Entry M0004 22.214.171.124 nitrite reductase (NO-forming)
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Cu502 donates the electron to the bound nitrous acid, which collapses to form water, deprotonating His255B, and a Cu-bound NO radical.
It is unknown whether this reaction is reversible or not.
Comment: Water displaces the product C00533 after this step. An alternative role for His255 in this step may be to provide a positive charge in a location that assists in stabilising the transient complex of NO and water bound to the copper .
Amino acids involved in the reaction step.
Metal Cofactors involved in Step 02
||Bonds Changed in Order
||Atom Types Involved
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