2IZB - Header Asymmetric Unit

HEADER BIOTIN-BINDING PROTEIN 13-AUG-97 2IZB

TITLE APOSTREPTAVIDIN PH 3.12 I4122 STRUCTURE

COMPND MOL_ID: 1; COMPND 2 MOLECULE: STREPTAVIDIN; COMPND 3 CHAIN: A

SOURCE MOL_ID: 1; SOURCE 2 ORGANISM_SCIENTIFIC: STREPTOMYCES AVIDINII; SOURCE 3 ORGANISM_TAXID: 1895

KEYWDS BIOTIN-BINDING PROTEIN, APOSTREPTAVIDIN

EXPDTA X-RAY DIFFRACTION

AUTHOR B.A.KATZ

REVDAT 5 08-FEB-17 2IZB 1 REMARK REVDAT 4 16-NOV-11 2IZB 1 HETATM REVDAT 3 13-JUL-11 2IZB 1 VERSN REVDAT 2 24-FEB-09 2IZB 1 VERSN REVDAT 1 16-SEP-98 2IZB 0

JRNL AUTH B.A.KATZ JRNL TITL BINDING OF BIOTIN TO STREPTAVIDIN STABILIZES INTERSUBUNIT JRNL TITL 2 SALT BRIDGES BETWEEN ASP61 AND HIS87 AT LOW PH. JRNL REF J.MOL.BIOL. V. 274 776 1997 JRNL REFN ISSN 0022-2836 JRNL PMID 9405158 JRNL DOI 10.1006/JMBI.1997.1444

REMARK 1 REMARK 1 REFERENCE 1 REMARK 1 AUTH B.A.KATZ,R.T.CASS REMARK 1 TITL IN CRYSTALS OF COMPLEXES OF STREPTAVIDIN WITH PEPTIDE REMARK 1 TITL 2 LIGANDS CONTAINING THE HPQ SEQUENCE THE PKA OF THE PEPTIDE REMARK 1 TITL 3 HISTIDINE IS LESS THAN 3.0 REMARK 1 REF J.BIOL.CHEM. V. 272 13220 1997 REMARK 1 REFN ISSN 0021-9258 REMARK 1 REFERENCE 2 REMARK 1 AUTH B.A.KATZ,B.LIU,R.T.CASS REMARK 1 TITL STRUCTURE-BASED DESIGN TOOLS: STRUCTURAL AND THERMODYNAMIC REMARK 1 TITL 2 COMPARISON WITH BIOTIN OF A SMALL MOLECULE THAT BINDS TO REMARK 1 TITL 3 STREPTAVIDIN WITH MICROMOLAR AFFINITY REMARK 1 REF J.AM.CHEM.SOC. V. 118 7914 1996 REMARK 1 REFN ISSN 0002-7863 REMARK 1 REFERENCE 3 REMARK 1 AUTH B.A.KATZ REMARK 1 TITL PREPARATION OF A PROTEIN-DIMERIZING LIGAND BY TOPOCHEMISTRY REMARK 1 TITL 2 AND STRUCTURE-BASED DESIGN REMARK 1 REF J.AM.CHEM.SOC. V. 118 2535 1996 REMARK 1 REFN ISSN 0002-7863 REMARK 1 REFERENCE 4 REMARK 1 AUTH B.A.KATZ,R.T.CASS,B.LIU,R.ARZE,N.COLLINS REMARK 1 TITL TOPOCHEMICAL CATALYSIS ACHIEVED BY STRUCTURE-BASED LIGAND REMARK 1 TITL 2 DESIGN. REMARK 1 REF J.BIOL.CHEM. V. 270 31210 1995 REMARK 1 REFN ISSN 0021-9258 REMARK 1 PMID 8537386 REMARK 1 REFERENCE 5 REMARK 1 AUTH B.A.KATZ REMARK 1 TITL BINDING TO PROTEIN TARGETS OF PEPTIDIC LEADS DISCOVERED BY REMARK 1 TITL 2 PHAGE DISPLAY: CRYSTAL STRUCTURES OF STREPTAVIDIN-BOUND REMARK 1 TITL 3 LINEAR AND CYCLIC PEPTIDE LIGANDS CONTAINING THE HPQ REMARK 1 TITL 4 SEQUENCE REMARK 1 REF BIOCHEMISTRY V. 34 15421 1995 REMARK 1 REFN ISSN 0006-2960 REMARK 1 REFERENCE 6 REMARK 1 AUTH B.A.KATZ,C.R.JOHNSON,R.T.CASS REMARK 1 TITL STRUCTURE-BASED DESIGN OF HIGH AFFINITY STREPTAVIDIN BINDING REMARK 1 TITL 2 LIGANDS CONTAINING THIOETHER CROSSLINKS REMARK 1 REF J.AM.CHEM.SOC. V. 117 8541 1995 REMARK 1 REFN ISSN 0002-7863

REMARK 2 REMARK 2 RESOLUTION. 1.20 ANGSTROMS.

