5nxb: Difference between revisions
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==Mouse galactocerebrosidase in complex with saposin A== | |||
<StructureSection load='5nxb' size='340' side='right' caption='[[5nxb]], [[Resolution|resolution]] 3.60Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[5nxb]] is a 4 chain structure. This structure supersedes the now removed PDB entry [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=5n8k 5n8k]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5NXB OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5NXB FirstGlance]. <br> | |||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=BMA:BETA-D-MANNOSE'>BMA</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene></td></tr> | |||
[[Category: | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Galactosylceramidase Galactosylceramidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.46 3.2.1.46] </span></td></tr> | ||
[[Category: Deane, J | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5nxb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5nxb OCA], [http://pdbe.org/5nxb PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5nxb RCSB], [http://www.ebi.ac.uk/pdbsum/5nxb PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5nxb ProSAT]</span></td></tr> | ||
[[Category: Hill, C | </table> | ||
[[Category: | == Disease == | ||
[[http://www.uniprot.org/uniprot/GALC_MOUSE GALC_MOUSE]] Defects in Galc are the cause of the 'twitcher' phenotype; an autosomal recessive leukodystrophy similar to the human disease (Krabbe disease). This deficiency results in the insufficient catabolism of several galactolipids that are important in the production of normal myelin. | |||
== Function == | |||
[[http://www.uniprot.org/uniprot/GALC_MOUSE GALC_MOUSE]] Hydrolyzes the galactose ester bonds of galactosylceramide, galactosylsphingosine, lactosylceramide, and monogalactosyldiglyceride. Enzyme with very low activity responsible for the lysosomal catabolism of galactosylceramide, a major lipid in myelin, kidney and epithelial cells of small intestine and colon.<ref>PMID:8769874</ref> [[http://www.uniprot.org/uniprot/SAP_MOUSE SAP_MOUSE]] Prosaposin: Behaves as a myelinotrophic and neurotrophic factor, these effects are mediated by its G-protein-coupled receptors, GPR37 and GPR37L1, undergoing ligand-mediated internalization followed by ERK phosphorylation signaling.<ref>PMID:23690594</ref> Saposin-A and saposin-C stimulate the hydrolysis of glucosylceramide by beta-glucosylceramidase (EC 3.2.1.45) and galactosylceramide by beta-galactosylceramidase (EC 3.2.1.46). Saposin-C apparently acts by combining with the enzyme and acidic lipid to form an activated complex, rather than by solubilizing the substrate.[UniProtKB:P07602] Saposin-B stimulates the hydrolysis of galacto-cerebroside sulfate by arylsulfatase A (EC 3.1.6.8), GM1 gangliosides by beta-galactosidase (EC 3.2.1.23) and globotriaosylceramide by alpha-galactosidase A (EC 3.2.1.22). Saposin-B forms a solubilizing complex with the substrates of the sphingolipid hydrolases.[UniProtKB:P07602] Saposin-D is a specific sphingomyelin phosphodiesterase activator (EC 3.1.4.12).[UniProtKB:P07602] Saposins are specific low-molecular mass non-enzymic proteins, they participate in the lysosomal degradation of sphingolipids, which takes place by the sequential action of specific hydrolases.[UniProtKB:P07602] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Galactosylceramidase]] | |||
[[Category: Deane, J E]] | |||
[[Category: Graham, S C]] | |||
[[Category: Hill, C H]] | |||
[[Category: Galactocerebroside]] | |||
[[Category: Galactosylceramide]] | |||
[[Category: Galc]] | |||
[[Category: Hydrolase]] | |||
[[Category: Krabbe disease]] | |||
[[Category: Sapa]] | |||
