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    • https://espanol.libretexts.org/Quimica/Libro%3A_Qu%C3%ADmica_Org%C3%A1nica_con_%C3%A9nfasis_Biol%C3%B3gico_(Soderberg)/13%3A_Reacciones_con_intermediados_de_carbaniones_estabilizados_I/13.6%3A_Reacciones_de_carboxilaci%C3%B3n_y_decarboxilaci%C3%B3n
      In a decarboxylation step, it is the organic part of the molecule that is, in fact, the leaving group, 'pushed off' by the electrons on the carboxylate. When a pyruvate molecule binds, rearrangement o...In a decarboxylation step, it is the organic part of the molecule that is, in fact, the leaving group, 'pushed off' by the electrons on the carboxylate. When a pyruvate molecule binds, rearrangement of the active site architecture causes the previous step to go in reverse (step 5), freeing the CO 2 and generating a biotin base to deprotonate the alpha-carbon of pyruvate so that it can condense, in an aldol-like fashion, with CO 2 to form oxaloacetate (steps 6-7).

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