REMARK 3 REMARK 3 REFINEMENT. REMARK 3 PROGRAM : X-PLOR REMARK 3 AUTHORS : BRUNGER REMARK 3 REMARK 3 DATA USED IN REFINEMENT. REMARK 3 RESOLUTION RANGE HIGH (ANGSTROMS) : 1.20 REMARK 3 RESOLUTION RANGE LOW (ANGSTROMS) : 7.50 REMARK 3 DATA CUTOFF (SIGMA(F)) : 1.800 REMARK 3 DATA CUTOFF HIGH (ABS(F)) : NULL REMARK 3 DATA CUTOFF LOW (ABS(F)) : NULL REMARK 3 COMPLETENESS (WORKING+TEST) (%) : 77.0 REMARK 3 NUMBER OF REFLECTIONS : 22033 REMARK 3 REMARK 3 FIT TO DATA USED IN REFINEMENT. REMARK 3 CROSS-VALIDATION METHOD : FREE R REMARK 3 FREE R VALUE TEST SET SELECTION : NULL REMARK 3 R VALUE (WORKING SET) : 0.207 REMARK 3 FREE R VALUE : 0.235 REMARK 3 FREE R VALUE TEST SET SIZE (%) : 10.000 REMARK 3 FREE R VALUE TEST SET COUNT : NULL REMARK 3 ESTIMATED ERROR OF FREE R VALUE : NULL REMARK 3 REMARK 3 FIT IN THE HIGHEST RESOLUTION BIN. REMARK 3 TOTAL NUMBER OF BINS USED : NULL REMARK 3 BIN RESOLUTION RANGE HIGH (A) : 1.42 REMARK 3 BIN RESOLUTION RANGE LOW (A) : 1.48 REMARK 3 BIN COMPLETENESS (WORKING+TEST) (%) : 41.90 REMARK 3 REFLECTIONS IN BIN (WORKING SET) : NULL REMARK 3 BIN R VALUE (WORKING SET) : NULL REMARK 3 BIN FREE R VALUE : NULL REMARK 3 BIN FREE R VALUE TEST SET SIZE (%) : NULL REMARK 3 BIN FREE R VALUE TEST SET COUNT : NULL REMARK 3 ESTIMATED ERROR OF BIN FREE R VALUE : NULL REMARK 3 REMARK 3 NUMBER OF NON-HYDROGEN ATOMS USED IN REFINEMENT. REMARK 3 PROTEIN ATOMS : 911 REMARK 3 NUCLEIC ACID ATOMS : 0 REMARK 3 HETEROGEN ATOMS : 8 REMARK 3 SOLVENT ATOMS : 91 REMARK 3 REMARK 3 B VALUES. REMARK 3 FROM WILSON PLOT (A**2) : NULL REMARK 3 MEAN B VALUE (OVERALL, A**2) : NULL 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 COORDINATE ERROR. REMARK 3 ESD FROM LUZZATI PLOT (A) : NULL REMARK 3 ESD FROM SIGMAA (A) : NULL REMARK 3 LOW RESOLUTION CUTOFF (A) : NULL REMARK 3 REMARK 3 CROSS-VALIDATED ESTIMATED COORDINATE ERROR. REMARK 3 ESD FROM C-V LUZZATI PLOT (A) : NULL REMARK 3 ESD FROM C-V SIGMAA (A) : NULL REMARK 3 REMARK 3 RMS DEVIATIONS FROM IDEAL VALUES. REMARK 3 BOND LENGTHS (A) : 0.018 REMARK 3 BOND ANGLES (DEGREES) : 4.300 REMARK 3 DIHEDRAL ANGLES (DEGREES) : 24.500 REMARK 3 IMPROPER ANGLES (DEGREES) : NULL REMARK 3 REMARK 3 ISOTROPIC THERMAL MODEL : NULL REMARK 3 REMARK 3 ISOTROPIC THERMAL FACTOR RESTRAINTS. RMS SIGMA REMARK 3 MAIN-CHAIN BOND (A**2) : NULL ; NULL REMARK 3 MAIN-CHAIN ANGLE (A**2) : NULL ; NULL REMARK 3 SIDE-CHAIN BOND (A**2) : NULL ; NULL REMARK 3 SIDE-CHAIN ANGLE (A**2) : NULL ; NULL REMARK 3 REMARK 3 NCS MODEL : NULL REMARK 3 REMARK 3 NCS RESTRAINTS. RMS SIGMA/WEIGHT REMARK 3 GROUP 1 POSITIONAL (A) : NULL ; NULL REMARK 3 GROUP 1 B-FACTOR (A**2) : NULL ; NULL REMARK 3 REMARK 3 PARAMETER FILE 1 : PARMALLH3X.PRO REMARK 3 PARAMETER FILE 2 : NULL REMARK 3 PARAMETER FILE 3 : NULL REMARK 3 TOPOLOGY FILE 1 : TOPALLH6X_BAK.PRO REMARK 3 TOPOLOGY FILE 2 : NULL REMARK 3 TOPOLOGY FILE 3 : NULL REMARK 3 REMARK 3 OTHER REFINEMENT REMARKS: REMARK 3 THE FOLLOWING ATOMS HAD WEAK DENSITY AND OCCUPANCIES WERE REMARK 3 REFINED: ALA13, GLU14, ALA15, (MAIN CHAIN OF GLN24), (SIDE REMARK 3 CHAIN OF GLN24), (MAIN CHAIN OF LEU25), (SIDE CHAIN OF REMARK 3 LEU25), GLY26, (SIDE CHAIN OF ALA35), (CG, OD1, AND OD2 OF REMARK 3 ASP36), (CG, HG1, HG2, CD, OE1, OE2 OF GLU44), ALA46, REMARK 3 VAL47, GLY48, ASN49, ALA50, GLU51, (SIDE CHAIN OF SER52), REMARK 3 (NE, HE, CZ, NH1, HH11, HH12, NH2, HH21, HH22 OF ARG53), REMARK 3 (CG, HG1, HG2 OF ARG84), (CD, HD1, HD2, NE, HE, CZ NH1, REMARK 3 HH11, HH12, NH2, HH21, HH22 OF ARG84), GLY99, (MAIN CHAIN REMARK 3 OF ALA100), (CB, HB1, HB2, HB3 OF ALA100), (N, HN OF REMARK 3 GLU101), (CA, HA, CB, HB1, HB2 OF GLU101), (CG, HG1, HG2, REMARK 3 CD, OE1, OE2 OF GLU101), (NE, HE, CZ, NH1, HH11, HH12, NH2, REMARK 3 HH21, HH22 OF ARG103), (N, HN, CA, HA, CB, HB1, HB2, CG, REMARK 3 HG1, HG2, C, O OF GLU116), (CD, OE1, OE2 OF GLU116), REMARK 3 (ALA117), (SIDE CHAIN OF ASN118), (CG, HG1, HG2, CD, HD1, REMARK 3 HD2, CE, HE1, HE2, NZ, HZ1, HZ2, HZ3 OF LYS121), (CE, HE1, REMARK 3 HE2, NZ, HZ1, HZ2, HZ3 OF LYS132), (CE, HE1, HE2, NZ, HZ1, REMARK 3 HZ2, HZ3 OF LYS134). REMARK 3 REMARK 3 RESIDUES 60 - 69 WERE REFINED IN 2 CONFORMATIONS BECAUSE REMARK 3 UPON PROTONATION OF ASP61 AT LOW PH, ASP61 UNDERGOES A REMARK 3 LARGE SHIFT IN CONFORMATION AND CHANGE IN HYDROGEN BONDING. REMARK 3 THE LOOP COMRISING RESIDUES 61 - 69 ALSO UNDERGOES REMARK 3 CORRESPONDING CONFORMATIONAL CHANGES. HOWEVER SOME OF REMARK 3 THESE RESIDUES ARE DISORDERED AND NOT VISIBLE IN EITHER REMARK 3 CONFORMATION.

