The A-domains for modules 1 and 13 are related, eventhough the pocket code, per se, for the Trp1 module is quitedifferent (DVSSIGAV) from that for Kyn13 (Fig. 4a).Isolated DptD protein activates Trp as well as Kyn in vitro(Wessels et al., 1996), but reduced efficiency for incorporation of the former (26?6 % of maximum) suggeststhat module 13 does not primarily incorporate Trp(followed by post-synthetic modification for productionof A21978C), but rather incorporates Kyn or anotherintermediate. The grouping of the 3mGlu-activating Adomains from dpt and the CDA NRPS with those for Asnand Asp is consistent with an evolutionary commonalityfor modules that activate acidic amino acids and theirderivatives
The A-domains for modules 1 and 13 are related, eventhough the pocket code, per se, for the Trp1 module is quitedifferent (DVSSIGAV) from that for Kyn13 (Fig. 4a).Isolated DptD protein activates Trp as well as Kyn in vitro(Wessels et al., 1996), but reduced efficiency for incorporation of the former (26?6 % of maximum) suggeststhat module 13 does not primarily incorporate Trp(followed by post-synthetic modification for productionof A21978C), but rather incorporates Kyn or anotherintermediate. The grouping of the 3mGlu-activating Adomains from dpt and the CDA NRPS with those for Asnand Asp is consistent with an evolutionary commonalityfor modules that activate acidic amino acids and theirderivatives<br>
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