2IZF - Header Asymmetric Unit

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

TITLE STREPTAVIDIN-BIOTIN PH 4.0 I222 COMPLEX

COMPND MOL_ID: 1; COMPND 2 MOLECULE: STREPTAVIDIN; COMPND 3 CHAIN: B, D

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

KEYWDS BIOTIN-BINDING PROTEIN, STREPTAVIDIN-BIOTIN

EXPDTA X-RAY DIFFRACTION

AUTHOR B.A.KATZ

REVDAT 3 08-FEB-17 2IZF 1 REMARK VERSN REVDAT 2 24-FEB-09 2IZF 1 VERSN REVDAT 1 16-SEP-98 2IZF 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 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. 1.58 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) : 1.58 REMARK 3 RESOLUTION RANGE LOW (ANGSTROMS) : 7.50 REMARK 3 DATA CUTOFF (SIGMA(F)) : 1.900 REMARK 3 DATA CUTOFF HIGH (ABS(F)) : NULL REMARK 3 DATA CUTOFF LOW (ABS(F)) : NULL REMARK 3 COMPLETENESS (WORKING+TEST) (%) : 84.0 REMARK 3 NUMBER OF REFLECTIONS : 27062 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) : 0.165 REMARK 3 FREE R VALUE : 0.200 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) : 1.58 REMARK 3 BIN RESOLUTION RANGE LOW (A) : 1.64 REMARK 3 BIN COMPLETENESS (WORKING+TEST) (%) : 41.60 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 : 1819 REMARK 3 NUCLEIC ACID ATOMS : 0 REMARK 3 HETEROGEN ATOMS : 37 REMARK 3 SOLVENT ATOMS : 219 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) : 3.000 REMARK 3 DIHEDRAL ANGLES (DEGREES) : 27.200 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 : PARAM19XB2_KBCO.PRO REMARK 3 PARAMETER FILE 2 : NULL REMARK 3 PARAMETER FILE 3 : NULL REMARK 3 TOPOLOGY FILE 1 : TOPH19XB2_BTN2.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: ALA B13, GLU B14, ALA B15, (CG, CD, OE1, OE2 OF REMARK 3 GLU B51), (NE, CZ, NH1, NH2 OF ARG B53), ASP B67, GLY B68 REMARK 3 (NE, CZ, NH1, NH2 OF ARG B84), (NE, CZ, NH1, NH2 OF ARG REMARK 3 B103), (CG, CD, OE1, OE2 OF GLU B116), (MAIN CHAIN OF REMARK 3 LYS B134), (CB, CG, CD, CE OF LYS B134), (NZ OF LYS B134), REMARK 3 PRO B135, ALA D13, GLU D14, ALA D15, (CG, OD1, OD2 OF REMARK 3 ASP D36), (NE, CZ, NH1, NH2 OF ARG D53), (CG, OD1, ND2 OF REMARK 3 ASN D82), (NE, CZ, NH1, NH2 OF ARG D84), (CG, CD, OE1, OE2 REMARK 3 OF GLU D101), (NE, CZ, NH1, NH2 OF ARG D103), (CG, CD, OE1, REMARK 3 OE2 OF GLU D116), REMARK 3 REMARK 3 IN REFINEMENT THERE WERE NO ENERGY INTERACTIONS INVOLVING REMARK 3 THE ABOVE WATERS. BULK SOLVENT CONTRIBUTIONS WERE INCLUDED REMARK 3 IN REFINEMENT.