REMARK 4 REMARK 4 2IZB COMPLIES WITH FORMAT V. 3.30, 13-JUL-11

REMARK 100 REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY BNL.

REMARK 200 REMARK 200 EXPERIMENTAL DETAILS REMARK 200 EXPERIMENT TYPE : X-RAY DIFFRACTION REMARK 200 DATE OF DATA COLLECTION : NULL REMARK 200 TEMPERATURE (KELVIN) : NULL REMARK 200 PH : 3.12 REMARK 200 NUMBER OF CRYSTALS USED : 1 REMARK 200 REMARK 200 SYNCHROTRON (Y/N) : N REMARK 200 RADIATION SOURCE : ROTATING ANODE REMARK 200 BEAMLINE : NULL REMARK 200 X-RAY GENERATOR MODEL : RIGAKU RUH2R REMARK 200 MONOCHROMATIC OR LAUE (M/L) : M REMARK 200 WAVELENGTH OR RANGE (A) : 1.5418 REMARK 200 MONOCHROMATOR : NULL REMARK 200 OPTICS : MSC MIRRORS REMARK 200 REMARK 200 DETECTOR TYPE : IMAGE PLATE REMARK 200 DETECTOR MANUFACTURER : RIGAKU RAXIS IV REMARK 200 INTENSITY-INTEGRATION SOFTWARE : BIOTEX REMARK 200 DATA SCALING SOFTWARE : NULL REMARK 200 REMARK 200 NUMBER OF UNIQUE REFLECTIONS : 28447 REMARK 200 RESOLUTION RANGE HIGH (A) : NULL REMARK 200 RESOLUTION RANGE LOW (A) : NULL REMARK 200 REJECTION CRITERIA (SIGMA(I)) : NULL REMARK 200 REMARK 200 OVERALL. REMARK 200 COMPLETENESS FOR RANGE (%) : NULL REMARK 200 DATA REDUNDANCY : 5.400 REMARK 200 R MERGE (I) : 0.08200 REMARK 200 R SYM (I) : NULL REMARK 200 <I/SIGMA(I)> FOR THE DATA SET : NULL REMARK 200 REMARK 200 IN THE HIGHEST RESOLUTION SHELL. REMARK 200 HIGHEST RESOLUTION SHELL, RANGE HIGH (A) : NULL REMARK 200 HIGHEST RESOLUTION SHELL, RANGE LOW (A) : NULL REMARK 200 COMPLETENESS FOR SHELL (%) : NULL REMARK 200 DATA REDUNDANCY IN SHELL : NULL REMARK 200 R MERGE FOR SHELL (I) : NULL REMARK 200 R SYM FOR SHELL (I) : NULL REMARK 200 <I/SIGMA(I)> FOR SHELL : NULL REMARK 200 REMARK 200 DIFFRACTION PROTOCOL: NULL REMARK 200 METHOD USED TO DETERMINE THE STRUCTURE: NULL REMARK 200 SOFTWARE USED: X-PLOR REMARK 200 STARTING MODEL: NULL REMARK 200 REMARK 200 REMARK: REJECTION CRITERIA: (I(H)I - <I(H)I>) > [0.30 * (REMARK 200 I>) + 0.10*I(H)I], WHERE I(H)I IS THE ITH OBSERVATION OF THE REMARK 200 INTENSITY OF REFLECTION H (M.G.ROSSMANN ET AL., J.APPL.CRYST. 12, REMARK 200 570-581). THIS REJECTION CRITERION IS THE DEFAULT OF THE MSC REMARK 200 PROGRAM BIOTEX.

REMARK 280 REMARK 280 CRYSTAL REMARK 280 SOLVENT CONTENT, VS (%): 34.70 REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 2.87 REMARK 280 REMARK 280 CRYSTALLIZATION CONDITIONS: SYNTHETIC MOTHER LIQUOR = 75 % REMARK 280 SATURATED AMMONIUM SULFATE, 25 % 1.0 M SODIUM ACETATE ADJUSTED TO REMARK 280 PH 3.12. COMPLEX PRODUCED BY SOAKING STREPTAVIDIN-2-IMINOBIOTIN REMARK 280 CO-CRYSTAL.

