H2-forming N5,N10-methylenetetrahydromethanopterin dehydrogenase catalyzes the reversible dehydrogenation of N5,N10-methylenetetrahydromethanopterin (CH2 = H4MPT) to N5,N10-methenyltetrahydromethanopterin (CH = H4MPT+) and H2. In D2O both HD and D2 are formed from CH2 = H4MPT and in H2O both HD and H2 from CD2 = H4MPT. Evidence is presented that HD is not an intermediate in the formation of D2 and H2, respectively.
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Klein et al. (1995) studied this question.
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