1QK5 - Header Asymmetric Unit

HEADER TRANSFERASE 09-JUL-99 1QK5

TITLE TOXOPLASMA GONDII HYPOXANTHINE-GUANINE TITLE 2 PHOSPHORIBOSYLTRANSFERASE WITH XMP, PYROPHOSPHATE AND TWO TITLE 3 MG2+ IONS

COMPND MOL_ID: 1; COMPND 2 MOLECULE: HYPOXANTHINE-GUANINE PHOSPHORIBOSYLTRANSFERASE; COMPND 3 CHAIN: A, B; COMPND 4 SYNONYM: HGPRTASE; COMPND 5 EC: 2.4.2.8; COMPND 6 ENGINEERED: YES; COMPND 7 MUTATION: YES

SOURCE MOL_ID: 1; SOURCE 2 ORGANISM_SCIENTIFIC: TOXOPLASMA GONDII; SOURCE 3 ORGANISM_TAXID: 383379; SOURCE 4 STRAIN: RH; SOURCE 5 EXPRESSION_SYSTEM: ESCHERICHIA COLI; SOURCE 6 EXPRESSION_SYSTEM_TAXID: 469008; SOURCE 7 EXPRESSION_SYSTEM_STRAIN: BL21(DE3); SOURCE 8 EXPRESSION_SYSTEM_VECTOR: PET15B; SOURCE 9 EXPRESSION_SYSTEM_PLASMID: PETC1-D150A

KEYWDS TRANSFERASE, GLYCOSYLTRANSFERASE, PURINE SALVAGE

EXPDTA X-RAY DIFFRACTION

AUTHOR A.HEROUX,E.L.WHITE,L.J.ROSS,R.L.DAVIS,D.W.BORHANI

REVDAT 4 24-FEB-09 1QK5 1 VERSN REVDAT 3 10-DEC-99 1QK5 1 JRNL REVDAT 2 14-NOV-99 1QK5 1 JRNL REVDAT 1 17-OCT-99 1QK5 0

JRNL AUTH A.HEROUX,E.L.WHITE,L.J.ROSS,R.L.DAVIS,D.W.BORHANI JRNL TITL CRYSTAL STRUCTURE OF TOXOPLASMA GONDII JRNL TITL 2 HYPOXANTHINE-GUANINE PHOSPHORIBOSYLTRANSFERASE JRNL TITL 3 WITH XMP, PYROPHOSPHATE AND TWO MG2+ IONS BOUND: JRNL TITL 4 INSIGHTS INTO THE CATALYTIC MECHANISM JRNL REF BIOCHEMISTRY V. 38 14495 1999 JRNL REFN ISSN 0006-2960 JRNL PMID 10545171 JRNL DOI 10.1021/BI990508I

REMARK 1 REMARK 1 REFERENCE 1 REMARK 1 AUTH A.HEROUX,E.L.WHITE,L.J.ROSS,D.W.BORHANI REMARK 1 TITL CRYSTAL STRUCTURES OF THE TOXOPLASMA GONDII REMARK 1 TITL 2 HYPOXANTHINE-GUANINE PHOSPHORIBOSYLTRANSFERASE GMP REMARK 1 TITL 3 AND IMP COMPLEXES: COMPARISON OF PURINE BINDING REMARK 1 TITL 4 INTERACTIONS WITH THE XMP COMPLEX REMARK 1 REF BIOCHEMISTRY V. 38 14485 1999 REMARK 1 REFN ISSN 0006-2960 REMARK 1 PMID 10545170 REMARK 1 DOI 10.1021/BI990507Q REMARK 1 REMARK 1 REFERENCE 2 REMARK 1 AUTH G.VASANTHAKUMAR,S.VAN GINKEL,G.PARISH REMARK 1 TITL ISOLATION AND SEQUENCING OF A CDNA ENCODING THE REMARK 1 TITL 2 HYPOXANTHINE-GUANINE PHOSPHORIBOSYLTRANSFERASE REMARK 1 TITL 3 FROM TOXOPLASMA GONDII REMARK 1 REF GENE V. 147 153 1994 REMARK 1 REFN ISSN 0378-1119 REMARK 1 PMID 8088544 REMARK 1 DOI 10.1016/0378-1119(94)90058-2

REMARK 2 REMARK 2 RESOLUTION. 1.6 ANGSTROMS.