REMARK 4 REMARK 4 2IZF 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 : 4.0 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 REMARK 200 INTENSITY-INTEGRATION SOFTWARE : BIOTEX REMARK 200 DATA SCALING SOFTWARE : NULL REMARK 200 REMARK 200 NUMBER OF UNIQUE REFLECTIONS : 28476 REMARK 200 RESOLUTION RANGE HIGH (A) : NULL REMARK 200 RESOLUTION RANGE LOW (A) : NULL REMARK 200 REJECTION CRITERIA (SIGMA(I)) : 0.500 REMARK 200 REMARK 200 OVERALL. REMARK 200 COMPLETENESS FOR RANGE (%) : NULL REMARK 200 DATA REDUNDANCY : 3.200 REMARK 200 R MERGE (I) : 0.04400 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 (%): 19.80 REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 2.28 REMARK 280 REMARK 280 CRYSTALLIZATION CONDITIONS: SYNTHETIC MOTHER LIQUOR = 75 % REMARK 280 SATURATED AMMONIUM SULFATE, 25 % 1.0 M POTASSIUM ACETATE ADJUSTED REMARK 280 TO PH 4.0.

REMARK 290 REMARK 290 CRYSTALLOGRAPHIC SYMMETRY REMARK 290 SYMMETRY OPERATORS FOR SPACE GROUP: I 2 2 2 REMARK 290 REMARK 290 SYMOP SYMMETRY REMARK 290 NNNMMM OPERATOR REMARK 290 1555 X,Y,Z REMARK 290 2555 -X,-Y,Z REMARK 290 3555 -X,Y,-Z REMARK 290 4555 X,-Y,-Z REMARK 290 5555 X+1/2,Y+1/2,Z+1/2 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+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 0.00000 REMARK 290 SMTRY2 2 0.000000 -1.000000 0.000000 0.00000 REMARK 290 SMTRY3 2 0.000000 0.000000 1.000000 0.00000 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 0.00000 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 47.50000 REMARK 290 SMTRY2 5 0.000000 1.000000 0.000000 52.67000 REMARK 290 SMTRY3 5 0.000000 0.000000 1.000000 23.59500 REMARK 290 SMTRY1 6 -1.000000 0.000000 0.000000 47.50000 REMARK 290 SMTRY2 6 0.000000 -1.000000 0.000000 52.67000 REMARK 290 SMTRY3 6 0.000000 0.000000 1.000000 23.59500 REMARK 290 SMTRY1 7 -1.000000 0.000000 0.000000 47.50000 REMARK 290 SMTRY2 7 0.000000 1.000000 0.000000 52.67000 REMARK 290 SMTRY3 7 0.000000 0.000000 -1.000000 23.59500 REMARK 290 SMTRY1 8 1.000000 0.000000 0.000000 47.50000 REMARK 290 SMTRY2 8 0.000000 -1.000000 0.000000 52.67000 REMARK 290 SMTRY3 8 0.000000 0.000000 -1.000000 23.59500 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 APPLY THE FOLLOWING TO CHAINS: B, D 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 0.00000 REMARK 350 BIOMT2 2 0.000000 -1.000000 0.000000 0.00000 REMARK 350 BIOMT3 2 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 B1673 LIES ON A SPECIAL POSITION. REMARK 375 HOH B1688 LIES ON A SPECIAL POSITION. REMARK 375 HOH B1676 LIES ON A SPECIAL POSITION.

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 LYS D 134 REMARK 465 PRO D 135

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 TYR B 22 CB CG CD1 CD2 CE1 CE2 CZ REMARK 480 TYR B 22 OH REMARK 480 GLU B 116 CG CD OE1 OE2 REMARK 480 LYS B 134 NZ

