYBN Uncharacterized protein; Found in the gene: LotjaGi6g1v0292400 | 31 |
A list of co-occurring predicted domains within the L. japonicus gene space:
Predicted domain | Source | Observations | Saturation (%) |
---|---|---|---|
cd06098 | CDD | 1 | 3.45 |