REMARK 3 REMARK 3 REFINEMENT. REMARK 3 PROGRAM : REFMAC REMARK 3 AUTHORS : MURSHUDOV,VAGIN,DODSON REMARK 3 REMARK 3 DATA USED IN REFINEMENT. REMARK 3 RESOLUTION RANGE HIGH (ANGSTROMS) : 1.60 REMARK 3 RESOLUTION RANGE LOW (ANGSTROMS) : 13.0 REMARK 3 DATA CUTOFF (SIGMA(F)) : 0.0 REMARK 3 COMPLETENESS FOR RANGE (%) : 98.0 REMARK 3 NUMBER OF REFLECTIONS : 55139 REMARK 3 REMARK 3 FIT TO DATA USED IN REFINEMENT. REMARK 3 CROSS-VALIDATION METHOD : THROUGHOUT REMARK 3 FREE R VALUE TEST SET SELECTION : RANDOM REMARK 3 R VALUE (WORKING + TEST SET) : NULL REMARK 3 R VALUE (WORKING SET) : 0.23351 REMARK 3 FREE R VALUE : 0.26099 REMARK 3 FREE R VALUE TEST SET SIZE (%) : 5.0 REMARK 3 FREE R VALUE TEST SET COUNT : 2953 REMARK 3 REMARK 3 NUMBER OF NON-HYDROGEN ATOMS USED IN REFINEMENT. REMARK 3 PROTEIN ATOMS : 3472 REMARK 3 NUCLEIC ACID ATOMS : 0 REMARK 3 HETEROGEN ATOMS : 70 REMARK 3 SOLVENT ATOMS : 182 REMARK 3 REMARK 3 B VALUES. REMARK 3 FROM WILSON PLOT (A**2) : 24.140 REMARK 3 MEAN B VALUE (OVERALL, A**2) : 25.06 REMARK 3 OVERALL ANISOTROPIC B VALUE. REMARK 3 B11 (A**2) : NULL REMARK 3 B22 (A**2) : NULL REMARK 3 B33 (A**2) : NULL REMARK 3 B12 (A**2) : NULL REMARK 3 B13 (A**2) : NULL REMARK 3 B23 (A**2) : NULL REMARK 3 REMARK 3 ESTIMATED OVERALL COORDINATE ERROR. REMARK 3 ESU BASED ON R VALUE (A): 0.11647 REMARK 3 ESU BASED ON FREE R VALUE (A): 0.11121 REMARK 3 ESU BASED ON MAXIMUM LIKELIHOOD (A): NULL REMARK 3 ESU FOR B VALUES BASED ON MAXIMUM LIKELIHOOD (A**2): NULL REMARK 3 REMARK 3 RMS DEVIATIONS FROM IDEAL VALUES. REMARK 3 DISTANCE RESTRAINTS. RMS SIGMA REMARK 3 BOND LENGTH (A) : 0.015 ; 0.020 REMARK 3 ANGLE DISTANCE (A) : 0.040 ; 0.040 REMARK 3 INTRAPLANAR 1-4 DISTANCE (A) : 0.038 ; 0.05 REMARK 3 H-BOND OR METAL COORDINATION (A) : NULL ; NULL REMARK 3 REMARK 3 PLANE RESTRAINT (A) : 0.012 ; 0.020 REMARK 3 CHIRAL-CENTER RESTRAINT (A**3) : 0.147 ; 0.150 REMARK 3 REMARK 3 NON-BONDED CONTACT RESTRAINTS. REMARK 3 SINGLE TORSION (A) : NULL ; NULL REMARK 3 MULTIPLE TORSION (A) : NULL ; NULL REMARK 3 H-BOND (X...Y) (A) : NULL ; NULL REMARK 3 H-BOND (X-H...Y) (A) : NULL ; NULL REMARK 3 REMARK 3 CONFORMATIONAL TORSION ANGLE RESTRAINTS. REMARK 3 SPECIFIED (DEGREES) : NULL ; NULL REMARK 3 PLANAR (DEGREES) : NULL ; NULL REMARK 3 STAGGERED (DEGREES) : NULL ; NULL REMARK 3 TRANSVERSE (DEGREES) : NULL ; NULL REMARK 3 REMARK 3 ISOTROPIC THERMAL FACTOR RESTRAINTS. RMS SIGMA REMARK 3 MAIN-CHAIN BOND (A**2) : 1.709 ; 2.000 REMARK 3 MAIN-CHAIN ANGLE (A**2) : 2.466 ; 3.000 REMARK 3 SIDE-CHAIN BOND (A**2) : 2.282 ; 2.000 REMARK 3 SIDE-CHAIN ANGLE (A**2) : 3.530 ; 3.000 REMARK 3 REMARK 3 OTHER REFINEMENT REMARKS: NO RESTRAINTS WERE IMPOSED ON THE REMARK 3 ATOMS OF THE PYROPHOSPHATE GROUPS OR MAGNESIUM CATIONS.

REMARK 4 REMARK 4 1QK5 COMPLIES WITH FORMAT V. 3.15, 01-DEC-08

REMARK 100 REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY PDBE ON 12-JUL-99. REMARK 100 THE PDBE ID CODE IS EBI-2918.

REMARK 200 REMARK 200 EXPERIMENTAL DETAILS REMARK 200 EXPERIMENT TYPE : X-RAY DIFFRACTION REMARK 200 DATE OF DATA COLLECTION : 15-FEB-98 REMARK 200 TEMPERATURE (KELVIN) : 100.0 REMARK 200 PH : 8.50 REMARK 200 NUMBER OF CRYSTALS USED : 1 REMARK 200 REMARK 200 SYNCHROTRON (Y/N) : Y REMARK 200 RADIATION SOURCE : NSLS REMARK 200 BEAMLINE : X25 REMARK 200 X-RAY GENERATOR MODEL : NULL REMARK 200 MONOCHROMATIC OR LAUE (M/L) : M REMARK 200 WAVELENGTH OR RANGE (A) : 1.10 REMARK 200 MONOCHROMATOR : SI(111) REMARK 200 OPTICS : PT-COATED MIRROR REMARK 200 REMARK 200 DETECTOR TYPE : CCD REMARK 200 DETECTOR MANUFACTURER : PRINCETON SCIENTIFIC REMARK 200 INSTRUMENTS 2K CCD REMARK 200 INTENSITY-INTEGRATION SOFTWARE : MOSFLM REMARK 200 DATA SCALING SOFTWARE : CCP4 (SCALA) REMARK 200 REMARK 200 NUMBER OF UNIQUE REFLECTIONS : 58200 REMARK 200 RESOLUTION RANGE HIGH (A) : 1.600 REMARK 200 RESOLUTION RANGE LOW (A) : 13.000 REMARK 200 REJECTION CRITERIA (SIGMA(I)) : NULL REMARK 200 REMARK 200 OVERALL. REMARK 200 COMPLETENESS FOR RANGE (%) : 98.0 REMARK 200 DATA REDUNDANCY : 4.200 REMARK 200 R MERGE (I) : NULL REMARK 200 R SYM (I) : 0.07600 REMARK 200 <I/SIGMA(I)> FOR THE DATA SET : 10.3000 REMARK 200 REMARK 200 IN THE HIGHEST RESOLUTION SHELL. REMARK 200 HIGHEST RESOLUTION SHELL, RANGE HIGH (A) : 1.60 REMARK 200 HIGHEST RESOLUTION SHELL, RANGE LOW (A) : 1.66 REMARK 200 COMPLETENESS FOR SHELL (%) : 93.9 REMARK 200 DATA REDUNDANCY IN SHELL : 3.70 REMARK 200 R MERGE FOR SHELL (I) : NULL REMARK 200 R SYM FOR SHELL (I) : 0.37300 REMARK 200 <I/SIGMA(I)> FOR SHELL : 2.400 REMARK 200 REMARK 200 DIFFRACTION PROTOCOL: SINGLE WAVELENGTH REMARK 200 METHOD USED TO DETERMINE THE STRUCTURE: MOLECULAR REPLACEMENT REMARK 200 SOFTWARE USED: AMORE REMARK 200 STARTING MODEL: PDB ENTRY 1QK3, SUBUNIT A, WITHOUT LOOPS, REMARK 200 WATERS, OR GMP REMARK 200 REMARK 200 REMARK: NULL