REMARK 290 REMARK 290 CRYSTALLOGRAPHIC SYMMETRY REMARK 290 SYMMETRY OPERATORS FOR SPACE GROUP: I 41 2 2 REMARK 290 REMARK 290 SYMOP SYMMETRY REMARK 290 NNNMMM OPERATOR REMARK 290 1555 X,Y,Z REMARK 290 2555 -X+1/2,-Y+1/2,Z+1/2 REMARK 290 3555 -Y,X+1/2,Z+1/4 REMARK 290 4555 Y+1/2,-X,Z+3/4 REMARK 290 5555 -X+1/2,Y,-Z+3/4 REMARK 290 6555 X,-Y+1/2,-Z+1/4 REMARK 290 7555 Y+1/2,X+1/2,-Z+1/2 REMARK 290 8555 -Y,-X,-Z REMARK 290 9555 X+1/2,Y+1/2,Z+1/2 REMARK 290 10555 -X,-Y,Z REMARK 290 11555 -Y+1/2,X,Z+3/4 REMARK 290 12555 Y,-X+1/2,Z+1/4 REMARK 290 13555 -X,Y+1/2,-Z+1/4 REMARK 290 14555 X+1/2,-Y,-Z+3/4 REMARK 290 15555 Y,X,-Z REMARK 290 16555 -Y+1/2,-X+1/2,-Z+1/2 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 29.04500 REMARK 290 SMTRY2 2 0.000000 -1.000000 0.000000 29.04500 REMARK 290 SMTRY3 2 0.000000 0.000000 1.000000 87.52500 REMARK 290 SMTRY1 3 0.000000 -1.000000 0.000000 0.00000 REMARK 290 SMTRY2 3 1.000000 0.000000 0.000000 29.04500 REMARK 290 SMTRY3 3 0.000000 0.000000 1.000000 43.76250 REMARK 290 SMTRY1 4 0.000000 1.000000 0.000000 29.04500 REMARK 290 SMTRY2 4 -1.000000 0.000000 0.000000 0.00000 REMARK 290 SMTRY3 4 0.000000 0.000000 1.000000 131.28750 REMARK 290 SMTRY1 5 -1.000000 0.000000 0.000000 29.04500 REMARK 290 SMTRY2 5 0.000000 1.000000 0.000000 0.00000 REMARK 290 SMTRY3 5 0.000000 0.000000 -1.000000 131.28750 REMARK 290 SMTRY1 6 1.000000 0.000000 0.000000 0.00000 REMARK 290 SMTRY2 6 0.000000 -1.000000 0.000000 29.04500 REMARK 290 SMTRY3 6 0.000000 0.000000 -1.000000 43.76250 REMARK 290 SMTRY1 7 0.000000 1.000000 0.000000 29.04500 REMARK 290 SMTRY2 7 1.000000 0.000000 0.000000 29.04500 REMARK 290 SMTRY3 7 0.000000 0.000000 -1.000000 87.52500 REMARK 290 SMTRY1 8 0.000000 -1.000000 0.000000 0.00000 REMARK 290 SMTRY2 8 -1.000000 0.000000 0.000000 0.00000 REMARK 290 SMTRY3 8 0.000000 0.000000 -1.000000 0.00000 REMARK 290 SMTRY1 9 1.000000 0.000000 0.000000 29.04500 REMARK 290 SMTRY2 9 0.000000 1.000000 0.000000 29.04500 REMARK 290 SMTRY3 9 0.000000 0.000000 1.000000 87.52500 REMARK 290 SMTRY1 10 -1.000000 0.000000 0.000000 0.00000 REMARK 290 SMTRY2 10 0.000000 -1.000000 0.000000 0.00000 REMARK 290 SMTRY3 10 0.000000 0.000000 1.000000 0.00000 REMARK 290 SMTRY1 11 0.000000 -1.000000 0.000000 29.04500 REMARK 290 SMTRY2 11 1.000000 0.000000 0.000000 0.00000 REMARK 290 SMTRY3 11 0.000000 0.000000 1.000000 131.28750 REMARK 290 SMTRY1 12 0.000000 1.000000 0.000000 0.00000 REMARK 290 SMTRY2 12 -1.000000 0.000000 0.000000 29.04500 REMARK 290 SMTRY3 12 0.000000 0.000000 1.000000 43.76250 REMARK 290 SMTRY1 13 -1.000000 0.000000 0.000000 0.00000 REMARK 290 SMTRY2 13 0.000000 1.000000 0.000000 29.04500 REMARK 290 SMTRY3 13 0.000000 0.000000 -1.000000 43.76250 REMARK 290 SMTRY1 14 1.000000 0.000000 0.000000 29.04500 REMARK 290 SMTRY2 14 0.000000 -1.000000 0.000000 0.00000 REMARK 290 SMTRY3 14 0.000000 0.000000 -1.000000 131.28750 REMARK 290 SMTRY1 15 0.000000 1.000000 0.000000 0.00000 REMARK 290 SMTRY2 15 1.000000 0.000000 0.000000 0.00000 REMARK 290 SMTRY3 15 0.000000 0.000000 -1.000000 0.00000 REMARK 290 SMTRY1 16 0.000000 -1.000000 0.000000 29.04500 REMARK 290 SMTRY2 16 -1.000000 0.000000 0.000000 29.04500 REMARK 290 SMTRY3 16 0.000000 0.000000 -1.000000 87.52500 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 350 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 AUTHOR DETERMINED BIOLOGICAL UNIT: TETRAMERIC REMARK 350 SOFTWARE DETERMINED QUATERNARY STRUCTURE: TETRAMERIC REMARK 350 SOFTWARE USED: PISA,PQS REMARK 350 TOTAL BURIED SURFACE AREA: 10900 ANGSTROM**2 REMARK 350 SURFACE AREA OF THE COMPLEX: 19870 ANGSTROM**2 REMARK 350 CHANGE IN SOLVENT FREE ENERGY: -148.0 KCAL/MOL REMARK 350 APPLY THE FOLLOWING TO CHAINS: A 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 0.000000 -1.000000 0.000000 0.00000 REMARK 350 BIOMT2 2 -1.000000 0.000000 0.000000 0.00000 REMARK 350 BIOMT3 2 0.000000 0.000000 -1.000000 0.00000 REMARK 350 BIOMT1 3 -1.000000 0.000000 0.000000 0.00000 REMARK 350 BIOMT2 3 0.000000 -1.000000 0.000000 0.00000 REMARK 350 BIOMT3 3 0.000000 0.000000 1.000000 0.00000 REMARK 350 BIOMT1 4 0.000000 1.000000 0.000000 0.00000 REMARK 350 BIOMT2 4 1.000000 0.000000 0.000000 0.00000 REMARK 350 BIOMT3 4 0.000000 0.000000 -1.000000 0.00000

REMARK 375 REMARK 375 SPECIAL POSITION REMARK 375 THE FOLLOWING ATOMS ARE FOUND TO BE WITHIN 0.15 ANGSTROMS REMARK 375 OF A SYMMETRY RELATED ATOM AND ARE ASSUMED TO BE ON SPECIAL REMARK 375 POSITIONS. REMARK 375 REMARK 375 ATOM RES CSSEQI REMARK 375 HOH A 635 LIES ON A SPECIAL POSITION. REMARK 375 HOH A 673 LIES ON A SPECIAL POSITION. REMARK 375 HOH A 546 LIES ON A SPECIAL POSITION. REMARK 375 HOH A 550 LIES ON A SPECIAL POSITION. REMARK 375 HOH A 681 LIES ON A SPECIAL POSITION.