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 HH11 ARG B 59 H1 HOH B 643 1.17 REMARK 500 HE ARG D 59 H1 HOH B 605 1.33 REMARK 500 CB ASP B 67 H1 HOH B 1676 1.37 REMARK 500 H1 HOH B 609 O HOH D 1564 1.60 REMARK 500 CB ASP B 67 O HOH B 1676 2.09 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 O HOH B 1676 H1 HOH B 1676 4556 0.98 REMARK 500 O HOH B 1676 H2 HOH B 1676 4556 0.98 REMARK 500 O HOH B 1673 H1 HOH B 1673 4555 1.00 REMARK 500 O HOH B 1673 H2 HOH B 1673 4555 1.00 REMARK 500 O HOH B 1688 H1 HOH B 1688 4555 1.04 REMARK 500 O HOH B 1688 H2 HOH B 1688 4555 1.04 REMARK 500 H1 HOH B 1673 H2 HOH B 1673 4555 1.17 REMARK 500 H1 HOH B 1688 H2 HOH B 1688 4555 1.17 REMARK 500 H1 HOH B 1676 H2 HOH B 1676 4556 1.17 REMARK 500 HZ2 LYS D 121 H2 HOH D 1635 4556 1.18 REMARK 500 HZ2 LYS B 80 H1 HOH B 966 6554 1.34 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 B 21 CD1 - CG - CD2 ANGL. DEV. = 6.2 DEGREES REMARK 500 TRP B 21 CE2 - CD2 - CG ANGL. DEV. = -5.3 DEGREES REMARK 500 ARG B 59 NE - CZ - NH2 ANGL. DEV. = -3.1 DEGREES REMARK 500 TRP B 75 CD1 - CG - CD2 ANGL. DEV. = 6.3 DEGREES REMARK 500 TRP B 75 CE2 - CD2 - CG ANGL. DEV. = -5.5 DEGREES REMARK 500 TRP B 79 CD1 - CG - CD2 ANGL. DEV. = 5.3 DEGREES REMARK 500 TRP B 79 CE2 - CD2 - CG ANGL. DEV. = -5.3 DEGREES REMARK 500 TRP B 108 CD1 - CG - CD2 ANGL. DEV. = 5.2 DEGREES REMARK 500 TRP B 120 CD1 - CG - CD2 ANGL. DEV. = 5.0 DEGREES REMARK 500 TRP D 21 CD1 - CG - CD2 ANGL. DEV. = 5.2 DEGREES REMARK 500 VAL D 31 CB - CA - C ANGL. DEV. = -14.2 DEGREES REMARK 500 VAL D 31 CG1 - CB - CG2 ANGL. DEV. = 16.8 DEGREES REMARK 500 ARG D 53 NE - CZ - NH1 ANGL. DEV. = 3.8 DEGREES REMARK 500 ARG D 59 NE - CZ - NH2 ANGL. DEV. = -3.4 DEGREES REMARK 500 TRP D 75 CD1 - CG - CD2 ANGL. DEV. = 5.6 DEGREES REMARK 500 TRP D 75 CE2 - CD2 - CG ANGL. DEV. = -5.8 DEGREES REMARK 500 TRP D 79 CD1 - CG - CD2 ANGL. DEV. = 5.8 DEGREES REMARK 500 TRP D 79 CE2 - CD2 - CG ANGL. DEV. = -5.9 DEGREES REMARK 500 TRP D 92 CD1 - CG - CD2 ANGL. DEV. = 6.3 DEGREES REMARK 500 TRP D 92 CE2 - CD2 - CG ANGL. DEV. = -5.4 DEGREES REMARK 500 TRP D 120 CD1 - CG - CD2 ANGL. DEV. = 6.3 DEGREES REMARK 500 TRP D 120 CE2 - CD2 - CG ANGL. DEV. = -5.5 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 SER B 52 -161.89 65.58 REMARK 500 ASP B 67 -158.68 -90.35 REMARK 500 LYS B 134 99.62 -42.30 REMARK 500 GLU D 14 6.57 45.03 REMARK 500 SER D 52 -156.31 68.05 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 B 510 DISTANCE = 7.85 ANGSTROMS REMARK 525 HOH B 525 DISTANCE = 5.30 ANGSTROMS REMARK 525 HOH B 528 DISTANCE = 7.27 ANGSTROMS REMARK 525 HOH B 534 DISTANCE = 6.95 ANGSTROMS REMARK 525 HOH B 549 DISTANCE = 7.84 ANGSTROMS REMARK 525 HOH B 745 DISTANCE = 5.35 ANGSTROMS REMARK 525 HOH B 972 DISTANCE = 7.32 ANGSTROMS REMARK 525 HOH B 999 DISTANCE = 12.08 ANGSTROMS REMARK 525 HOH B1000 DISTANCE = 9.56 ANGSTROMS REMARK 525 HOH B1077 DISTANCE = 12.17 ANGSTROMS REMARK 525 HOH B1082 DISTANCE = 5.57 ANGSTROMS REMARK 525 HOH B1083 DISTANCE = 8.65 ANGSTROMS REMARK 525 HOH B1104 DISTANCE = 7.24 ANGSTROMS REMARK 