dol-P-Man:Man(3)GlcN-acyl-PI alpha-1,2-mannosyltransferase activity
Catalysis of the transfer of an alpha-D-mannosyl residue from dolichol-P-mannose to Man(3)-GlcN-acyl-PI, forming an alpha-(1->2)-D-mannosyl-D-mannose linkage. This transfers a fourth mannose to the GPI precursor, which is only present in some organisms/cell types.
GO:0000026
alpha-1,2-mannosyltransferase activity
is_a
GO:0004376
GPI mannosyltransferase activity
is_a
GPI-MT-IV activity
exact
glycosylphosphatidylinositol-mannosyltransferase IV activity
exact
SPAC4G8.12c