REMARK 280 REMARK 280 CRYSTAL REMARK 280 SOLVENT CONTENT, VS (%): 43 REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 2.09 REMARK 280 REMARK 280 CRYSTALLIZATION CONDITIONS: 30% PEG 4000, 100 MM TRIS.CL (PH 8.5), REMARK 280 200 MM LI2SO4, 0.25 % BETA-OCTYLGLUCOPYRANOSIDE. THE CRYSTAL WAS REMARK 280 GROWN IN THE PRESENCE OF 1 MM XANTHINE, 1 MM PRPP AND REMARK 280 10 MM MGCL2 AT 277 K.

REMARK 290 REMARK 290 CRYSTALLOGRAPHIC SYMMETRY REMARK 290 SYMMETRY OPERATORS FOR SPACE GROUP: C 2 2 21 REMARK 290 REMARK 290 SYMOP SYMMETRY REMARK 290 NNNMMM OPERATOR REMARK 290 1555 X,Y,Z REMARK 290 2555 -X,-Y,Z+1/2 REMARK 290 3555 -X,Y,-Z+1/2 REMARK 290 4555 X,-Y,-Z REMARK 290 5555 X+1/2,Y+1/2,Z REMARK 290 6555 -X+1/2,-Y+1/2,Z+1/2 REMARK 290 7555 -X+1/2,Y+1/2,-Z+1/2 REMARK 290 8555 X+1/2,-Y+1/2,-Z REMARK 290 REMARK 290 WHERE NNN -> OPERATOR NUMBER REMARK 290 MMM -> TRANSLATION VECTOR REMARK 290 REMARK 290 CRYSTALLOGRAPHIC SYMMETRY TRANSFORMATIONS REMARK 290 THE FOLLOWING TRANSFORMATIONS OPERATE ON THE ATOM/HETATM REMARK 290 RECORDS IN THIS ENTRY TO PRODUCE CRYSTALLOGRAPHICALLY REMARK 290 RELATED MOLECULES. REMARK 290 SMTRY1 1 1.000000 0.000000 0.000000 0.00000 REMARK 290 SMTRY2 1 0.000000 1.000000 0.000000 0.00000 REMARK 290 SMTRY3 1 0.000000 0.000000 1.000000 0.00000 REMARK 290 SMTRY1 2 -1.000000 0.000000 0.000000 0.00000 REMARK 290 SMTRY2 2 0.000000 -1.000000 0.000000 0.00000 REMARK 290 SMTRY3 2 0.000000 0.000000 1.000000 72.14000 REMARK 290 SMTRY1 3 -1.000000 0.000000 0.000000 0.00000 REMARK 290 SMTRY2 3 0.000000 1.000000 0.000000 0.00000 REMARK 290 SMTRY3 3 0.000000 0.000000 -1.000000 72.14000 REMARK 290 SMTRY1 4 1.000000 0.000000 0.000000 0.00000 REMARK 290 SMTRY2 4 0.000000 -1.000000 0.000000 0.00000 REMARK 290 SMTRY3 4 0.000000 0.000000 -1.000000 0.00000 REMARK 290 SMTRY1 5 1.000000 0.000000 0.000000 27.60400 REMARK 290 SMTRY2 5 0.000000 1.000000 0.000000 56.12750 REMARK 290 SMTRY3 5 0.000000 0.000000 1.000000 0.00000 REMARK 290 SMTRY1 6 -1.000000 0.000000 0.000000 27.60400 REMARK 290 SMTRY2 6 0.000000 -1.000000 0.000000 56.12750 REMARK 290 SMTRY3 6 0.000000 0.000000 1.000000 72.14000 REMARK 290 SMTRY1 7 -1.000000 0.000000 0.000000 27.60400 REMARK 290 SMTRY2 7 0.000000 1.000000 0.000000 56.12750 REMARK 290 SMTRY3 7 0.000000 0.000000 -1.000000 72.14000 REMARK 290 SMTRY1 8 1.000000 0.000000 0.000000 27.60400 REMARK 290 SMTRY2 8 0.000000 -1.000000 0.000000 56.12750 REMARK 290 SMTRY3 8 0.000000 0.000000 -1.000000 0.00000 REMARK 290 REMARK 290 REMARK: NULL

REMARK 300 REMARK 300 BIOMOLECULE: 1 REMARK 300 SEE REMARK 350 FOR THE AUTHOR PROVIDED AND/OR PROGRAM REMARK 300 GENERATED ASSEMBLY INFORMATION FOR THE STRUCTURE IN REMARK 300 THIS ENTRY. THE REMARK MAY ALSO PROVIDE INFORMATION ON REMARK 300 BURIED SURFACE AREA. REMARK 300 REMARK 300 DETAILS:THE BIOMOLECULE CONSISTS OF A HOMO- REMARK 300 TETRAMERIC COMPLEXOF BIOPOLYMERSSUBUNITS C AND D OF REMARK 300 THE HGPRT HOMOTETRAMER ARE GENERATEDBY ROTATION OF REMARK 300 SUBUNITS A AND B ABOUT THECRYSTALLOGRAPHIC 2- REMARK 300 FOLD AXIS PARALLEL TO B.