525 HOH B1116 DISTANCE = 10.31 ANGSTROMS REMARK 525 HOH B1406 DISTANCE = 9.64 ANGSTROMS REMARK 525 HOH B1461 DISTANCE = 10.66 ANGSTROMS REMARK 525 HOH B1471 DISTANCE = 5.55 ANGSTROMS REMARK 525 HOH B1521 DISTANCE = 6.44 ANGSTROMS REMARK 525 HOH B1527 DISTANCE = 9.19 ANGSTROMS REMARK 525 HOH B1536 DISTANCE = 6.54 ANGSTROMS REMARK 525 HOH B1544 DISTANCE = 18.38 ANGSTROMS REMARK 525 HOH B1560 DISTANCE = 9.46 ANGSTROMS REMARK 525 HOH B1575 DISTANCE = 11.34 ANGSTROMS REMARK 525 HOH B1602 DISTANCE = 14.76 ANGSTROMS REMARK 525 HOH B1605 DISTANCE = 9.71 ANGSTROMS REMARK 525 HOH B1623 DISTANCE = 7.67 ANGSTROMS REMARK 525 HOH B1629 DISTANCE = 6.98 ANGSTROMS REMARK 525 HOH B1632 DISTANCE = 10.71 ANGSTROMS REMARK 525 HOH B1655 DISTANCE = 9.56 ANGSTROMS REMARK 525 HOH B1661 DISTANCE = 6.67 ANGSTROMS REMARK 525 HOH B1673 DISTANCE = 8.94 ANGSTROMS REMARK 525 HOH B1675 DISTANCE = 6.42 ANGSTROMS REMARK 525 HOH B1683 DISTANCE = 24.46 ANGSTROMS REMARK 525 HOH D 514 DISTANCE = 6.00 ANGSTROMS REMARK 525 HOH D 530 DISTANCE = 9.04 ANGSTROMS REMARK 525 HOH D 952 DISTANCE = 16.03 ANGSTROMS REMARK 525 HOH D 968 DISTANCE = 15.92 ANGSTROMS REMARK 525 HOH D1071 DISTANCE = 6.93 ANGSTROMS REMARK 525 HOH D1140 DISTANCE = 17.30 ANGSTROMS REMARK 525 HOH D1186 DISTANCE = 8.60 ANGSTROMS REMARK 525 HOH D1236 DISTANCE = 11.00 ANGSTROMS REMARK 525 HOH D1241 DISTANCE = 13.87 ANGSTROMS REMARK 525 HOH D1313 DISTANCE = 8.94 ANGSTROMS REMARK 525 HOH D1343 DISTANCE = 9.12 ANGSTROMS REMARK 525 HOH D1467 DISTANCE = 6.38 ANGSTROMS REMARK 525 HOH D1492 DISTANCE = 10.22 ANGSTROMS REMARK 525 HOH D1493 DISTANCE = 15.14 ANGSTROMS REMARK 525 HOH D1505 DISTANCE = 6.59 ANGSTROMS REMARK 525 HOH D1507 DISTANCE = 9.87 ANGSTROMS REMARK 525 HOH D1512 DISTANCE = 5.31 ANGSTROMS REMARK 525 HOH D1520 DISTANCE = 5.92 ANGSTROMS REMARK 525 HOH D1532 DISTANCE = 7.49 ANGSTROMS REMARK 525 HOH D1533 DISTANCE = 7.01 ANGSTROMS REMARK 525 HOH D1540 DISTANCE = 14.64 ANGSTROMS REMARK 525 HOH D1542 DISTANCE = 6.25 ANGSTROMS REMARK 525 HOH D1562 DISTANCE = 7.09 ANGSTROMS REMARK 525 HOH D1565 DISTANCE = 9.64 ANGSTROMS REMARK 525 HOH D1569 DISTANCE = 11.09 ANGSTROMS REMARK 525 HOH D1574 DISTANCE = 5.17 ANGSTROMS REMARK 525 HOH D1581 DISTANCE = 28.45 ANGSTROMS REMARK 525 HOH D1583 DISTANCE = 14.64 ANGSTROMS REMARK 525 HOH D1598 DISTANCE = 7.98 ANGSTROMS REMARK 525 HOH D1607 DISTANCE = 7.68 ANGSTROMS REMARK 525 HOH D1609 DISTANCE = 9.60 ANGSTROMS REMARK 525 HOH D1612 DISTANCE = 5.57 ANGSTROMS REMARK 525 HOH D1619 DISTANCE = 5.25 ANGSTROMS REMARK 525 HOH D1633 DISTANCE = 12.01 ANGSTROMS REMARK 525 HOH D1635 DISTANCE = 10.15 ANGSTROMS REMARK 525 HOH D1647 DISTANCE = 5.82 ANGSTROMS REMARK 525 HOH D1659 DISTANCE = 12.87 ANGSTROMS REMARK 525 HOH D1660 DISTANCE = 16.11 ANGSTROMS REMARK 525 HOH D1684 DISTANCE = 7.20 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 D 300 REMARK 800 REMARK 800 SITE_IDENTIFIER: AC2 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE BTN B 300 REMARK 800 REMARK 800 SITE_IDENTIFIER: AC3 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE BTN D 301

