3av8

Refined Structure of Plant-type [2Fe-2S] Ferredoxin I from Aphanothece sacrum at 1.46 A Resolution

spinqualitylabelsall models 3av8, resolution 1.46Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3av8 is a 4 chain structure with sequence from Aphanothece sacrum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: FES, SO4 Related: 1fxi Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed Knowing the manner of protein-protein interactions is vital for understanding biological events. The plant-type [2Fe-2S] ferredoxin (Fd), a well-known small iron-sulfur protein with low redox potential, partitions electrons to a variety of Fd-dependent enzymes via specific protein-protein interactions. Here we have refined the crystal structure of a recombinant plant-type Fd I from the blue green alga Aphanothece sacrum (AsFd-I) at 1.46 A resolution on the basis of the synchrotron radiation data. Incorporating the revised amino-acid sequence, our analysis corrects the 3D structure previously reported; we identified the short alpha-helix (67-71) near the active center, which is conserved in other plant-type [2Fe-2S] Fds. Although the 3D structures of the four molecules in the asymmetric unit are similar to each other, detailed comparison of the four structures revealed the segments whose conformations are variable. Structural comparison between the Fds from different sources showed that the distribution of the variable segments in AsFd-I is highly conserved in other Fds, suggesting the presence of intrinsically flexible regions in the plant-type [2Fe-2S] Fd. A few structures of the complexes with Fd-dependent enzymes clearly demonstrate that the protein-protein interactions are achieved through these variable regions in Fd. The results described here will provide a guide for interpreting the biochemical and mutational studies that aim at the manner of interactions with Fd-dependent enzymes. Mapping of protein-protein interaction sites in the plant-type [2Fe-2S] ferredoxin.,Kameda H, Hirabayashi K, Wada K, Fukuyama K PLoS One. 2011;6(7):e21947. Epub 2011 Jul 8. PMID:21760931 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Ferredoxin

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