Published online by Cambridge University Press: 14 April 2009
Esterase-27A (ES-27A) was characterized in strain A/WySnA by a cascade of seven bands seen after disc electrophoresis of serum and subsequent staining for esterase. ES-27A catalyses the hydrolysis of thiocholine butyrate and is strongly inhibited by 100 μm tetraisopropyl pyrophosphamide (isoOMPA). Hence, the enzyme was concluded to be a cholinesterase EC 3.1.1.8. A heat-labile form termed ES-27B was represented by strain AKR/Han. From a three-point cross (AKR/Han, A/Wy) and a five-point cross (AKR/Han, SEG/1), the gene order on chromosome 3 was concluded to be centromere–Car-2–Es-26–Es-27–Amy-1–Adh-1.
This work was supported by the Deutsche Forschungs-gemeinschaft (De 315/2). This is Communication no. 68 of a research programme devoted to the cellular distribution, regulation and genetics of non-specific esterases.