Ancient conserved domains shared by animal soluble guanylyl cyclases and bacterial signaling proteins View Full Text


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Article Info

DATE

2003-02-03

AUTHORS

Lakshminarayan M Iyer, Vivek Anantharaman, L Aravind

ABSTRACT

BackgroundSoluble guanylyl cyclases (SGCs) are dimeric enzymes that transduce signals downstream of nitric oxide (NO) in animals. They sense NO by means of a heme moiety that is bound to their N-terminal extensions.ResultsUsing sequence profile searches we show that the N-terminal extensions of the SGCs contain two globular domains. The first of these, the HNOB (H eme NO Binding) domain, is a predominantly α-helical domain and binds heme via a covalent linkage to histidine. Versions lacking this conserved histidine and are likely to interact with heme non-covalently. We detected HNOB domains in several bacterial lineages, where they occur fused to methyl accepting domains of chemotaxis receptors or as standalone proteins. The standalone forms are encoded by predicted operons that also contain genes for two component signaling systems and GGDEF-type nucleotide cyclases. The second domain, the HNOB associated (HNOBA) domain occurs between the HNOB and the cyclase domains in the animal SGCs. The HNOBA domain is also detected in bacteria and is always encoded by a gene, which occurs in the neighborhood of a gene for a HNOB domain.ConclusionThe HNOB domain is predicted to function as a heme-dependent sensor for gaseous ligands, and transduce diverse downstream signals, in both bacteria and animals. The HNOBA domain functionally interacts with the HNOB domain, and possibly binds a ligand, either in cooperation, or independently of the latter domain. Phyletic profiles and phylogenetic analysis suggest that the HNOB and HNOBA domains were acquired by the animal lineage via lateral transfer from a bacterial source. More... »

PAGES

5

Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/1471-2164-4-5

DOI

http://dx.doi.org/10.1186/1471-2164-4-5

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1007993651

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/12590654


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