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Chemical compound
Lipstatin is a potent, irreversible inhibitor of pancreatic lipase. It is a natural product that was first isolated from the actinobacterium "Streptomyces toxytricini".
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.
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. 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. 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.
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.
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.
References.
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