DBREF 2IZF B 13 135 UNP P22629 SAV_STRAV 37 159 DBREF 2IZF D 13 135 UNP P22629 SAV_STRAV 37 159

SEQRES 1 B 123 ALA GLU ALA GLY ILE THR GLY THR TRP TYR ASN GLN LEU SEQRES 2 B 123 GLY SER THR PHE ILE VAL THR ALA GLY ALA ASP GLY ALA SEQRES 3 B 123 LEU THR GLY THR TYR GLU SER ALA VAL GLY ASN ALA GLU SEQRES 4 B 123 SER ARG TYR VAL LEU THR GLY ARG TYR ASP SER ALA PRO SEQRES 5 B 123 ALA THR ASP GLY SER GLY THR ALA LEU GLY TRP THR VAL SEQRES 6 B 123 ALA TRP LYS ASN ASN TYR ARG ASN ALA HIS SER ALA THR SEQRES 7 B 123 THR TRP SER GLY GLN TYR VAL GLY GLY ALA GLU ALA ARG SEQRES 8 B 123 ILE ASN THR GLN TRP LEU LEU THR SER GLY THR THR GLU SEQRES 9 B 123 ALA ASN ALA TRP LYS SER THR LEU VAL GLY HIS ASP THR SEQRES 10 B 123 PHE THR LYS VAL LYS PRO SEQRES 1 D 123 ALA GLU ALA GLY ILE THR GLY THR TRP TYR ASN GLN LEU SEQRES 2 D 123 GLY SER THR PHE ILE VAL THR ALA GLY ALA ASP GLY ALA SEQRES 3 D 123 LEU THR GLY THR TYR GLU SER ALA VAL GLY ASN ALA GLU SEQRES 4 D 123 SER ARG TYR VAL LEU THR GLY ARG TYR ASP SER ALA PRO SEQRES 5 D 123 ALA THR ASP GLY SER GLY THR ALA LEU GLY TRP THR VAL SEQRES 6 D 123 ALA TRP LYS ASN ASN TYR ARG ASN ALA HIS SER ALA THR SEQRES 7 D 123 THR TRP SER GLY GLN TYR VAL GLY GLY ALA GLU ALA ARG SEQRES 8 D 123 ILE ASN THR GLN TRP LEU LEU THR SER GLY THR THR GLU SEQRES 9 D 123 ALA ASN ALA TRP LYS SER THR LEU VAL GLY HIS ASP THR SEQRES 10 D 123 PHE THR LYS VAL LYS PRO

