1LTB - Header Asymmetric Unit

HEADER ENTEROTOXIN 15-SEP-93 1LTB

TITLE 2.6 ANGSTROMS CRYSTAL STRUCTURE OF PARTIALLY-ACTIVATED E. TITLE 2 COLI HEAT-LABILE ENTEROTOXIN (LT)

COMPND MOL_ID: 1; COMPND 2 MOLECULE: HEAT-LABILE ENTEROTOXIN, SUBUNIT B; COMPND 3 CHAIN: D, E, F, G, H; COMPND 4 ENGINEERED: YES; COMPND 5 MOL_ID: 2; COMPND 6 MOLECULE: HEAT-LABILE ENTEROTOXIN, SUBUNIT A; COMPND 7 CHAIN: A; COMPND 8 ENGINEERED: YES; COMPND 9 MOL_ID: 3; COMPND 10 MOLECULE: HEAT-LABILE ENTEROTOXIN, SUBUNIT A; COMPND 11 CHAIN: C; COMPND 12 ENGINEERED: YES

SOURCE MOL_ID: 1; SOURCE 2 ORGANISM_SCIENTIFIC: ESCHERICHIA COLI; SOURCE 3 ORGANISM_TAXID: 562; SOURCE 4 EXPRESSION_SYSTEM: ESCHERICHIA COLI; SOURCE 5 EXPRESSION_SYSTEM_TAXID: 562; SOURCE 6 EXPRESSION_SYSTEM_VECTOR_TYPE: PLASMID; SOURCE 7 EXPRESSION_SYSTEM_PLASMID: EWD299; SOURCE 8 MOL_ID: 2; SOURCE 9 ORGANISM_SCIENTIFIC: ESCHERICHIA COLI; SOURCE 10 ORGANISM_TAXID: 562; SOURCE 11 EXPRESSION_SYSTEM: ESCHERICHIA COLI; SOURCE 12 EXPRESSION_SYSTEM_TAXID: 562; SOURCE 13 EXPRESSION_SYSTEM_VECTOR_TYPE: PLASMID; SOURCE 14 EXPRESSION_SYSTEM_PLASMID: EWD299; SOURCE 15 MOL_ID: 3; SOURCE 16 ORGANISM_SCIENTIFIC: ESCHERICHIA COLI; SOURCE 17 ORGANISM_TAXID: 562; SOURCE 18 EXPRESSION_SYSTEM: ESCHERICHIA COLI; SOURCE 19 EXPRESSION_SYSTEM_TAXID: 562; SOURCE 20 EXPRESSION_SYSTEM_VECTOR_TYPE: PLASMID; SOURCE 21 EXPRESSION_SYSTEM_PLASMID: EWD299

KEYWDS ENTEROTOXIN

EXPDTA X-RAY DIFFRACTION

AUTHOR E.A.MERRITT,T.K.SIXMA,W.G.J.HOL

REVDAT 3 24-FEB-09 1LTB 1 VERSN REVDAT 2 31-JUL-94 1LTB 1 AUTHOR REVDAT 1 31-JAN-94 1LTB 0

JRNL AUTH E.A.MERRITT,S.E.PRONK,T.K.SIXMA,K.H.KALK, JRNL AUTH 2 B.A.VAN ZANTEN,W.G.HOL JRNL TITL STRUCTURE OF PARTIALLY-ACTIVATED E. COLI JRNL TITL 2 HEAT-LABILE ENTEROTOXIN (LT) AT 2.6 A RESOLUTION. JRNL REF FEBS LETT. V. 337 88 1994 JRNL REFN ISSN 0014-5793 JRNL PMID 8276119 JRNL DOI 10.1016/0014-5793(94)80635-7

