553 ALGE4_AZOVI Poly(beta-D-mannuronate) C5 epimerase 4 algE4 Converts beta-D-mannuronic acid (M) to alpha-L-guluronic acid (G), but introduces almost exclusively MG blocks, producing a polymer with non-gel-forming capacity. MDYNVKDFGALGDGVSDDRASIQAAIDAAYAAGGGTVYLPAGEYRVSAAGEPGDGCLMLKDGVYLAGAGMGETVIKLIDGSDQKITGMVRSAYGEETSNFGMRDLTLDGNRDNTSGKVDGWFNGYIPGGDGADRDVTIERVEVREMSGYGFDPHEQTINLTIRDSVAHDNGLDGFVADYLVDSVFENNVAYANDRHGFNVVTSTHDFVMTNNVAYGNGSSGLVVQRGLEDLALPSNILIDGGAYYDNAREGVLLKMTSDITLQNADIHGNGSSGVRVYGAQDVQILDNQIHDNAQAAAVPEVLLQSFDDTAGASGTYYTTLNTRIEGNTISGSANSTYGIQERNDGTDYSSLIDNDIAGVQQPIQLYGPHSTVSGEPGATPQQPSTGSDGEPLVGGDTDDQLQGGSGADRLDGGAGDDILDGGAGRDRLSGGAGADTFVFSAREDSYRTDTAVFNDLILDFEASEDRIDLSALGFSGLGDGYGGTLLLKTNAEGTRTYLKSFEADAEGRRFEVALDGDHTGDLSAANVVFAATGTTTELEVLGDSGTQAGAIV Mannuronan epimerase 4