Our aim of the current project is to develop an efficient method to depolymerize natural kelps available in the Hokkaido ocean by a combination of several enzyme functions, including laminarin-degrading enzymes and alginate-degrading enzymes. A set of kelp spp. were obtained and ready to analytically evaluate their chemical compositions for the next fiscal year. Regarding a laminarin-degrading enzyme, we had picked up a glycoside hydrolase 55 enzyme (GH55) from a highly cellulolytic insect symbiont bacterium (Bianchetti and Takasuka et al., 2015, Journal of Biological Chemistry). 7 polysaccharide lyases 18 enzymes (PL18s), which function in alginate degradation, were selected from 7 different bacterial species, and four PL18s had been recombinantly expressed and subjected to the initial enzyme screening by using pure alginic acid substrate. Moreover, two polysaccharide lyase 17 enzymes (PL17s), were gene synthesized and cloned into the bacterial expression vector. From the previous studies, PL18 is shown to be the endo-type polysaccharide lyase, which produces oligoalginic acids (>3 degrees of polymerization (DP)), while PL17 should catalyze an exo-type reaction. In the FY2021, collected kelps will be tested to be hydrolyzed by at least three different enzymes, GH55, PL17, and PL18, and end products will be analyzed.