REMARK 1 REMARK 1 REFERENCE 1 REMARK 1 AUTH T.K.SIXMA,K.H.KALK,B.A.M.VAN ZANTEN,Z.DAUTER, REMARK 1 AUTH 2 J.KINGMA,B.WITHOLT,W.G.J.HOL REMARK 1 TITL REFINED STRUCTURE OF ESCHERICHIA COLI HEAT-LABILE REMARK 1 TITL 2 ENTEROTOXIN, A CLOSE RELATIVE OF CHOLERA TOXIN REMARK 1 REF J.MOL.BIOL. V. 230 890 1993 REMARK 1 REFN ISSN 0022-2836 REMARK 1 REFERENCE 2 REMARK 1 AUTH T.K.SIXMA,S.E.PRONK,K.H.KALK,E.S.WARTNA, REMARK 1 AUTH 2 B.A.M.VAN ZANTEN,B.WITHOLT,W.G.J.HOL REMARK 1 TITL CRYSTAL STRUCTURE OF A CHOLERA TOXIN-RELATED REMARK 1 TITL 2 HEAT-LABILE ENTEROTOXIN FROM E. COLI REMARK 1 REF NATURE V. 351 371 1991 REMARK 1 REFN ISSN 0028-0836

REMARK 2 REMARK 2 RESOLUTION. 2.60 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) : 2.60 REMARK 3 RESOLUTION RANGE LOW (ANGSTROMS) : NULL REMARK 3 DATA CUTOFF (SIGMA(F)) : NULL REMARK 3 DATA CUTOFF HIGH (ABS(F)) : NULL REMARK 3 DATA CUTOFF LOW (ABS(F)) : NULL REMARK 3 COMPLETENESS (WORKING+TEST) (%) : NULL REMARK 3 NUMBER OF REFLECTIONS : NULL REMARK 3 REMARK 3 FIT TO DATA USED IN REFINEMENT. REMARK 3 CROSS-VALIDATION METHOD : NULL REMARK 3 FREE R VALUE TEST SET SELECTION : NULL REMARK 3 R VALUE (WORKING SET) : 0.172 REMARK 3 FREE R VALUE : NULL REMARK 3 FREE R VALUE TEST SET SIZE (%) : NULL 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) : NULL REMARK 3 BIN RESOLUTION RANGE LOW (A) : NULL REMARK 3 BIN COMPLETENESS (WORKING+TEST) (%) : NULL 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 : 5978 REMARK 3 NUCLEIC ACID ATOMS : 0 REMARK 3 HETEROGEN ATOMS : 0 REMARK 3 SOLVENT ATOMS : 197 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) : 0.015 REMARK 3 BOND ANGLES (DEGREES) : 3.24 REMARK 3 DIHEDRAL ANGLES (DEGREES) : NULL 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 : NULL REMARK 3 TOPOLOGY FILE 1 : NULL REMARK 3 REMARK 3 OTHER REFINEMENT REMARKS: NULL

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

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 : NULL REMARK 200 NUMBER OF CRYSTALS USED : NULL REMARK 200 REMARK 200 SYNCHROTRON (Y/N) : NULL REMARK 200 RADIATION SOURCE : NULL REMARK 200 BEAMLINE : NULL REMARK 200 X-RAY GENERATOR MODEL : NULL REMARK 200 MONOCHROMATIC OR LAUE (M/L) : NULL REMARK 200 WAVELENGTH OR RANGE (A) : NULL REMARK 200 MONOCHROMATOR : NULL REMARK 200 OPTICS : NULL REMARK 200 REMARK 200 DETECTOR TYPE : NULL REMARK 200 DETECTOR MANUFACTURER : NULL REMARK 200 INTENSITY-INTEGRATION SOFTWARE : NULL REMARK 200 DATA SCALING SOFTWARE : NULL REMARK 200 REMARK 200 NUMBER OF UNIQUE REFLECTIONS : NULL 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 : NULL REMARK 200 R MERGE (I) : NULL 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: NULL

