+------COMP:N-N(of)-----+     
     +MOD_PRED:N-+-COMP:ADJ-N(for)+               +MOD_ATT+     
     |           |                |               |       |     
 __NODE__ is necessary for phosphorylation of __NODE__ protein .
MOD_PRED:N-ADJ (__NODE__,necessary)
COMP:ADJ-N(for) (necessary,phosphorylation)
COMP:N-N(of) (phosphorylation,protein)
MOD_ATT:N-ADJ (protein,__NODE__)