Words similar to nostoc
Example sentences for: nostoc
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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.
Filamentous cyanobacteria (such as Anabaena and Nostoc ) subscribe to a developmental program of heterocyst formation that is widely considered the primitive state and that correlates with their exceedingly large genomes.
If any of the trpAa • trpAb fusions, other than the Nostoc/Anabaena pair, have a common origin, similar flanking regions of gene organization might be expected since all of the fusions are of relatively recent origin.
A particularly fortuitous gene that could favor or disfavor the hypothesis of LGT of the aroA Iβ - tyrA (p) gene block in Anabaena/Nostoc is trpAa • trpAb , a fusion corresponding to two genes that are usually separate (free-standing).
An interesting finding was the grouping (albeit weak) of Nostoc muscorum and Synechosystis sp. with Deinococcus radiodurans to form a high level clade (Figure 1).
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