Abstract
The capability of Cerrena unicolor to produce fruiting bodies and lectins was studied in solid-state fermentation of a sorghum and wheat straw mixture. The first primordia appeared on day 48 and reached 6-10 mm; however, no formation of fruiting bodies occurred and these rudiments were harvested on day 55. The protein content in the rudiment extracts was significantly higher, whereas the specific hemagglutinating activity (HA) was sixfold lower as compared with those in extracts from mycelial biomass. Moreover, the specific HA of the 80-day mycelium increased to 16,667 U/mg, exceeding by sixfold that of 55-day-old mycelium. Four protein fractions (160, 105, 67, and 8 kDa) were detected by gel-chromatography of mycelial biomass crude extract; the highest specific HA was revealed in fraction III (26336 U HA/mg). Among sugars tested, galactose was the most potent inhibitor of HA of all protein fractions, with minimal inhibition concentrations of 0.095-0.780 mM. The galactose-specific lectins isolated from the fractions II and III by affinity chromatography ranged from 15 to 116 kDa and differed with kinetic parameters.
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