most conspicuously , the resulting distance of only 2.71 +/- 0.03 a between the mn2+ ion of the enzyme and the 13c atom of hco3- in the enzyme-bicarbonate complex indicates that the bicarbonate is bound to the metal ion by two of its oxygen atoms in the central catalytic step , thereby supporting the modified zn ( ii ) -oh mechanism [ lindskog , s. , engberg , p. , forsman , c. , ibrahim , s. a. , jonsson , b.-h. , simonsson , i. , & tibell , l. ( 1984 ) ann . n.y. acad . sci . 429 , 61-75 ( and references cited therein ) ] .
C0014442
enzyme
C0026741
enzyme