HET SO4 D 300 5 HET BTN B 300 18 HET BTN D 301 18

HETNAM SO4 SULFATE ION HETNAM BTN BIOTIN

FORMUL 3 SO4 O4 S 2- FORMUL 4 BTN 2(C10 H16 N2 O3 S) FORMUL 6 HOH *219(H2 O)

HELIX 1 1 GLU B 14 ILE B 17 1 4 HELIX 2 2 GLU B 116 LYS B 121 5 6 HELIX 3 3 GLU D 116 LYS D 121 5 6

SHEET 1 A 9 THR B 28 VAL B 31 0 SHEET 2 A 9 GLY B 19 ASN B 23 -1 N TRP B 21 O PHE B 29 SHEET 3 A 9 THR B 123 LYS B 132 -1 N THR B 131 O TYR B 22 SHEET 4 A 9 ARG B 103 SER B 112 -1 N LEU B 110 O LEU B 124 SHEET 5 A 9 SER B 88 VAL B 97 -1 N VAL B 97 O ARG B 103 SHEET 6 A 9 THR B 71 ALA B 78 -1 N VAL B 77 O THR B 90 SHEET 7 A 9 TYR B 54 TYR B 60 -1 N ARG B 59 O GLY B 74 SHEET 8 A 9 ALA B 38 GLU B 44 -1 N TYR B 43 O TYR B 54 SHEET 9 A 9 THR B 28 ALA B 33 -1 N THR B 32 O THR B 40 SHEET 1 B 8 GLY D 19 TYR D 22 0 SHEET 2 B 8 THR D 28 ALA D 33 -1 N VAL D 31 O GLY D 19 SHEET 3 B 8 ALA D 38 GLU D 44 -1 N GLU D 44 O THR D 28 SHEET 4 B 8 TYR D 54 TYR D 60 -1 N GLY D 58 O LEU D 39 SHEET 5 B 8 THR D 71 ALA D 78 -1 N THR D 76 O THR D 57 SHEET 6 B 8 SER D 88 VAL D 97 -1 N TYR D 96 O THR D 71 SHEET 7 B 8 ARG D 103 SER D 112 -1 N THR D 111 O ALA D 89 SHEET 8 B 8 THR D 123 PHE D 130 -1 N PHE D 130 O ILE D 104

SITE 1 AC1 5 TRP B 120 LYS B 121 VAL D 47 GLY D 48 SITE 2 AC1 5 ARG D 84 SITE 1 AC2 15 ASN B 23 LEU B 25 SER B 27 TYR B 43 SITE 2 AC2 15 SER B 45 VAL B 47 GLY B 48 ASN B 49 SITE 3 AC2 15 TRP B 79 SER B 88 THR B 90 TRP B 108 SITE 4 AC2 15 ASP B 128 HOH B1470 HOH D1617 SITE 1 AC3 15 ASN D 23 LEU D 25 SER D 27 TYR D 43 SITE 2 AC3 15 SER D 45 VAL D 47 GLY D 48 ASN D 49 SITE 3 AC3 15 TRP D 79 ALA D 86 SER D 88 THR D 90 SITE 4 AC3 15 TRP D 108 ASP D 128 HOH D1519

CRYST1 95.000 105.340 47.190 90.00 90.00 90.00 I 2 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 0.010526 0.000000 0.000000 0.00000

SCALE2 0.000000 0.009493 0.000000 0.00000

SCALE3 0.000000 0.000000 0.021191 0.00000

MTRIX1 1 -0.999739 -0.020722 -0.009639 51.99190 1

MTRIX2 1 -0.021578 0.716905 0.696837 0.60550 1

MTRIX3 1 -0.007529 0.696863 -0.717165 0.25820 1