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Example sentences for: trpb
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As shown in Figure 2, both Anabaena and Nostoc exhibit the same relative order of operonic trp genes: trp Aa• trp Ab → trp D → trpEa → trpEb → trpB . trpAa and trpAb are fused, as indicated in Figure 2with a filled bar and in the text by the bullet in the notation: trpAa • trpAb . In Anabaena, qor (encoding NADPH: quinone reductase) has been inserted between trpD and trpEa . Another qor paralog is present elsewhere in the genome of Anabaena . Nostoc also has two qor paralogs, but neither resides within the tryptophan operon.
In Streptomyces coelicolor, trpAa/trpAb/trpB/trpD/aroA II are contained within a large cluster dedicated to antibiotic synthesis [ 41].
Kynureninase from C. psittaci is a key linker between the anthranilate-utilizing TrpB enzyme that initiates tryptophan biosynthesis in the parasite and the host kynurenine foramidase that generates kynurenine.
In A. pernix an inverted arrangement yields a divergent transcription of trpEa → trpEb_2 → trpC → trpD and trpB → trpAa → trpAb.
The pathway of tryptophan biosynthesis consists of five steps, and we have used the convention [ 30] of naming the genes in the order of the steps, trpA, trpB, trpC, trpD and trpE.