Julian Gough, Cyrus Chothia  Structure 

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The Linked Conservation of Structure and Function in a Family of High Diversity  Julian Gough, Cyrus Chothia  Structure  Volume 12, Issue 6, Pages 917-925 (June 2004) DOI: 10.1016/j.str.2004.03.029

Figure 1 The Structure of Plastocyanin Viewed with the Second β Sheet behind the First Note the copper atom bound atop strands G and F of the first sheet, and the α helix and irregular loop region to right the edge of the two sheets. Structure 2004 12, 917-925DOI: (10.1016/j.str.2004.03.029)

Figure 2 The Conserved and Variable Regions of the Cupredoxin Family Three cupredoxin structures (plastocyanin, 1plc; rusticyanin, 1rcy; and pseudoazurin, 1paz) have been superposed. The yellow regions are aligned, and the bound copper atoms are green. The purple regions show the variation in structure of the nonconserved regions. Structure 2004 12, 917-925DOI: (10.1016/j.str.2004.03.029)

Figure 3 The Conserved Structure of the Members of the Cupredoxin Family (A) Plastocyanin subfamily, (B) rusticyanin-stellacyanin subfamily. The dashed lines represent hydrogen bonds, the solid lines the backbone of the chain, with the thicker sections for β strands. Each circle is a peptide with the darkness representing the surface accessible area. The darker the circle, the less accessible area, going from maximum exposure (white) to maximum buriedness (black). Note in the rusticyanin-stellacyanin subfamily the disruption of the left-hand edge caused by a change in the contiguous region including the tops of strands A and B. Note also the diagonal shaded areas marking the inner surfaces of the sheets contacting each other where they twist around each other. See also Figure 7. Structure 2004 12, 917-925DOI: (10.1016/j.str.2004.03.029)

Figure 4 The Key Features of the Conserved Core of the Cupredoxin Family Corresponding to Table 3 Residues B3 (YFW) and CD4 (VLIFW) are shown packing under the binding site residues. Dashed lines show the conserved hydrogen bonds. Within each box we give the sequence residues conserved at the sites and the average accessible surface area of sites in the seven structures. The boxes represent key residues with their possible amino acids and observed accessible surface area inside; large boxes are inward-facing residues which pack into the core or around the binding site, whereas small boxes are outward-facing residues. The circles represent other positions which are not in the buried inner core. Note the topmost box is the fifth and weakest (backbone oxygen) binding residue, and the four (large) underneath it are the tetrahedral binding residues. Structure 2004 12, 917-925DOI: (10.1016/j.str.2004.03.029)

Figure 5 The Copper Binding Site of Plastocyanin The copper atom and the residues which bind it are green. The backbone of sheet one is red and the backbone of sheet two is blue. The two base residues are in line, one in front of the other underneath the copper atom. The two histidines folding over above are side by side perpendicular to the two base residues. Structure 2004 12, 917-925DOI: (10.1016/j.str.2004.03.029)

Figure 6 The Tetrahedral Binding Site in Azurin (A) shows the side view in the same way as Figure 5 and (B) shows it rotated through 90°; now the histidines are in line and the base residues are side by side. The distances are marked in angstroms. Note there is a fifth additional, weaker bond formed by a backbone oxygen atom in this structure (Baker, 1988). In the other structures the oxygen is somewhat further away. Structure 2004 12, 917-925DOI: (10.1016/j.str.2004.03.029)

Figure 7 The Side Chains of Residues at the 20 Sites that Are Strongly Conserved The side chains are of two types: first, functional (Cu binding) residues and their immediate neighbors and, second, residues at sites that pack at the center of the sheet sheet contacts. The core structure of the cupredoxin family (plastocyanin shown) are rendered in space-fill. Atoms which are part of sheet one are yellow, those in sheet two are red. The binding site residues are green; only the two base residues are shown. Structure 2004 12, 917-925DOI: (10.1016/j.str.2004.03.029)