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EC Number
Fe-S center
Fe-S center
the enzyme contains a [4Fe-4S]2+/1+ cluster and a siroheme active site
the enzyme can use its endogenous ferredoxin as well as the ferredoxin pssm2-Fd from its parasite myovirus P-SSM2. pssm2-Fd contains sequence features of host Fds, structure of the pssm2-Fd and structure comparisons, overview. Prochlorococcus marinus ferredoxin contains [4Fe-4S] centers, the myoviral ferredoxin contains [2Fe-2S] centers
iron-sulfur centre
methyl viologen
artificial cofactor
when expressed in an Escherichia coli strain deficient in sulfite assimilation, pssm2-Fd complements bacterial growth when coexpressed with a Prochlorococcus marinus sulfite reductase, revealing that pssm2-Fd can transfer electrons to a host protein involved in nutrient assimilation. The high levels of structural similarity with cyanobacterial Fds and reactivity with a host sulfite reductase suggest that phage Fds evolved to transfer electrons to cyanobacterially encoded oxidoreductases. The phage Fds all localize to cluster VI, in close association with cyanobacterial Fds. Among the Fds in cluster VI, interactions with a range of oxidoreductases have been documented. Evaluation of the surface charge distribution of several different Fd and SIR structures
1 mol per mol subunit, in the high-spin Fe3+ state in the reduced enzyme
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