REMARK 280 REMARK 280 CRYSTAL REMARK 280 SOLVENT CONTENT, VS (%): 44.32 REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 2.21 REMARK 280 REMARK 280 CRYSTALLIZATION CONDITIONS: NULL

REMARK 290 REMARK 290 CRYSTALLOGRAPHIC SYMMETRY REMARK 290 SYMMETRY OPERATORS FOR SPACE GROUP: P 21 21 21 REMARK 290 REMARK 290 SYMOP SYMMETRY REMARK 290 NNNMMM OPERATOR REMARK 290 1555 X,Y,Z REMARK 290 2555 -X+1/2,-Y,Z+1/2 REMARK 290 3555 -X,Y+1/2,-Z+1/2 REMARK 290 4555 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 59.60000 REMARK 290 SMTRY2 2 0.000000 -1.000000 0.000000 0.00000 REMARK 290 SMTRY3 2 0.000000 0.000000 1.000000 32.40000 REMARK 290 SMTRY1 3 -1.000000 0.000000 0.000000 0.00000 REMARK 290 SMTRY2 3 0.000000 1.000000 0.000000 49.10000 REMARK 290 SMTRY3 3 0.000000 0.000000 -1.000000 32.40000 REMARK 290 SMTRY1 4 1.000000 0.000000 0.000000 59.60000 REMARK 290 SMTRY2 4 0.000000 -1.000000 0.000000 49.10000 REMARK 290 SMTRY3 4 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 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: HEPTAMERIC REMARK 350 SOFTWARE DETERMINED QUATERNARY STRUCTURE: HEPTAMERIC REMARK 350 SOFTWARE USED: PISA REMARK 350 TOTAL BURIED SURFACE AREA: 19780 ANGSTROM**2 REMARK 350 SURFACE AREA OF THE COMPLEX: 28080 ANGSTROM**2 REMARK 350 CHANGE IN SOLVENT FREE ENERGY: -76.0 KCAL/MOL REMARK 350 APPLY THE FOLLOWING TO CHAINS: D, E, F, G, H, A, C 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 400 REMARK 400 COMPOUND REMARK 400 REMARK 400 THIS IS THE NICKED, UNREDUCED, FORM OF THE TOXIN. THE A REMARK 400 AND C CHAINS ARE LINKED BY A DISULFIDE BRIDGE BETWEEN A REMARK 400 187 AND C 199, BUT THE MAIN CHAIN BETWEEN THEM HAS BEEN REMARK 400 TRYPSIN-CLEAVED. THE MODEL IS INCOMPLETE IN THE REGION OF REMARK 400 THE CLEAVAGE SITE (189 - 195) DUE TO POOR ELECTRON DENSITY.

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 ARG C 192 REMARK 465 THR C 193 REMARK 465 ILE C 194 REMARK 465 THR C 195

