Ju_2015_Int.J.Biol.Macromol_72_63

A novel type of hydrolase (LmH) from Listeria monocytogenes was identified, characterized, and immobilized for biotechnological applications. Primary sequence analysis indicated that LmH had a catalytic triad (Ser(91)-Asp(192)-His(222)) with a molecular weight of 27.8 kDa. Homologs of this enzyme are produced by many Gram-positive bacteria including Bacillus, Staphylococcus, and Enterococcus. Biochemical properties of LmH were investigated by performing mass spectrometry, dynamic light scattering (DLS), enzyme assays, enantioselective analysis, circular dichroism (CD) spectroscopy, fluorescence analysis, and macroscopic hydrogel formations. Interestingly, cross-linked enzyme aggregates (CLEAs) of LmH exhibited enhanced stability and good recycling abilities compared to free LmH. These molecular characteristics of LmH highlight its great potential for the pharmaceutical, biotechnological, and chemical industries.