Figure 6. Illustration of the preferential enzyme attack by AlgE1 or AlgE6 of interspersed MM-sequences in polyMG (FG=0.47) and the following degradation products produced after treatment with M-lyase from H. tuberculata.
(A, B) Most probable epimerization patterns achieving homogeneous G-blocks with an odd number of uronic acid residues (including the 4-deoxy-L-erythro-hex-4-enepyranosyl uronate residue), in addition to ΔG-M-G and Δ-G as main degradation products after lyase treatment of low epimerized polyMG-alginates. (C) Heterogeneous blocks with an odd number of residues, or shorter homogeneous G-blocks but with an even number of residues produced upon lyase degradation of epimerized material.