+---------------------SUBJ:V-N---------------------+    
      +---------------COMP:N-N(of)---------------+       |    
      +----------COMP:N-N(of)---------+          |       |    
      |                  +-MOD_ATT:N-N+          |       |    
      |                  |            |          |       |    
 Interaction of phosphofructokinase [Pfk] and tubulin occurs .
COMP:N-N(of) (interaction,[Pfk])
COMP:N-N(of) (interaction,tubulin)
MOD_ATT:N-N ([Pfk],phosphofructokinase)
SUBJ:V-N (occur,interaction)