REMARK 475 REMARK 475 ZERO OCCUPANCY RESIDUES REMARK 475 THE FOLLOWING RESIDUES WERE MODELED WITH ZERO OCCUPANCY. REMARK 475 THE LOCATION AND PROPERTIES OF THESE RESIDUES MAY NOT REMARK 475 BE RELIABLE. (M=MODEL NUMBER; RES=RESIDUE NAME; REMARK 475 C=CHAIN IDENTIFIER; SSEQ=SEQUENCE NUMBER; I=INSERTION CODE) REMARK 475 M RES C SSEQI REMARK 475 THR A 66

REMARK 480 REMARK 480 ZERO OCCUPANCY ATOM REMARK 480 THE FOLLOWING RESIDUES HAVE ATOMS MODELED WITH ZERO REMARK 480 OCCUPANCY. THE LOCATION AND PROPERTIES OF THESE ATOMS REMARK 480 MAY NOT BE RELIABLE. (M=MODEL NUMBER; RES=RESIDUE NAME; REMARK 480 C=CHAIN IDENTIFIER; SSEQ=SEQUENCE NUMBER; I=INSERTION CODE): REMARK 480 M RES C SSEQI ATOMS REMARK 480 GLN A 24 CB CG CD OE1 NE2 REMARK 480 ASP A 36 CG OD1 OD2 REMARK 480 ALA A 100 CB REMARK 480 GLU A 101 CG CD OE1 OE2 REMARK 480 GLU A 116 CD OE1 OE2

