( ( As ( with ( all enzymes ) ) ) ( , ( pectinases ( ( have ( ( an ( optimum ( ( temperature and ) pH ) ) ) ( ( at which ) ( they ( are ( most active ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN As) (PP (IN with) (NP (DT all) (NNS enzymes)))) (, ,) (NP (NNS pectinases)) (VP (VBP have) (NP (NP (DT an) (JJ optimum) (NN temperature) (CC and) (NN pH)) (SBAR (WHPP (IN at) (WHNP (WDT which))) (S (NP (PRP they)) (VP (VBP are) (ADJP (RBS most) (JJ active))))))) (. .)))
As with all enzymes, pectinases have an optimum temperature and pH at which they are most active.
(ROOT (S (NP (DT All) (NNS enzymes)) (VP (VBP have) (NP (DT an) (JJ optimal) (NN temperature) (CC and) (NN ph.)))))