Femtomolar sensitivity of a NO sensor from Clostridium botulinum
Femtomolar sensitivity of a NO sensor from Clostridium botulinum
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DOI：
10.1126/science.1103596
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发表时间：
2004-11-26
期刊：
影响因子：
56.9
通讯作者：
Raman, CS
中科院分区：
文献类型：
--
作者：
Nioche, P;Berka, V;Raman, CS
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.
