Abstract
Apicomplexan protists contain a single mitochondrial [2Fe2S] ferredoxin sequence (mtFd) with a highly conserved C-terminal motif, VDGxxpxPH, that distinguishes it from other mtFd, which have heterogeneous C-termini. This isoform of mtFd, called ‘type II ferredoxin’, is widespread in eukaryotes, some species having two isoforms and others possessing only one. Because of the known modulating role of the C-terminus of type I mtFd during association with itself and other interacting proteins, the presence of a conserved C-terminus in type II mtFd suggests it evolved either as a means for optimized homodimerization or to allow interaction with a highly conserved partner(s) that is yet to be defined.
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