Crystal Structure of Streptococcus mutans Pyrophosphatase

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Crystal Structure of Streptococcus mutans Pyrophosphatase Michael C Merckel, Igor P Fabrichniy, Anu Salminen, Nisse Kalkkinen, Alexander A Baykov, Reijo Lahti, Adrian Goldman  Structure  Volume 9, Issue 4, Pages 289-297 (April 2001) DOI: 10.1016/S0969-2126(01)00587-1

Figure 1 Overall Structure of the Sm-PPase Monomer (a) Stereoview of the Sm-PPase monomer Cα trace. Color coding is from blue to red from N to C termini. The N and C termini are indicated, and every 10th residue is numbered. Metals are green, and sulphates are yellow and red. (b) Stereoview of monomer highlighting the secondary structure elements of Sm-PPase. Color coding is the same as in (a), and the view is roughly 90° to (a). β strands are labeled 1–10, and α helices are labeled A–L. (c) A representation of the topology of Sm-PPase monomer. N-terminal (lower) and C-terminal (upper) domains are highlighted in gray. α helices (red) and β strands (blue) are labeled as in (b). The start and end residues of the secondary structure elements are β1, K2–G7; αA, S13–G30; β2, A33–L38; αB, E43–F52; αC, S62–G67; β3, Q70–D75; β4, E90–D96; β5, L109–E114; αD, A119–N130; αE, K136–D149; αF, D162–G174; αG, Q178–T189; αH, A196–I202, β6, D203–L209; β7, S212–T221; αI, I224–L228; αJ, Q231–N245; β8, S248–D256; β9, N261–G268; αK, T271–F278; β10, H286–G291; and αL, V300–S306 Structure 2001 9, 289-297DOI: (10.1016/S0969-2126(01)00587-1)

Figure 1 Overall Structure of the Sm-PPase Monomer (a) Stereoview of the Sm-PPase monomer Cα trace. Color coding is from blue to red from N to C termini. The N and C termini are indicated, and every 10th residue is numbered. Metals are green, and sulphates are yellow and red. (b) Stereoview of monomer highlighting the secondary structure elements of Sm-PPase. Color coding is the same as in (a), and the view is roughly 90° to (a). β strands are labeled 1–10, and α helices are labeled A–L. (c) A representation of the topology of Sm-PPase monomer. N-terminal (lower) and C-terminal (upper) domains are highlighted in gray. α helices (red) and β strands (blue) are labeled as in (b). The start and end residues of the secondary structure elements are β1, K2–G7; αA, S13–G30; β2, A33–L38; αB, E43–F52; αC, S62–G67; β3, Q70–D75; β4, E90–D96; β5, L109–E114; αD, A119–N130; αE, K136–D149; αF, D162–G174; αG, Q178–T189; αH, A196–I202, β6, D203–L209; β7, S212–T221; αI, I224–L228; αJ, Q231–N245; β8, S248–D256; β9, N261–G268; αK, T271–F278; β10, H286–G291; and αL, V300–S306 Structure 2001 9, 289-297DOI: (10.1016/S0969-2126(01)00587-1)

Figure 1 Overall Structure of the Sm-PPase Monomer (a) Stereoview of the Sm-PPase monomer Cα trace. Color coding is from blue to red from N to C termini. The N and C termini are indicated, and every 10th residue is numbered. Metals are green, and sulphates are yellow and red. (b) Stereoview of monomer highlighting the secondary structure elements of Sm-PPase. Color coding is the same as in (a), and the view is roughly 90° to (a). β strands are labeled 1–10, and α helices are labeled A–L. (c) A representation of the topology of Sm-PPase monomer. N-terminal (lower) and C-terminal (upper) domains are highlighted in gray. α helices (red) and β strands (blue) are labeled as in (b). The start and end residues of the secondary structure elements are β1, K2–G7; αA, S13–G30; β2, A33–L38; αB, E43–F52; αC, S62–G67; β3, Q70–D75; β4, E90–D96; β5, L109–E114; αD, A119–N130; αE, K136–D149; αF, D162–G174; αG, Q178–T189; αH, A196–I202, β6, D203–L209; β7, S212–T221; αI, I224–L228; αJ, Q231–N245; β8, S248–D256; β9, N261–G268; αK, T271–F278; β10, H286–G291; and αL, V300–S306 Structure 2001 9, 289-297DOI: (10.1016/S0969-2126(01)00587-1)

Figure 2 Comparison of Sm-PPase and Y-PPase Folds The overall fold of Sm-PPase (left) and Y-PPase (right). Chains are color coded blue to red from N to C termini. The orientation of Y-PPase is such that the active site metals and phosphates are least-squares fitted to the corresponding Sm-PPase metals and sulfates Structure 2001 9, 289-297DOI: (10.1016/S0969-2126(01)00587-1)

Figure 3 The Sm-PPase Dimer (a) Stereoview of Sm-PPase dimer. Monomer one is above and red; monomer two is below and green. The metal ions and sulphate are in green and yellow, respectively, showing that they are close to the domain interface. (b) Closeup steroview of the dimer interface. Residues 99–115 are depicted as sticks, and residues R99, V100, T105, M111, and L113 are labeled. Hydrogen bonds are shown as black lines. Color coding is as in (a) Structure 2001 9, 289-297DOI: (10.1016/S0969-2126(01)00587-1)

