title: The chemistry of marine pulmonate gastropods.
abstract: Secondary metabolites from pulmonate molluscs of the genera Siphonaria, Onchidium, and Trimusculus are described. Siphonaria and Onchidium biosynthesize mostly propionate-based metabolites whereas Trimusculus yields diterpene derivatives with a single type of labdane skeleton. The 42 regular polypropionates reported to date from Siphonaria are divided into two classes (class I, class II), based on their observed structural and stereochemical analogy. The strong resemblance between class I and cephalaspidean metabolites and between class II and onchidiid metabolites as well as the structural features of Trimusculus, in relation to the other pulmonates, encourage speculation about their biosynthetic and phylogenetic relationship. Class I metabolites could be suitable material to evidence that type I PKS modules are perhaps used iteratively in their biosynthesis.
authors.affiliation: Instituto de Productos Naturales y Agrobiología del CSIC, Avda Astrofísico F. Sánchez 3 Apdo 195, 38206 La Laguna, Tenerife, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Darias
authors.forename: M
authors.initials: M
authors.lastname: Cueto
authors.forename: A R
authors.initials: AR
authors.lastname: Díaz-Marrero
mesh_terms: D000818:Animals; D049851:Gastropoda / Q000737:chemistry*; D008386:Marine Biology; D011422:Propionates / Q000737:chemistry*; D013045:Species Specificity; D013329:Structure-Activity Relationship
chemical_list: D011422:Propionates