In cancer metabolism, changes in expression and regulation of protein are common. 6-phosphofructo-1-kinase is one of the important enzymes that regulates metabolic flow of glycolysis, and where it comes to drastic changes in enzyme, which consequently leads to deregulation of metabolic flow. Among currently noticed changes in photofructokinase are substitutions of isoenzyme form, creation of short, active fragments and no response to inhibition. We tried to find explanation, why do short fragments appear in case of cancer, how are they created and what features they have. We aligned the aminoacid sequences of isoenzymes in order to find potential cleaving sites and with them as the base, tried to find proteinase responsible for occurene of short fragments.
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