Figure 3 The Sm-PPase Dimer (a) Stereoview of Sm-PPase dimer. Monomer one is above and red; monomer two is below and green. The metal ions and sulphate are in green and yellow, respectively, showing that they are close to the domain interface. (b) Closeup steroview of the dimer interface. Residues 99–115 are depicted as sticks, and residues R99, V100, T105, M111, and L113 are labeled. Hydrogen bonds are shown as black lines. Color coding is as in (a) Structure 2001 9, 289-297DOI: (10.1016/S0969-2126(01)00587-1)

Figure 4 Active Site of Sm-PPase and Comparison with Y-PPase Active Site (a) Stereoview of initial solvent-flattened NCS-averaged MAD map of the active site region of Sm-PPase. The map is shown in gray contoured at 1.5 σ and red contoured at 5.0 σ to highlight the large peaks associated with metals M1, M2, and the sulphate ions. The fit of the refined structure to the model is shown with atoms color coded by type: dark grey, carbon; blue, nitrogen; red, oxygen; yellow, sulphur; and green, metal ions. (b) Stereoview of active site residues and ligands. Acidic residues are red, basic residues are blue, metals are green, sulphates are yellow, and waters are white. Solid black lines illustrate bonds to atoms in coordination and hydrogen bonding positions. H98 has been omitted for clarity. Sul1 and Sul2 refer to Sul405 and Sul404; and M1, M2, and M3 refer to M401, M402, and M403, respectively (Table 1). (c) Stereoview of the superposition of the active sites of Y-PPase in the product complex form [15] on Sm-PPase. Sm-PPase is shown in green, and Y-PPase in red; nucleophilic waters are smaller spheres. The fourth Y-PPase metal, shown in the middle left, does not have an Sm-PPase counterpart. Residues specific to each active site (see text) are labeled by amino acid code, sequence number, and color coded for the respective structure Structure 2001 9, 289-297DOI: (10.1016/S0969-2126(01)00587-1)

Figure 4 Active Site of Sm-PPase and Comparison with Y-PPase Active Site (a) Stereoview of initial solvent-flattened NCS-averaged MAD map of the active site region of Sm-PPase. The map is shown in gray contoured at 1.5 σ and red contoured at 5.0 σ to highlight the large peaks associated with metals M1, M2, and the sulphate ions. The fit of the refined structure to the model is shown with atoms color coded by type: dark grey, carbon; blue, nitrogen; red, oxygen; yellow, sulphur; and green, metal ions. (b) Stereoview of active site residues and ligands. Acidic residues are red, basic residues are blue, metals are green, sulphates are yellow, and waters are white. Solid black lines illustrate bonds to atoms in coordination and hydrogen bonding positions. H98 has been omitted for clarity. Sul1 and Sul2 refer to Sul405 and Sul404; and M1, M2, and M3 refer to M401, M402, and M403, respectively (Table 1). (c) Stereoview of the superposition of the active sites of Y-PPase in the product complex form [15] on Sm-PPase. Sm-PPase is shown in green, and Y-PPase in red; nucleophilic waters are smaller spheres. The fourth Y-PPase metal, shown in the middle left, does not have an Sm-PPase counterpart. Residues specific to each active site (see text) are labeled by amino acid code, sequence number, and color coded for the respective structure Structure 2001 9, 289-297DOI: (10.1016/S0969-2126(01)00587-1)

Figure 4 Active Site of Sm-PPase and Comparison with Y-PPase Active Site (a) Stereoview of initial solvent-flattened NCS-averaged MAD map of the active site region of Sm-PPase. The map is shown in gray contoured at 1.5 σ and red contoured at 5.0 σ to highlight the large peaks associated with metals M1, M2, and the sulphate ions. The fit of the refined structure to the model is shown with atoms color coded by type: dark grey, carbon; blue, nitrogen; red, oxygen; yellow, sulphur; and green, metal ions. (b) Stereoview of active site residues and ligands. Acidic residues are red, basic residues are blue, metals are green, sulphates are yellow, and waters are white. Solid black lines illustrate bonds to atoms in coordination and hydrogen bonding positions. H98 has been omitted for clarity. Sul1 and Sul2 refer to Sul405 and Sul404; and M1, M2, and M3 refer to M401, M402, and M403, respectively (Table 1). (c) Stereoview of the superposition of the active sites of Y-PPase in the product complex form [15] on Sm-PPase. Sm-PPase is shown in green, and Y-PPase in red; nucleophilic waters are smaller spheres. The fourth Y-PPase metal, shown in the middle left, does not have an Sm-PPase counterpart. Residues specific to each active site (see text) are labeled by amino acid code, sequence number, and color coded for the respective structure Structure 2001 9, 289-297DOI: (10.1016/S0969-2126(01)00587-1)

Figure 5 Superposition of Monomers One and Two Stereoview of the superposition of monomer one and monomer two, with monomer one in red and monomer two in green. The N-terminal domains of each monomer have been superimposed (rmsd, 0.4 Å/Cα) so that the 8 Å rigid body shift of the C-terminal domains can be seen. The rotation axis is shown as a black rod. Figures were generated with Molscript and Raster3D [27, 28] Structure 2001 9, 289-297DOI: (10.1016/S0969-2126(01)00587-1)