REMARK 350 REMARK 350 GENERATING THE BIOMOLECULE REMARK 350 COORDINATES FOR A COMPLETE MULTIMER REPRESENTING THE KNOWN REMARK 350 BIOLOGICALLY SIGNIFICANT OLIGOMERIZATION STATE OF THE REMARK 350 MOLECULE CAN BE GENERATED BY APPLYING BIOMT TRANSFORMATIONS REMARK 350 GIVEN BELOW. BOTH NON-CRYSTALLOGRAPHIC AND REMARK 350 CRYSTALLOGRAPHIC OPERATIONS ARE GIVEN. REMARK 350 REMARK 350 BIOMOLECULE: 1 REMARK 350 SOFTWARE DETERMINED QUATERNARY STRUCTURE: TETRAMERIC REMARK 350 SOFTWARE USED: PQS REMARK 350 TOTAL BURIED SURFACE AREA: 11590 ANGSTROM**2 REMARK 350 SURFACE AREA OF THE COMPLEX: 38570 ANGSTROM**2 REMARK 350 CHANGE IN SOLVENT FREE ENERGY: -73.9 KCAL/MOL REMARK 350 APPLY THE FOLLOWING TO CHAINS: A, B REMARK 350 BIOMT1 1 1.000000 0.000000 0.000000 0.00000 REMARK 350 BIOMT2 1 0.000000 1.000000 0.000000 0.00000 REMARK 350 BIOMT3 1 0.000000 0.000000 1.000000 0.00000 REMARK 350 BIOMT1 2 -1.000000 0.000000 0.000000 55.21000 REMARK 350 BIOMT2 2 0.000000 1.000000 0.000000 0.00000 REMARK 350 BIOMT3 2 0.000000 0.000000 -1.000000 72.14000

REMARK 465 REMARK 465 MISSING RESIDUES REMARK 465 THE FOLLOWING RESIDUES WERE NOT LOCATED IN THE REMARK 465 EXPERIMENT. (M=MODEL NUMBER; RES=RESIDUE NAME; C=CHAIN REMARK 465 IDENTIFIER; SSSEQ=SEQUENCE NUMBER; I=INSERTION CODE): REMARK 465 REMARK 465 M RES C SSSEQI REMARK 465 GLY A 0A REMARK 465 SER A 0B REMARK 465 HIS A 0C REMARK 465 SER A 117 REMARK 465 TYR A 118 REMARK 465 GLN A 119 REMARK 465 ASN A 120 REMARK 465 ASP A 121 REMARK 465 ASN A 122 REMARK 465 SER A 123 REMARK 465 THR A 124 REMARK 465 GLY A 125 REMARK 465 GLN A 126 REMARK 465 LEU A 127 REMARK 465 ASP A 181 REMARK 465 ARG A 182 REMARK 465 SER A 183 REMARK 465 ASN A 184 REMARK 465 GLY B 0A REMARK 465 SER B 0B REMARK 465 HIS B 0C REMARK 465 SER B 117 REMARK 465 TYR B 118 REMARK 465 GLN B 119 REMARK 465 ASN B 120 REMARK 465 ASP B 121 REMARK 465 ASN B 122 REMARK 465 SER B 123 REMARK 465 THR B 124 REMARK 465 GLY B 125 REMARK 465 ASP B 181 REMARK 465 ARG B 182 REMARK 465 SER B 183 REMARK 465 ASN B 184

REMARK 470 REMARK 470 MISSING ATOM REMARK 470 THE FOLLOWING RESIDUES HAVE MISSING ATOMS (M=MODEL NUMBER; REMARK 470 RES=RESIDUE NAME; C=CHAIN IDENTIFIER; SSEQ=SEQUENCE NUMBER; REMARK 470 I=INSERTION CODE): REMARK 470 M RES CSSEQI ATOMS REMARK 470 THR A 128 OG1 CG2 REMARK 470 LYS A 226 CG CD CE NZ REMARK 470 LYS A 230 CG CD CE NZ REMARK 470 MET B 1 CG SD CE REMARK 470 GLN B 126 CG CD OE1 NE2 REMARK 470 GLU B 229 CG CD OE1 OE2 REMARK 470 LYS B 230 CG CD CE NZ

