Words similar to trpab
Example sentences for: trpab
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Surprisingly, each of the 10 fusion domains clustered tightly on the TrpAa and TrpAb trees, to the exclusion of the free-standing TrpAa and TrpAb domains.
These include the overall gene organization of the trp operon, for which many microbial patterns are known; the extremely rare gene order of trpEa trpEb instead of the typical order trpEb trpEa; the fusion of genes encoding the alpha ( trpAa ) and beta ( trpAb ) subunits of anthranilate synthase, a fusion that exists in only a limited number of other taxa, and the presence of operonic genes exhibiting distinctive homology subtypes ( aroA Iβ and tyrA (p) ).
Thus, in X. fastidiosa the incongruous phylogenetic position of trpR , the redundancy of the trp -linked genes encoding trpAa and trpAb , and the distinct phylogenetic incongruence of the latter gene pair all supported a reasonable possibility of origin by LGT.
Thus, Anabaena has two additional extra-operonic paralogs of aroA Iβ and trpD . In addition to extra-operonic, free-standing copies of trpAa and trpAb , a second fused gene ( trpAa • trpAb_2 ) encoding the two domains of anthranilate synthase is present in Anabaena . Nostoc has two extra-operonic copies of aroA Iβ , aroB and trpD . All cyanobacteria possess AroA of the Iβ class ( aroA Iβ ). While this is also true of the Anabaena/Nostoc lineage (in fact, having multiple copies), both Anabaena and Nostoc possess an additional gene encoding AroA of the Iα class ( aroA Iα ). All cyanobacteria possess a tyrA gene of the arogenate-specificity class ( tyrA a ), but the Anabaena/Nostoc supraoperons also possess a tyrA gene deemed to be a cyclohexadienyl dehydrogenase [ 28] with a favored specificity for prephenate ( tyrA (p) ) (C.A.B.
These observations imply that within the span of phylogeny shown in Figure 9, the trpAa • trpAb fusion may have occurred independently as many as seven times.
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