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Example sentences for: cyclases
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Classic adenylyl and guanylyl cyclases show a far more sporadic distribution, and are often present in multiple copies fused to a variety of signaling domains such as the cyclic nucleotide binding domains [ 24 ] . Cyclic nucleotide generating activity is not known to exist in a subset of the archaea [ 25 ] , though most of them contain a well-conserved copy of the CYTH domain.
Using sensitive sequence profile comparison methods, we show that the CyaB-like adenylyl cyclases are homologs of the soluble mammalian thiamine triphosphatases [ 17 ] , and they define a novel superfamily of enzymes that utilize ATP and other organic phosphates.
At convergence, this search detected, in addition to the soluble guanylyl cyclases from the animals, several bacterial proteins, including certain methyl-accepting chemotaxis receptors from bacteria such as Desulfovibrio and Clostridium . Transitive searches initiated with the small bacterial proteins that entirely correspond to the N-terminal-most domain of the SGCs also recovered the same set of proteins as observed in the earlier search, with e <.01.
They are likely to function as sensors of diffusible gaseous ligands that activate at least three distinct, downstream signaling pathways: namely phosphotransfer through the two-component systems, methyl ester-dependent chemotactic response and cyclic nucleotide signaling through the diguanylate cyclases/phosphodiesterases.
Using sequence profile searches we identify two conserved domains in the N-terminal extensions of the soluble guanylyl cyclases from animals.
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