A fourth mannose is added to the N-glycan precursor by ALG11. The addition of the fifth mannose, also by ALG11, is the last step occurring on the cytosolic side of the ER membrane (Cipollo JF et al, 2001). Both these reactions are alpha1,2 mannose additions.
Trimble, RB, Chi, JH, Dean, N, Yan, Q, Cipollo, JF
alpha-1,2-mannosyltransferase activity of ALG11 [endoplasmic reticulum membrane]
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