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Example sentences for: anabaena
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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.
In Nostoc, tyrP1 (encoding tyrosinase) has been inserted between trpEa and trpEb . All other cyanobacteria, including Anabaena , lack tyrP1 . The two trp operons are less compact than frequently observed elsewhere, and relatively large intergenic spacing exists, especially in N. punctiforme . The only instance of translational coupling is between trpAa • trpAb and trpD in N. punctiforme .
These are defined by points of speciation divergence between Anabaena/Nostoc and other cyanobacteria, between the
Although the Anabaena/Nostoc operon only lacks trpC , its features of gene fusion and gene organization are novel.
One of these proteins from Anabaena cylindrica is exclusively expressed in the spore-like akinetes [ 32], though its actual function remains unknown.
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