Zymolectin Interaction Theory
The accepted mechanism of flocculation involves a protein-carbohydrate model (Miki et al., 1982) (figure 1.3). Fully flocculent yeast cells exhibit carbohydrate α-mannan receptors and protein zymolectins (section 1.5.4). Zymolectins are so termed as they may not be true bivalent lectins (Speers, Smart, Stewart and Jin,1998) It has been suggested that zymolectin interactions between the protein and mannan moities results in the flocculation phenotype (section 4.1) with Ca2+ ions required for the correct conformation of the flocculation lectins. Coflocculation between Kluyveromyces and Schizosaccharomyces has been shown to be by a “lectinic” mechanism (El-Behhari et al., 2000). This theory explains the essential role of calcium and how deproteinisation affects flocculation.
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