REMARK 500 REMARK 500 GEOMETRY AND STEREOCHEMISTRY REMARK 500 SUBTOPIC: COVALENT BOND ANGLES REMARK 500 REMARK 500 THE STEREOCHEMICAL PARAMETERS OF THE FOLLOWING RESIDUES REMARK 500 HAVE VALUES WHICH DEVIATE FROM EXPECTED VALUES BY MORE REMARK 500 THAN 6*RMSD (M=MODEL NUMBER; RES=RESIDUE NAME; C=CHAIN REMARK 500 IDENTIFIER; SSEQ=SEQUENCE NUMBER; I=INSERTION CODE). REMARK 500 REMARK 500 STANDARD TABLE: REMARK 500 FORMAT: (10X,I3,1X,A3,1X,A1,I4,A1,3(1X,A4,2X),12X,F5.1) REMARK 500 REMARK 500 EXPECTED VALUES PROTEIN: ENGH AND HUBER, 1999 REMARK 500 EXPECTED VALUES NUCLEIC ACID: CLOWNEY ET AL 1996 REMARK 500 REMARK 500 M RES CSSEQI ATM1 ATM2 ATM3 REMARK 500 ASP A 23 CB - CG - OD2 ANGL. DEV. = 7.1 DEGREES REMARK 500 ASP A 43 CB - CG - OD2 ANGL. DEV. = -6.4 DEGREES REMARK 500 ARG A 55 CD - NE - CZ ANGL. DEV. = 9.1 DEGREES REMARK 500 ARG A 55 CG - CD - NE ANGL. DEV. = -16.5 DEGREES REMARK 500 ARG A 55 NE - CZ - NH2 ANGL. DEV. = -3.9 DEGREES REMARK 500 ARG A 101 NE - CZ - NH1 ANGL. DEV. = 3.6 DEGREES REMARK 500 ASP A 133 CB - CG - OD2 ANGL. DEV. = -8.8 DEGREES REMARK 500 ASP A 139 CB - CG - OD2 ANGL. DEV. = -6.1 DEGREES REMARK 500 ASP A 147 CB - CG - OD1 ANGL. DEV. = 6.9 DEGREES REMARK 500 ARG A 161 CD - NE - CZ ANGL. DEV. = 9.8 DEGREES REMARK 500 ARG A 161 NE - CZ - NH1 ANGL. DEV. = 3.3 DEGREES REMARK 500 ARG A 171 NE - CZ - NH1 ANGL. DEV. = 4.0 DEGREES REMARK 500 ARG A 171 NE - CZ - NH2 ANGL. DEV. = -4.5 DEGREES REMARK 500 ARG A 171 O - C - N ANGL. DEV. = 9.9 DEGREES REMARK 500 SER A 185 CA - C - O ANGL. DEV. = 12.9 DEGREES REMARK 500 ASP A 206 CB - CG - OD2 ANGL. DEV. = 6.0 DEGREES REMARK 500 TYR B 9 CB - CG - CD1 ANGL. DEV. = -4.3 DEGREES REMARK 500 TYR B 9 CB - CG - CD2 ANGL. DEV. = 4.9 DEGREES REMARK 500 ASP B 23 CB - CG - OD1 ANGL. DEV. = 9.0 DEGREES REMARK 500 PHE B 32 CB - CG - CD1 ANGL. DEV. = 6.0 DEGREES REMARK 500 ILE B 45 O - C - N ANGL. DEV. = -9.9 DEGREES REMARK 500 ARG B 55 CD - NE - CZ ANGL. DEV. = 12.9 DEGREES REMARK 500 ARG B 55 NE - CZ - NH1 ANGL. DEV. = 4.0 DEGREES REMARK 500 ARG B 65 NE - CZ - NH1 ANGL. DEV. = 3.7 DEGREES REMARK 500 ARG B 82 CD - NE - CZ ANGL. DEV. = 36.7 DEGREES REMARK 500 ARG B 82 CG - CD - NE ANGL. DEV. = 20.6 DEGREES REMARK 500 ARG B 82 NE - CZ - NH1 ANGL. DEV. = -3.8 DEGREES REMARK 500 ARG B 82 NE - CZ - NH2 ANGL. DEV. = 6.8 DEGREES REMARK 500 ARG B 101 NE - CZ - NH1 ANGL. DEV. = 4.9 DEGREES REMARK 500 ARG B 101 NE - CZ - NH2 ANGL. DEV. = -5.3 DEGREES REMARK 500 ARG B 114 NE - CZ - NH1 ANGL. DEV. = -4.1 DEGREES REMARK 500 ARG B 114 NE - CZ - NH2 ANGL. DEV. = -3.1 DEGREES REMARK 500 ARG B 114 NH1 - CZ - NH2 ANGL. DEV. = 7.0 DEGREES REMARK 500 ARG B 138 NE - CZ - NH1 ANGL. DEV. = 3.2 DEGREES REMARK 500 ASP B 147 CB - CG - OD1 ANGL. DEV. = 6.0 DEGREES REMARK 500 ARG B 161 NE - CZ - NH1 ANGL. DEV. = -3.1 DEGREES REMARK 500 ARG B 171 CD - NE - CZ ANGL. DEV. = 11.9 DEGREES REMARK 500 ARG B 171 NE - CZ - NH1 ANGL. DEV. = 9.4 DEGREES REMARK 500 ARG B 171 NE - CZ - NH2 ANGL. DEV. = -4.0 DEGREES REMARK 500 ASP B 197 CB - CG - OD2 ANGL. DEV. = -5.5 DEGREES REMARK 500 ASP B 206 O - C - N ANGL. DEV. = 9.7 DEGREES REMARK 500 ARG B 212 NE - CZ - NH1 ANGL. DEV. = 13.4 DEGREES REMARK 500 ARG B 212 NE - CZ - NH2 ANGL. DEV. = -6.1 DEGREES REMARK 500 ARG B 212 NH1 - CZ - NH2 ANGL. DEV. = -7.3 DEGREES REMARK 500 ASP B 222 CB - CG - OD1 ANGL. DEV. = 6.7 DEGREES REMARK 500 REMARK 500 REMARK: NULL REMARK 500 REMARK 500 GEOMETRY AND STEREOCHEMISTRY REMARK 500 SUBTOPIC: TORSION ANGLES REMARK 500 REMARK 500 TORSION ANGLES OUTSIDE THE EXPECTED RAMACHANDRAN REGIONS: REMARK 500 (M=MODEL NUMBER; RES=RESIDUE NAME; C=CHAIN IDENTIFIER; REMARK 500 SSEQ=SEQUENCE NUMBER; I=INSERTION CODE). REMARK 500 STANDARD TABLE: REMARK 500 FORMAT:(10X,I3,1X,A3,1X,A1,I4,A1,4X,F7.2,3X,F7.2) REMARK 500 REMARK 500 EXPECTED VALUES: GJ KLEYWEGT AND TA JONES (1996). PHI/PSI- REMARK 500 CHOLOGY: RAMACHANDRAN REVISITED. STRUCTURE 4, 1395 - 1400 REMARK 500 REMARK 500 M RES CSSEQI PSI PHI REMARK 500 ALA A 150 -87.04 -123.67 REMARK 500 CYS A 204 -9.42 80.66 REMARK 500 GLU A 209 -3.05 76.73 REMARK 500 LYS B 4 116.38 -162.44 REMARK 500 ALA B 150 -85.99 -123.46 REMARK 500 CYS B 204 -16.14 84.69 REMARK 500 GLU B 209 -6.49 79.36 REMARK 500 PHE B 211 -3.17 83.58 REMARK 500 REMARK 500 REMARK: NULL REMARK 500 REMARK 500 GEOMETRY AND STEREOCHEMISTRY REMARK 500 SUBTOPIC: MAIN CHAIN PLANARITY REMARK 500 REMARK 500 THE FOLLOWING RESIDUES HAVE A PSEUDO PLANARITY REMARK 500 TORSION, C(I) - CA(I) - N(I+1) - O(I), GREATER REMARK 500 10.0 DEGREES. (M=MODEL NUMBER; RES=RESIDUE NAME; REMARK 500 C=CHAIN IDENTIFIER; SSEQ=SEQUENCE NUMBER; REMARK 500 I=INSERTION CODE). REMARK 500 REMARK 500 M RES CSSEQI ANGLE REMARK 500 ILE A 195 -11.01 REMARK 500 REMARK 500 REMARK: NULL

