Journal
SCIENCE
Volume 306, Issue 5701, Pages 1550-1553Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1103596
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Funding
- NIAID NIH HHS [R01 AI054444-05, R01 AI054444] Funding Source: Medline
- PHS HHS [AY343540] Funding Source: Medline
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Nitric oxide (NO) is extremely toxic to Clostridium botulinum, but its molecular targets are unknown. Here, we identify a heme protein sensor (SONO) that displays femtomolar affinity for NO. The crystal structure of the SONO heme domain reveals a previously undescribed fold and a strategically placed tyrosine residue that modulates heme-nitrosyl coordination. Furthermore, the domain architecture of a SONO ortholog cloned from Chlamydomonas reinhardtii indicates that NO signaling through cyclic guanosine monophosphate arose before the origin of multicellular eukaryotes. Our findings have broad implications for understanding bacterial responses to NO, as well as for the activation of mammalian NO-sensitive guanylyl cyclase.
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