+-----COMP:N-N(of)----+     
     +SUBJ:V_PASS+COMP:V_PASS-+             +MOD_ATT+     
     |           |            |             |       |     
 __NODE__ is involved in degradation of __NODE__ protein .
SUBJ:V_PASS-N (involve,__NODE__)
COMP:V_PASS-N(in) (involve,degradation)
COMP:N-N(of) (degradation,protein)
MOD_ATT:N-ADJ (protein,__NODE__)