REMARK 500 REMARK 500 GEOMETRY AND STEREOCHEMISTRY REMARK 500 SUBTOPIC: CLOSE CONTACTS IN SAME ASYMMETRIC UNIT REMARK 500 REMARK 500 THE FOLLOWING ATOMS ARE IN CLOSE CONTACT. REMARK 500 REMARK 500 ATM1 RES C SSEQI ATM2 RES C SSEQI DISTANCE REMARK 500 H2 HOH A 644 H2 HOH A 645 0.90 REMARK 500 H2 HOH A 644 O HOH A 645 1.11 REMARK 500 O HOH A 644 O HOH A 645 1.36 REMARK 500 REMARK 500 REMARK: NULL REMARK 500 REMARK 500 GEOMETRY AND STEREOCHEMISTRY REMARK 500 SUBTOPIC: CLOSE CONTACTS REMARK 500 REMARK 500 THE FOLLOWING ATOMS THAT ARE RELATED BY CRYSTALLOGRAPHIC REMARK 500 SYMMETRY ARE IN CLOSE CONTACT. AN ATOM LOCATED WITHIN 0.15 REMARK 500 ANGSTROMS OF A SYMMETRY RELATED ATOM IS ASSUMED TO BE ON A REMARK 500 SPECIAL POSITION AND IS, THEREFORE, LISTED IN REMARK 375 REMARK 500 INSTEAD OF REMARK 500. ATOMS WITH NON-BLANK ALTERNATE REMARK 500 LOCATION INDICATORS ARE NOT INCLUDED IN THE CALCULATIONS. REMARK 500 REMARK 500 DISTANCE CUTOFF: REMARK 500 2.2 ANGSTROMS FOR CONTACTS NOT INVOLVING HYDROGEN ATOMS REMARK 500 1.6 ANGSTROMS FOR CONTACTS INVOLVING HYDROGEN ATOMS REMARK 500 REMARK 500 ATM1 RES C SSEQI ATM2 RES C SSEQI SSYMOP DISTANCE REMARK 500 H2 HOH A 681 H2 HOH A 681 10655 0.52 REMARK 500 O HOH A 305 H1 HOH A 305 15555 0.53 REMARK 500 O HOH A 305 O HOH A 305 15555 0.53 REMARK 500 H1 HOH A 305 H2 HOH A 305 15555 0.76 REMARK 500 H1 HOH A 673 H2 HOH A 673 10655 0.96 REMARK 500 H1 HOH A 673 H1 HOH A 673 10655 0.99 REMARK 500 O HOH A 207 H2 HOH A 354 10555 1.06 REMARK 500 H1 HOH A 550 H2 HOH A 550 6555 1.07 REMARK 500 HE21 GLN A 107 H2 HOH A 635 10555 1.09 REMARK 500 O HOH A 305 H2 HOH A 305 15555 1.17 REMARK 500 H1 HOH A 681 H2 HOH A 681 10655 1.21 REMARK 500 HH21 ARG A 59 H1 HOH A 231 15555 1.25 REMARK 500 H1 HOH A 635 H1 HOH A 635 8555 1.26 REMARK 500 O HOH A 207 O HOH A 354 10555 1.62 REMARK 500 REMARK 500 REMARK: NULL REMARK 500 REMARK 500 GEOMETRY AND STEREOCHEMISTRY REMARK 500 SUBTOPIC: COVALENT BOND LENGTHS 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,2(A3,1X,A1,I4,A1,1X,A4,3X),1X,F6.3) 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 RES CSSEQI ATM2 DEVIATION REMARK 500 SER A 52 CA SER A 52 CB 0.114 REMARK 500 REMARK 500 REMARK: NULL 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 TRP A 21 CG - CD1 - NE1 ANGL. DEV. = -6.7 DEGREES REMARK 500 TRP A 21 CD1 - NE1 - CE2 ANGL. DEV. = 7.6 DEGREES REMARK 500 TRP A 21 NE1 - CE2 - CZ2 ANGL. DEV. = 8.3 DEGREES REMARK 500 TYR A 43 CB - CG - CD2 ANGL. DEV. = -3.7 DEGREES REMARK 500 ARG A 59 NE - CZ - NH1 ANGL. DEV. = 3.4 DEGREES REMARK 500 TRP A 75 CG - CD1 - NE1 ANGL. DEV. = -7.5 DEGREES REMARK 500 TRP A 75 CD1 - NE1 - CE2 ANGL. DEV. = 8.1 DEGREES REMARK 500 TRP A 75 NE1 - CE2 - CZ2 ANGL. DEV. = 7.5 DEGREES REMARK 500 TRP A 79 CG - CD1 - NE1 ANGL. DEV. = -6.5 DEGREES REMARK 500 TRP A 79 CD1 - NE1 - CE2 