Enzymes
| UniProtKB help_outline | 5 proteins |
Reaction participants Show >> << Hide
- Name help_outline a ganglioside GM2 Identifier CHEBI:79218 Charge -1 Formula C35H56N3O26R2 SMILEShelp_outline CC(=O)N[C@@H]1[C@@H](O)C[C@@](O[C@@H]2[C@@H](O)[C@H](O[C@H]3[C@H](O)[C@@H](O)[C@H](OC[C@H](NC([*])=O)[C@H](O)[*])O[C@@H]3CO)O[C@H](CO)[C@@H]2O[C@@H]2O[C@H](CO)[C@H](O)[C@H](O)[C@H]2NC(C)=O)(O[C@H]1[C@H](O)[C@H](O)CO)C([O-])=O 2D coordinates Mol file for the small molecule Search links Involved in 23 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline H2O Identifier CHEBI:15377 (Beilstein: 3587155; CAS: 7732-18-5) help_outline Charge 0 Formula H2O InChIKeyhelp_outline XLYOFNOQVPJJNP-UHFFFAOYSA-N SMILEShelp_outline [H]O[H] 2D coordinates Mol file for the small molecule Search links Involved in 6,048 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline a ganglioside GA2 Identifier CHEBI:90085 Charge 0 Formula C24H40N2O18R2 SMILEShelp_outline O[C@H]1[C@H]([C@H](O[C@H]([C@@H]1O)O[C@@H]2[C@H](O[C@@H](OC[C@@H]([C@@H](*)O)NC(=O)*)[C@@H]([C@H]2O)O)CO)CO)O[C@H]3[C@@H]([C@H]([C@@H](O)[C@H](O3)CO)O)NC(C)=O 2D coordinates Mol file for the small molecule Search links Involved in 10 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline N-acetylneuraminate Identifier CHEBI:35418 Charge -1 Formula C11H18NO9 InChIKeyhelp_outline SQVRNKJHWKZAKO-LUWBGTNYSA-M SMILEShelp_outline [H][C@]1(OC(O)(C[C@H](O)[C@H]1NC(C)=O)C([O-])=O)[C@H](O)[C@H](O)CO 2D coordinates Mol file for the small molecule Search links Involved in 38 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:48172 | RHEA:48173 | RHEA:48174 | RHEA:48175 | |
|---|---|---|---|---|
| Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
| UniProtKB help_outline |
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Related reactions help_outline
Specific form(s) of this reaction
Publications
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Evidence for mitochondrial localization of a novel human sialidase (NEU4).
Yamaguchi K., Hata K., Koseki K., Shiozaki K., Akita H., Wada T., Moriya S., Miyagi T.
Based on the human cDNA sequence predicted to represent the NEU4 sialidase gene in public databases, a cDNA covering the entire coding sequence was isolated from human brain and expressed in mammalian cells. The cDNA encodes two isoforms: one possessing an N-terminal 12-amino-acid sequence that is ... >> More
Based on the human cDNA sequence predicted to represent the NEU4 sialidase gene in public databases, a cDNA covering the entire coding sequence was isolated from human brain and expressed in mammalian cells. The cDNA encodes two isoforms: one possessing an N-terminal 12-amino-acid sequence that is predicted to be a mitochondrial targeting sequence, and the other lacking these amino acids. Expression of the isoforms is tissue specific, as assessed by reverse transcription-PCR. Brain, muscle and kidney contained both isoforms; liver showed the highest expression, and the short form was predominant in this organ. In transiently transfected COS-1 cells, enzyme activity was markedly increased with gangliosides as well as with glycoproteins and oligosaccharides as substrates compared with the control levels. This differs from findings with other human sialidases. Although the isoforms were not distinguishable with regard to substrate specificity, they exhibited differential subcellular localizations. Immunofluorescence microscopy and biochemical fractionation demonstrated that an exogenously expressed haemagglutinin-tagged long form of NEU4 was concentrated in mitochondria in several human culture cell types, whereas the short form was present in intracellular membranes, indicating that the sequence comprising the N-terminal 12 amino acid residues acts as a targeting signal for mitochondria. Co-localization of the long form to mitochondria was further supported by efficient targeting of the N-terminal region fused to enhanced green fluorescent protein, and by the targeting failure of a mutant with an amino acid substitution in this region. NEU4 is possibly involved in regulation of apoptosis by modulation of ganglioside G(D3), which accumulates in mitochondria during apoptosis and is the best substrate for the sialidase. << Less
Biochem. J. 390:85-93(2005) [PubMed] [EuropePMC]
This publication is cited by 3 other entries.