ID 1.1.1.131 DE mannuronate reductase. AN mannonate dehydrogenase. CA (1) D-mannonate + NAD(+) = D-mannuronate + H(+) + NADH. CA (2) D-mannonate + NADP(+) = D-mannuronate + H(+) + NADPH. CC -!- Formerly EC 1.1.1.180 and EC 1.2.1.34. //