REMARK 525 REMARK 525 SOLVENT REMARK 525 REMARK 525 THE SOLVENT MOLECULES HAVE CHAIN IDENTIFIERS THAT REMARK 525 INDICATE THE POLYMER CHAIN WITH WHICH THEY ARE MOST REMARK 525 CLOSELY ASSOCIATED. THE REMARK LISTS ALL THE SOLVENT REMARK 525 MOLECULES WHICH ARE MORE THAN 5A AWAY FROM THE REMARK 525 NEAREST POLYMER CHAIN (M = MODEL NUMBER; REMARK 525 RES=RESIDUE NAME; C=CHAIN IDENTIFIER; SSEQ=SEQUENCE REMARK 525 NUMBER; I=INSERTION CODE):

REMARK 620 REMARK 620 METAL COORDINATION REMARK 620 (M=MODEL NUMBER; RES=RESIDUE NAME; C=CHAIN IDENTIFIER; REMARK 620 SSEQ=SEQUENCE NUMBER; I=INSERTION CODE): REMARK 620 REMARK 620 COORDINATION ANGLES FOR: M RES CSSEQI METAL REMARK 620 MG A 302 MG REMARK 620 N RES CSSEQI ATOM REMARK 620 1 HOH A2099 O REMARK 620 2 POP A 301 O1 95.2 REMARK 620 3 POP A 301 O4 164.1 100.4 REMARK 620 4 HOH A2065 O 80.9 165.1 83.2 REMARK 620 5 HOH A2062 O 97.2 84.4 81.6 81.8 REMARK 620 N 1 2 3 4 REMARK 620 REMARK 620 COORDINATION ANGLES FOR: M RES CSSEQI METAL REMARK 620 MG A 303 MG REMARK 620 N RES CSSEQI ATOM REMARK 620 1 HOH A2102 O REMARK 620 2 POP A 301 O2 82.0 REMARK 620 3 POP A 301 O5 88.6 95.2 REMARK 620 4 ASP A 206 OD1 91.2 169.0 93.4 REMARK 620 5 HOH A2083 O 91.7 87.6 177.2 83.8 REMARK 620 6 HOH A2084 O 176.2 94.3 92.6 92.3 87.2 REMARK 620 N 1 2 3 4 5 REMARK 620 REMARK 620 COORDINATION ANGLES FOR: M RES CSSEQI METAL REMARK 620 MG B 302 MG REMARK 620 N RES CSSEQI ATOM REMARK 620 1 POP B 301 O4 REMARK 620 2 POP B 301 O1 97.4 REMARK 620 3 HOH B2053 O 86.9 172.5 REMARK 620 4 HOH B2049 O 89.1 95.5 90.8 REMARK 620 5 HOH B2054 O 171.7 89.2 87.1 85.3 REMARK 620 6 HOH B2077 O 91.1 90.3 83.5 174.2 93.9 REMARK 620 N 1 2 3 4 5 REMARK 620 REMARK 620 COORDINATION ANGLES FOR: M RES CSSEQI METAL REMARK 620 MG B 303 MG REMARK 620 N RES CSSEQI ATOM REMARK 620 1 HOH B2063 O REMARK 620 2 POP B 301 O5 85.7 REMARK 620 3 ASP B 206 OD1 81.0 87.7 REMARK 620 4 POP B 301 O2 93.8 104.2 166.7 REMARK 620 5 HOH B2064 O 83.7 165.2 80.5 86.8 REMARK 620 6 HOH B2078 O 176.3 95.4 95.5 89.4 94.6 REMARK 620 N 1 2 3 4 5

REMARK 800 REMARK 800 SITE REMARK 800 SITE_IDENTIFIER: AC1 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE MG A 302 REMARK 800 REMARK 800 SITE_IDENTIFIER: AC2 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE MG A 303 REMARK 800 REMARK 800 SITE_IDENTIFIER: AC3 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE MG B 302 REMARK 800 REMARK 800 SITE_IDENTIFIER: AC4 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE MG B 303 REMARK 800 REMARK 800 SITE_IDENTIFIER: AC5 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE XMP A 300 REMARK 800 REMARK 800 SITE_IDENTIFIER: AC6 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE POP A 301 REMARK 800 REMARK 800 SITE_IDENTIFIER: AC7 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE XMP B 300 REMARK 800 REMARK 800 SITE_IDENTIFIER: AC8 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE POP B 301

REMARK 900 REMARK 900 RELATED ENTRIES REMARK 900 RELATED ID: 1DBR RELATED DB: PDB REMARK 900 HYPOXANTHINE GUANINE XANTHINE REMARK 900 RELATED ID: 1HMP RELATED DB: PDB REMARK 900 HYPOXANTHINE GUANINE PHOSPHORIBOSYLTRANSFERASE REMARK 900 RELATED ID: 1QK3 RELATED DB: PDB REMARK 900 HYPOXANTHINE GUANINE PHOSPHORIBOSYLTRANSFERASE REMARK 900 RELATED ID: 1QK4 RELATED DB: PDB REMARK 900 HYPOXANTHINE GUANINE PHOSPHORIBOSYLTRANSFERASE

DBREF 1QK5 A 1 230 UNP Q26997 HGXR_TOXGO 1 230 DBREF 1QK5 B 1 230 UNP Q26997 HGXR_TOXGO 1 230

SEQADV 1QK5 GLY A 0A UNP Q26997 CLONING ARTIFACT SEQADV 1QK5 SER A 0B UNP Q26997 CLONING ARTIFACT SEQADV 1QK5 HIS A 0C UNP Q26997 CLONING ARTIFACT SEQADV 1QK5 GLY B 0A UNP Q26997 CLONING ARTIFACT SEQADV 1QK5 SER B 0B UNP Q26997 CLONING ARTIFACT SEQADV 1QK5 HIS B 0C UNP Q26997 CLONING ARTIFACT SEQADV 1QK5 ALA A 150 UNP Q26997 ASP 150 ENGINEERED MUTATION SEQADV 1QK5 ALA B 150 UNP Q26997 ASP 150 ENGINEERED MUTATION

