The number of inorganic Sulphur (or sulphide) atoms present in the metalloprotein active sites ofrubredoxin, 2-iron ferredoxin and 4-iron ferredoxin, respectively, are
(a)0, 2 and 4
(b)2, 4 and 3
(c)0, 4 and 2
(d)0,2 and 3
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
Rubredoxin has a single Fe bound only by four cysteines (no inorganic S); 2Fe ferredoxin has an Fe₂S₂ core (2); 4Fe ferredoxin an Fe₄S₄ cubane (4).