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Calcium signaling, one of the most widespread signaling mechanisms in cells, is generally carried out by EF-hand proteins, characterized by a helix–loop–helix motif paired in functional domains. EF-hand proteins may be viewed as molecular switches activated by calcium concentration transients. The EF-hand structural database has grown to a point where meaningful inferences on the functional conformational...
Abstract. The origin of the recently reported chemical shift changes of backbone amide nitrogens of redox proteins upon redox state changes has been investigated. These effects are particularly marked in cytochromes and are clearly present after correction for pseudocontact shifts in the oxidized form (Boyd J, Dobson CM, Morar AS, Williams RJP, Pielak GJ (1999) J Am Chem Soc 121:92479248; Guiles RD,...
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