Volume 8, Issue 11, Pages (November 2000)

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Volume 8, Issue 11, Pages 1137-1146 (November 2000) Crystal Structure of the Human Acyl Protein Thioesterase I from a Single X-Ray Data Set to 1.5 Å  Yancho Devedjiev, Zbigniew Dauter, Sergey R. Kuznetsov, Teresa L.Z. Jones, Zygmunt S. Derewenda  Structure  Volume 8, Issue 11, Pages 1137-1146 (November 2000) DOI: 10.1016/S0969-2126(00)00529-3

Figure 1 Phasing of Human APT1 from Solvent Bromide Ions Representative 2Fo-Fc electron densities during the course of structure solution and refinement contoured at 1σ: (a) after DM; (b) after first wARP at 1.8 Å resolution; (c) after wARP at 1.5 Å resolution; and (d) refined model at 1.5 Å resolution. (e) Location of the Br− ions bound at the surface of hAPT1; hAPT1 dimer is shown by Cα trace with the catalytic triads shown in full. The difference anomalous Fourier map, which reveals the locations of the Br− ions, is based on a refined protein model and is contoured at a 4 σ level Structure 2000 8, 1137-1146DOI: (10.1016/S0969-2126(00)00529-3)

Figure 2 Structure of Human APT1 (a) Ribbon diagram presenting the secondary structure elements. Seven β strands (green arrows) are numbered sequentially from 2 to 8 (the canonical strand 1 is missing). Four short β irregular strands are denoted S1–S4. Five α helices (in blue) are labeled from A to F according to the structure of a canonical α/β hydrolase (see Figure 2). Four short helical segments (in dark blue) are labeled from G1 to G4. Catalytic residues Ser-114, Asp-169, and His-210 are shown as golden ball and stick models. (b) Topology diagram of a canonical α/β hydrolase. (c) Topology of human APT1. Eight strands (green arrows) labeled as β1–β8 and six helices (yellow rods) labeled as αA–αF constitute the canonical α/β fold. Human APT1 lacks the first β strand (β1), the fourth α helix (αD) is replaced by a short helical segment, G3, and there are additionally four short β strands (S1–S4). Blue circles show the catalytic residues in hAPT1 and in the canonical α/β hydrolase. The residue numbers at the N and C termini of hAPT1 correspond to the construct used in this study (see Experimental Procedures for details). (d) Stereo Cα trace of the protein molecule. Every twentieth residue is labeled Structure 2000 8, 1137-1146DOI: (10.1016/S0969-2126(00)00529-3)

Figure 3 Comparison of the Structures of hAPT1 and CPf (a) Ribbon presentation of the superposition of Cα atoms of carboxyl esterase (blue) onto the structure of hAPT1 (gold). Labeled active site residues are shown by ball and stick models. (b) Difference distance plot of the corresponding Cα atoms Structure 2000 8, 1137-1146DOI: (10.1016/S0969-2126(00)00529-3)

Figure 4 Sequence Alignment of the ACP1 Family of Enzymes Structure-guided sequence alignment of representative enzymes belonging to the APT/carboxylesterase family of α/β hydrolases: Xfast: Xylella fastidiosa, section 135 of 229 of the complete genome, code AE003989, 35% identity with hAPT1; Cpf: P. fluorescens carboxylesterase, code S79600, 34% identity with hAPT1; hAPT1: human acyl protein thioesterase 1; DrMel: Drosophila melanogaster, code AE003544, 51% identities with hAPT1; SCer: Saccharomyces cerevisiae DNA from chromosome XII right arm, code X89514, 36% identity with hAPT1 Structure 2000 8, 1137-1146DOI: (10.1016/S0969-2126(00)00529-3)

Figure 5 The Noncrystallographic hAPT1 Dimer (a) Cutaway view of the electrostatic potential surface of the noncrystallographic dimer; the cavity located at the dimer interface is shown in red, and the blue tube represents the backbone. Positively charged regions are blue and negative regions are red. (b) A comparison of the noncrystallographic dimer of hAPT1 and CPf dimer. A subunit of CPf (blue ribbons) is superimposed onto molecule A in hAPT1 dimer (gold ribbons) Structure 2000 8, 1137-1146DOI: (10.1016/S0969-2126(00)00529-3)

Figure 6 Active Site of hAPT1 (a) Electron density for the active site region of the refined model contoured at 1 σ level. Side chains of Ser-114, Asp-169, and His-203 are presented as ball and stick models, Wat-55 as a gray sphere, and Br− ion as a yellow sphere. (b) A view of the monomer obtained by 90° rotation around a horizontal axis. Labels show location of the active site residues Ser-114, Asp-169, and His-210 at the dimer interface Structure 2000 8, 1137-1146DOI: (10.1016/S0969-2126(00)00529-3)