ANGL. DEV. = 7.8 DEGREES REMARK 500 TYR A 83 CB - CG - CD1 ANGL. DEV. = -3.9 DEGREES REMARK 500 TRP A 92 CG - CD1 - NE1 ANGL. DEV. = -8.3 DEGREES REMARK 500 TRP A 92 CD1 - NE1 - CE2 ANGL. DEV. = 7.8 DEGREES REMARK 500 ARG A 103 NE - CZ - NH2 ANGL. DEV. = -3.9 DEGREES REMARK 500 TRP A 108 CG - CD1 - NE1 ANGL. DEV. = -7.5 DEGREES REMARK 500 TRP A 108 CD1 - NE1 - CE2 ANGL. DEV. = 8.1 DEGREES REMARK 500 TRP A 108 NE1 - CE2 - CZ2 ANGL. DEV. = 7.1 DEGREES REMARK 500 TRP A 120 CG - CD1 - NE1 ANGL. DEV. = -6.6 DEGREES REMARK 500 TRP A 120 CD1 - NE1 - CE2 ANGL. DEV. = 8.4 DEGREES REMARK 500 TRP A 120 NE1 - CE2 - CZ2 ANGL. DEV. = 9.3 DEGREES REMARK 500 TRP A 120 NE1 - CE2 - CD2 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 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 GLU A 14 -82.34 31.42 REMARK 500 ASP A 36 42.42 -100.18 REMARK 500 ASN A 49 59.26 -102.60 REMARK 500 GLU A 51 102.68 -168.15 REMARK 500 SER A 52 -153.16 99.77 REMARK 500 GLU A 101 75.60 -119.49 REMARK 500 REMARK 500 REMARK: NULL REMARK 500 REMARK 500 GEOMETRY AND STEREOCHEMISTRY REMARK 500 SUBTOPIC: PLANAR GROUPS REMARK 500 REMARK 500 PLANAR GROUPS IN THE FOLLOWING RESIDUES HAVE A TOTAL REMARK 500 RMS DISTANCE OF ALL ATOMS FROM THE BEST-FIT PLANE REMARK 500 BY MORE THAN AN EXPECTED VALUE OF 6*RMSD, WITH AN REMARK 500 RMSD 0.02 ANGSTROMS, OR AT LEAST ONE ATOM HAS REMARK 500 AN RMSD GREATER THAN THIS VALUE REMARK 500 (M=MODEL NUMBER; RES=RESIDUE NAME; C=CHAIN IDENTIFIER; REMARK 500 SSEQ=SEQUENCE NUMBER; I=INSERTION CODE). REMARK 500 REMARK 500 M RES CSSEQI RMS TYPE REMARK 500 ARG A 84 0.26 SIDE CHAIN 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 525 REMARK 525 M RES CSSEQI REMARK 525 HOH A 143 DISTANCE = 25.71 ANGSTROMS REMARK 525 HOH A 233 DISTANCE = 7.55 ANGSTROMS REMARK 525 HOH A 234 DISTANCE = 7.33 ANGSTROMS REMARK 525 HOH A 244 DISTANCE = 16.46 ANGSTROMS REMARK 525 HOH A 278 DISTANCE = 21.04 ANGSTROMS REMARK 525 HOH A 305 DISTANCE = 19.01 ANGSTROMS REMARK 525 HOH A 354 DISTANCE = 7.40 ANGSTROMS REMARK 525 HOH A 484 DISTANCE = 14.74 ANGSTROMS REMARK 525 HOH A 550 DISTANCE = 8.21 ANGSTROMS REMARK 525 HOH A 594 DISTANCE = 6.17 ANGSTROMS REMARK 525 HOH A 611 DISTANCE = 8.62 ANGSTROMS REMARK 525 HOH A 613 DISTANCE = 9.99 ANGSTROMS REMARK 525 HOH A 614 DISTANCE = 16.72 ANGSTROMS REMARK 525 HOH A 621 DISTANCE = 5.81 ANGSTROMS REMARK 525 HOH A 635 DISTANCE = 8.36 ANGSTROMS REMARK 525 HOH A 652 DISTANCE = 17.18 ANGSTROMS REMARK 525 HOH A 673 DISTANCE = 5.07 ANGSTROMS REMARK 525 HOH A 674 DISTANCE = 8.79 ANGSTROMS REMARK 525 HOH A 691 DISTANCE = 5.64 ANGSTROMS REMARK 525 HOH A 693 DISTANCE = 8.19 ANGSTROMS REMARK 525 HOH A 694 DISTANCE = 6.05 ANGSTROMS REMARK 525 HOH A 700 DISTANCE = 8.01 ANGSTROMS REMARK 525 HOH A 701 DISTANCE = 7.54 ANGSTROMS REMARK 525 HOH A 703 DISTANCE = 5.58 ANGSTROMS

