Lipstatin
Chemical compound
From Wikipedia, the free encyclopedia
Lipstatin is a potent, irreversible inhibitor of pancreatic lipase. It is a natural product that was first isolated from the actinobacterium Streptomyces toxytricini.[1]
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| Names | |
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| Systematic IUPAC name
(2S,4Z,7Z)-1-[(2S,3S)-3-Hexyl-4-oxooxetan-2-yl]trideca-4,7-dien-2-yl (2S)-2-formamido-4-methylpentanoate | |
| Other names
(2S,4Z,7Z)-1-[(2S,3S)-3-Hexyl-4-oxo-2-oxetanyl]-4,7-tridecadien-2-yl N-formyl-L-leucinate | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.126.007 |
| MeSH | Lipstatin |
PubChem CID |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| C29H49NO5 | |
| Molar mass | 491.713 g·mol−1 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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The popular antiobesity drug orlistat (trade names Xenical and alli) is a saturated derivative of lipstatin.
Biosynthesis
Lipstatin is composed of a 2-hexyl-3,5-dihydroxy-7,10-hexadecadienoic-β-lactone 22 carbon backbone from fatty acid synthesis pathway and an N-formyl-L-leucine group ester linked to the 5-hydroxyl group of the back bone. The composts of the lipstatin are ultimately from linoleic acid, octanoic acid, and L-leucine.[2]
The 22 carbon β-lactone moiety is derived from Claisen condensation between 3-hydroxytetradeca-5,8-dienyl-CoA derived from linoleic acid and hexyl-malonyl-ACP derived from octanoic acid.[2][3][4]Linoleic acid is first attached to CoA through some acyl-CoA synthetase homologue synthesized by lipstatin biosynthetic operons (Lst) and goes through two β-oxidation to hydroxytetradeca-5,8-dienyl-CoA. 3’ hydroxyl group from solution H2O is added by enoyl reductase homologue followed by enoyl hydratase homologue.[5] Octanoic acid is also attached to CoA through similar acyl-CoA synthetase homologue (LstC) to form octanoyl-CoA. Octanoyl-CoA is 2’ carboxylated and loaded to acyl carrier protein (ACP) borrowed from primary metabolism to form hexyl-malonyl-ACP.[4]
The β-lactone ring is formed by reduction of 3-keto group by 3-hydroxysteroid dehydrogenase homologue followed by a spontaneously nucleophilic attack of the 3-hydroxyl group on the carbonyl of the ACP-tether acyl intermediate. This step follows the esterification of the N-formyl-L-leucine group.[2]
The N-formyl-L-leucine group is derived from L-leucine. L-leucine was activated by LstE forming thioester and its α-amine group is formylated by LstF. Finally, 5-hydroxyl of 22 carbon β-lactone backbone nucleophilic attacks on the acyl carbon of the formyl-leucine and forms the lipstatin.[2]