1H, 13C and 15N resonance assignments of wild-type Bacillus subtilis Lipase A and its mutant evolved towards thermostability

Abstract

Previously, we evolved Lipase A from Bacillus subtilis towards increased thermostability. The resulting mutant retains significant catalytic activity upon heating above 60 C (and up to 100 C) and cooling down, whereas wild-type lipase precipitates irreversibly and does not show significant activity in these conditions. Kinetic thermostability of proteins has not been characterized well on the molecular structure level so far, therefore our aim is to study it using NMR spectroscopy. Here, nearly complete 1H, 13C and 15N resonance assignments are reported for wild-type and mutant Lipase A. Chemical shifts were used to predict secondary structure elements of both Lipase A variants.