REMARK 800 REMARK 800 SITE REMARK 800 SITE_IDENTIFIER: AC1 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE SO4 A 153 REMARK 800 REMARK 800 SITE_IDENTIFIER: AC2 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE FMT A 156

DBREF 2IZB A 13 134 UNP P22629 SAV_STRAV 37 158

SEQRES 1 A 122 ALA GLU ALA GLY ILE THR GLY THR TRP TYR ASN GLN LEU SEQRES 2 A 122 GLY SER THR PHE ILE VAL THR ALA GLY ALA ASP GLY ALA SEQRES 3 A 122 LEU THR GLY THR TYR GLU SER ALA VAL GLY ASN ALA GLU SEQRES 4 A 122 SER ARG TYR VAL LEU THR GLY ARG TYR ASP SER ALA PRO SEQRES 5 A 122 ALA THR ASP GLY SER GLY THR ALA LEU GLY TRP THR VAL SEQRES 6 A 122 ALA TRP LYS ASN ASN TYR ARG ASN ALA HIS SER ALA THR SEQRES 7 A 122 THR TRP SER GLY GLN TYR VAL GLY GLY ALA GLU ALA ARG SEQRES 8 A 122 ILE ASN THR GLN TRP LEU LEU THR SER GLY THR THR GLU SEQRES 9 A 122 ALA ASN ALA TRP LYS SER THR LEU VAL GLY HIS ASP THR SEQRES 10 A 122 PHE THR LYS VAL LYS

HET SO4 A 153 5 HET FMT A 156 8

HETNAM SO4 SULFATE ION HETNAM FMT FORMIC ACID

FORMUL 2 SO4 O4 S 2- FORMUL 3 FMT C H2 O2 FORMUL 4 HOH *91(H2 O)

HELIX 1 1 GLU A 14 GLY A 16 5 3 HELIX 2 2 GLU A 116 LYS A 121 5 6

SHEET 1 A 8 GLY A 19 TYR A 22 0 SHEET 2 A 8 THR A 28 ALA A 33 -1 N VAL A 31 O GLY A 19 SHEET 3 A 8 ALA A 38 GLU A 44 -1 N GLU A 44 O THR A 28 SHEET 4 A 8 ARG A 53 TYR A 60 -1 N GLY A 58 O LEU A 39 SHEET 5 A 8 THR A 71 ALA A 78 -1 N THR A 76 O THR A 57 SHEET 6 A 8 SER A 88 VAL A 97 -1 N TYR A 96 O THR A 71 SHEET 7 A 8 ARG A 103 SER A 112 -1 N THR A 111 O ALA A 89 SHEET 8 A 8 THR A 123 THR A 131 -1 N PHE A 130 O ILE A 104

SITE 1 AC1 8 TRP A 79 THR A 90 TRP A 92 TRP A 108 SITE 2 AC1 8 LEU A 110 HOH A 151 HOH A 152 HOH A 155 SITE 1 AC2 6 GLY A 48 ASN A 49 ALA A 86 SER A 88 SITE 2 AC2 6 HOH A 152 HOH A 158

CRYST1 58.090 58.090 175.050 90.00 90.00 90.00 I 41 2 2 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 0.017215 0.000000 0.000000 0.00000

SCALE2 0.000000 0.017215 0.000000 0.00000

SCALE3 0.000000 0.000000 0.005713 0.00000