SEQRES 1 A 233 GLY SER HIS MET ALA SER LYS PRO ILE GLU ASP TYR GLY SEQRES 2 A 233 LYS GLY LYS GLY ARG ILE GLU PRO MET TYR ILE PRO ASP SEQRES 3 A 233 ASN THR PHE TYR ASN ALA ASP ASP PHE LEU VAL PRO PRO SEQRES 4 A 233 HIS CYS LYS PRO TYR ILE ASP LYS ILE LEU LEU PRO GLY SEQRES 5 A 233 GLY LEU VAL LYS ASP ARG VAL GLU LYS LEU ALA TYR ASP SEQRES 6 A 233 ILE HIS ARG THR TYR PHE GLY GLU GLU LEU HIS ILE ILE SEQRES 7 A 233 CYS ILE LEU LYS GLY SER ARG GLY PHE PHE ASN LEU LEU SEQRES 8 A 233 ILE ASP TYR LEU ALA THR ILE GLN LYS TYR SER GLY ARG SEQRES 9 A 233 GLU SER SER VAL PRO PRO PHE PHE GLU HIS TYR VAL ARG SEQRES 10 A 233 LEU LYS SER TYR GLN ASN ASP ASN SER THR GLY GLN LEU SEQRES 11 A 233 THR VAL LEU SER ASP ASP LEU SER ILE PHE ARG ASP LYS SEQRES 12 A 233 HIS VAL LEU ILE VAL GLU ASP ILE VAL ALA THR GLY PHE SEQRES 13 A 233 THR LEU THR GLU PHE GLY GLU ARG LEU LYS ALA VAL GLY SEQRES 14 A 233 PRO LYS SER MET ARG ILE ALA THR LEU VAL GLU LYS ARG SEQRES 15 A 233 THR ASP ARG SER ASN SER LEU LYS GLY ASP PHE VAL GLY SEQRES 16 A 233 PHE SER ILE GLU ASP VAL TRP ILE VAL GLY CYS CYS TYR SEQRES 17 A 233 ASP PHE ASN GLU MET PHE ARG ASP PHE ASP HIS VAL ALA SEQRES 18 A 233 VAL LEU SER ASP ALA ALA ARG LYS LYS PHE GLU LYS SEQRES 1 B 233 GLY SER HIS MET ALA SER LYS PRO ILE GLU ASP TYR GLY SEQRES 2 B 233 LYS GLY LYS GLY ARG ILE GLU PRO MET TYR ILE PRO ASP SEQRES 3 B 233 ASN THR PHE TYR ASN ALA ASP ASP PHE LEU VAL PRO PRO SEQRES 4 B 233 HIS CYS LYS PRO TYR ILE ASP LYS ILE LEU LEU PRO GLY SEQRES 5 B 233 GLY LEU VAL LYS ASP ARG VAL GLU LYS LEU ALA TYR ASP SEQRES 6 B 233 ILE HIS ARG THR TYR PHE GLY GLU GLU LEU HIS ILE ILE SEQRES 7 B 233 CYS ILE LEU LYS GLY SER ARG GLY PHE PHE ASN LEU LEU SEQRES 8 B 233 ILE ASP TYR LEU ALA THR ILE GLN LYS TYR SER GLY ARG SEQRES 9 B 233 GLU SER SER VAL PRO PRO PHE PHE GLU HIS TYR VAL ARG SEQRES 10 B 233 LEU LYS SER TYR GLN ASN ASP ASN SER THR GLY GLN LEU SEQRES 11 B 233 THR VAL LEU SER ASP ASP LEU SER ILE PHE ARG ASP LYS SEQRES 12 B 233 HIS VAL LEU ILE VAL GLU ASP ILE VAL ALA THR GLY PHE SEQRES 13 B 233 THR LEU THR GLU PHE GLY GLU ARG LEU LYS ALA VAL GLY SEQRES 14 B 233 PRO LYS SER MET ARG ILE ALA THR LEU VAL GLU LYS ARG SEQRES 15 B 233 THR ASP ARG SER ASN SER LEU LYS GLY ASP PHE VAL GLY SEQRES 16 B 233 PHE SER ILE GLU ASP VAL TRP ILE VAL GLY CYS CYS TYR SEQRES 17 B 233 ASP PHE ASN GLU MET PHE ARG ASP PHE ASP HIS VAL ALA SEQRES 18 B 233 VAL LEU SER ASP ALA ALA ARG LYS LYS PHE GLU LYS

HET MG A 302 1 HET MG A 303 1 HET MG B 302 1 HET MG B 303 1 HET XMP A 300 24 HET POP A 301 9 HET XMP B 300 24 HET POP B 301 9

HETNAM MG MAGNESIUM ION HETNAM XMP XANTHOSINE-5'-MONOPHOSPHATE HETNAM POP PYROPHOSPHATE 2-

FORMUL 3 MG 4(MG 2+) FORMUL 7 XMP 2(C10 H14 N4 O9 P 1+) FORMUL 8 POP 2(H2 O7 P2 2-) FORMUL 11 HOH *182(H2 O1)

HELIX 1 1 PRO A 5 TYR A 9 5 5 HELIX 2 2 ASP A 30 PHE A 32 5 3 HELIX 3 3 PRO A 48 PHE A 68 1 21 HELIX 4 4 SER A 81 SER A 99 1 19 HELIX 5 5 ASP A 133 ARG A 138 5 6 HELIX 6 6 GLY A 152 ALA A 164 1 13 HELIX 7 7 SER A 221 GLU A 229 1 9 HELIX 8 8 PRO B 5 TYR B 9 5 5 HELIX 9 9 ASP B 30 PHE B 32 5 3 HELIX 10 10 CYS B 38 ILE B 42 5 5 HELIX 11 11 PRO B 48 PHE B 68 1 21 HELIX 12 12 SER B 81 SER B 99 1 19 HELIX 13 13 ASP B 133 ARG B 138 5 6 HELIX 14 14 GLY B 152 GLY B 166 1 15 HELIX 15 15 SER B 221 PHE B 228 1 8

