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. 2012 May 15;42(6):597–612. doi: 10.1016/j.ijpara.2012.04.005

Fig. 8.

Fig. 8

Plasmodium berghei subtilisin-like protease 1 (PbSUB1) prefers a P1′ Ser to Asp. Typical progress curves showing cleavage of fluorogenic substrate SERA4st1F-6R (6-iodoacetamido tetramethylrhodamine (6-IATR)-labelled Ac-CITAQDDEEC) by recombinant Plasmodium falciparum SUB1 catalytic domain (rPfSUB1cat; closed circles) and rPbSUB1cat (closed triangles), and cleavage of SERA4st1F-6R-S (6-IATR-labelled Ac-CITAQSDEEC) by rPfSUB1cat (closed squares) and rPbSUB1cat (closed diamonds). Substitution of the P1′ Asp in SERA4st1F-6R with a Ser in SERA4st1F-6R-S results in a 5.8-fold increase in initial hydrolysis rates by rPbSUB1cat, but has no significant effect on cleavage by rPfSUB1cat. Both substrates were used at 0.1 μM final concentration in the digestion reactions.