Creating more space in the active site of the tryptophan 7‐halogenase PrnA by exchanging the large amino acid phenylalanine for the smaller alanine makes it possible for the substrate to bind in different orientations (see picture; yellow PrnA, blue PrnAF103A variant). This results in halogenation of the differently bound substrate in the 5‐position of the indole ring.
Platz gemacht: Indem man durch den Austausch der großen Aminosäure Phenylalanin (F103) gegen das kleinere Alanin mehr Platz im aktiven Zentrum der Tryptophan‐7‐Halogenase PrnA schafft, sollte es dem Substrat möglich sein, in einer anderen Orientierung zu binden (siehe Bild; gelb: native PrnA, blau: PrnA F103A‐Variante). Dies führt zur Halogenierung des unterschiedlich gebundenen Substrats in der 5‐Position des Indolrings.
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