SHEET 1 A 4 PHE A 109 ARG A 114 0 SHEET 2 A 4 HIS A 73 LEU A 78 1 N ILE A 74 O PHE A 109 SHEET 3 A 4 HIS A 141 GLU A 146 1 N LEU A 143 O HIS A 73 SHEET 4 A 4 SER A 169 THR A 174 1 N SER A 169 O VAL A 142 SHEET 1 B 2 VAL A 176 LYS A 178 0 SHEET 2 B 2 PHE A 193 ILE A 195 1 N PHE A 193 O GLU A 177 SHEET 1 C 5 THR B 128 SER B 131 0 SHEET 2 C 5 PHE B 109 LYS B 116 -1 N LYS B 116 O THR B 128 SHEET 3 C 5 LEU B 72 LEU B 78 1 N ILE B 74 O PHE B 109 SHEET 4 C 5 HIS B 141 GLU B 146 1 N HIS B 141 O HIS B 73 SHEET 5 C 5 SER B 169 THR B 174 1 N SER B 169 O VAL B 142 SHEET 1 D 2 VAL B 176 LYS B 178 0 SHEET 2 D 2 PHE B 193 ILE B 195 1 N PHE B 193 O GLU B 177

LINK MG MG A 302 O HOH A2099 1555 1555 2.16 LINK MG MG A 302 O1 POP A 301 1555 1555 2.06 LINK MG MG A 302 O4 POP A 301 1555 1555 2.09 LINK MG MG A 302 O HOH A2065 1555 1555 2.26 LINK MG MG A 302 O HOH A2062 1555 1555 2.38 LINK MG MG A 303 O HOH A2102 1555 1555 2.16 LINK MG MG A 303 O2 POP A 301 1555 1555 2.36 LINK MG MG A 303 O5 POP A 301 1555 1555 2.09 LINK MG MG A 303 OD1 ASP A 206 1555 1555 2.13 LINK MG MG A 303 O HOH A2083 1555 1555 2.23 LINK MG MG A 303 O HOH A2084 1555 1555 2.02 LINK O5 POP B 301 MG MG B 303 1555 1555 2.00 LINK MG MG B 302 O HOH B2053 1555 1555 2.25 LINK MG MG B 302 O HOH B2049 1555 1555 2.14 LINK MG MG B 302 O HOH B2054 1555 1555 2.24 LINK MG MG B 302 O HOH B2077 1555 1555 2.08 LINK MG MG B 302 O1 POP B 301 1555 1555 2.09 LINK MG MG B 302 O4 POP B 301 1555 1555 2.24 LINK MG MG B 303 OD1 ASP B 206 1555 1555 2.25 LINK MG MG B 303 O2 POP B 301 1555 1555 2.31 LINK MG MG B 303 O HOH B2064 1555 1555 2.30 LINK MG MG B 303 O HOH B2078 1555 1555 2.29 LINK MG MG B 303 O HOH B2063 1555 1555 2.40

CISPEP 1 LEU A 78 LYS A 79 0 -2.90 CISPEP 2 LEU B 78 LYS B 79 0 -8.25

SITE 1 AC1 5 XMP A 300 POP A 301 HOH A2062 HOH A2065 SITE 2 AC1 5 HOH A2099 SITE 1 AC2 5 ASP A 206 POP A 301 HOH A2083 HOH A2084 SITE 2 AC2 5 HOH A2102 SITE 1 AC3 5 POP B 301 HOH B2049 HOH B2053 HOH B2054 SITE 2 AC3 5 HOH B2077 SITE 1 AC4 5 ASP B 206 POP B 301 HOH B2063 HOH B2064 SITE 2 AC4 5 HOH B2078 SITE 1 AC5 19 ASP A 147 ILE A 148 ALA A 150 THR A 151 SITE 2 AC5 19 GLY A 152 PHE A 153 THR A 154 LYS A 178 SITE 3 AC5 19 TRP A 199 ILE A 200 TYR A 205 ASP A 206 SITE 4 AC5 19 POP A 301 MG A 302 HOH A2097 HOH A2098 SITE 5 AC5 19 HOH A2099 HOH A2100 HOH A2102 SITE 1 AC6 16 LYS A 79 GLY A 80 ARG A 114 LYS A 116 SITE 2 AC6 16 ASP A 206 ARG A 212 XMP A 300 MG A 302 SITE 3 AC6 16 MG A 303 HOH A2062 HOH A2065 HOH A2084 SITE 4 AC6 16 HOH A2086 HOH A2098 HOH A2101 HOH A2102 SITE 1 AC7 17 ASP B 147 ILE B 148 ALA B 150 THR B 151 SITE 2 AC7 17 GLY B 152 PHE B 153 THR B 154 LYS B 178 SITE 3 AC7 17 VAL B 198 TRP B 199 ILE B 200 TYR B 205 SITE 4 AC7 17 ASP B 206 POP B 301 HOH B2076 HOH B2077 SITE 5 AC7 17 HOH B2078 SITE 1 AC8 16 LYS B 79 GLY B 80 ARG B 114 LYS B 116 SITE 2 AC8 16 ASP B 206 ARG B 212 XMP B 300 MG B 302 SITE 3 AC8 16 MG B 303 HOH B2049 HOH B2053 HOH B2054 SITE 4 AC8 16 HOH B2063 HOH B2077 HOH B2079 HOH B2080

CRYST1 55.208 112.255 144.280 90.00 90.00 90.00 C 2 2 21 16

ORIGX1 1.000000 0.000000 0.000000 0.00000

ORIGX2 0.000000 1.000000 0.000000 0.00000

ORIGX3 0.000000 0.000000 1.000000 0.00000

SCALE1 0.018113 0.000000 0.000000 0.00000

SCALE2 0.000000 0.008908 0.000000 0.00000

SCALE3 0.000000 0.000000 0.006931 0.00000

MTRIX1 1 -0.951065 0.000778 -0.308991 65.00050 1

MTRIX2 1 -0.001881 -0.999993 0.003272 51.21940 1

MTRIX3 1 -0.308986 0.003693 0.951059 10.23740 1