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 OG1 THR D 6 O HOH H 131 3555 2.17 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 HIS D 57 NE2 HIS D 57 CD2 -0.077 REMARK 500 HIS E 57 NE2 HIS E 57 CD2 -0.074 REMARK 500 HIS F 57 NE2 HIS F 57 CD2 -0.070 REMARK 500 HIS H 57 NE2 HIS H 57 CD2 -0.072 REMARK 500 HIS A 27 NE2 HIS A 27 CD2 -0.067 REMARK 500 HIS A 70 NE2 HIS A 70 CD2 -0.075 REMARK 500 HIS A 181 NE2 HIS A 181 CD2 -0.072 REMARK 500 HIS A 182 NE2 HIS A 182 CD2 -0.067 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 TYR D 12 CB - CG - CD1 ANGL. DEV. = -4.2 DEGREES REMARK 500 TYR D 76 CB - CG - CD2 ANGL. DEV. = -3.8 DEGREES REMARK 500 TRP D 88 CD1 - CG - CD2 ANGL. DEV. = 6.9 DEGREES REMARK 500 TRP D 88 CE2 - CD2 - CG ANGL. DEV. = -6.0 DEGREES REMARK 500 SER D 95 N - CA - CB ANGL. DEV. = -9.2 DEGREES REMARK 500 LYS D 102 CA - C - N ANGL. DEV. = -16.1 DEGREES REMARK 500 LYS D 102 O - C - N ANGL. DEV. = 9.9 DEGREES REMARK 500 TYR E 27 CB - CG - CD2 ANGL. DEV. = -4.4 DEGREES REMARK 500 VAL E 50 N - CA - C ANGL. DEV. = -16.3 DEGREES REMARK 500 ARG E 73 NE - CZ - NH1 ANGL. DEV. = 3.4 DEGREES REMARK 500 TYR E 76 CB - CG - CD2 ANGL. DEV. = -4.3 DEGREES REMARK 500 TRP E 88 CD1 - CG - CD2 ANGL. DEV. = 5.0 DEGREES REMARK 500 TRP E 88 CE2 - CD2 - CG ANGL. DEV. = -5.0 DEGREES REMARK 500 ARG F 13 NE - CZ - NH1 ANGL. DEV. = 3.2 DEGREES REMARK 500 ARG F 67 NE - CZ - NH2 ANGL. DEV. = -4.2 DEGREES REMARK 500 TRP F 88 CD1 - CG - CD2 ANGL. DEV. = 7.6 DEGREES REMARK 500 TRP F 88 CB - CG - CD1 ANGL. DEV. = -9.2 DEGREES REMARK 500 TRP F 88 CG - CD1 - NE1 ANGL. DEV. = -6.0 DEGREES REMARK 500 TRP F 88 CE2 - CD2 - CG ANGL. DEV. = -6.4 DEGREES REMARK 500 TRP F 88 CG - CD2 - CE3 ANGL. DEV. = 6.0 DEGREES REMARK 500 ARG G 13 NE - CZ - NH2 ANGL. DEV. = -3.3 DEGREES REMARK 500 ASP G 70 CB - CG - OD1 ANGL. DEV. = 6.3 DEGREES REMARK 500 TRP G 88 CD1 - CG - CD2 ANGL. DEV. = 7.2 DEGREES REMARK 500 TRP G 88 CE2 - CD2 - CG ANGL. DEV. = -5.8 DEGREES REMARK 500 ARG H 13 NE - CZ - NH2 ANGL. DEV. = -3.5 DEGREES REMARK 500 ARG H 67 NE - CZ - NH2 ANGL. DEV. = -4.1 DEGREES REMARK 500 ARG H 73 NE - CZ - NH1 ANGL. DEV. = 6.3 DEGREES REMARK 500 TYR H 76 CB - CG - CD1 ANGL. DEV. = -3.7 DEGREES REMARK 500 TRP H 88 CD1 - CG - CD2 ANGL. DEV. = 6.5 DEGREES REMARK 500 TRP H 88 CE2 - CD2 - CG ANGL. DEV. = -5.6 DEGREES REMARK 500 ARG A 4 NE - CZ - NH1 ANGL. DEV. = 3.5 DEGREES REMARK 500 ARG A 4 NE - CZ - NH2 ANGL. DEV. = -3.1 DEGREES REMARK 500 ARG A 18 NE - CZ - NH1 ANGL. DEV. = 3.9 DEGREES REMARK 500 ARG A 18 NE - CZ - NH2 ANGL. DEV. = -4.1 DEGREES REMARK 500 ARG A 25 NE - CZ - NH1 ANGL. DEV. = 3.9 DEGREES REMARK 500 ARG A 25 NE - CZ - NH2 ANGL. DEV. = -3.4 DEGREES REMARK 500 ARG A 33 NE - CZ - NH1 ANGL. DEV. = 3.7 DEGREES REMARK 500 ARG A 46 NE - CZ - NH2 ANGL. DEV. = -3.1 DEGREES REMARK 500 TYR A 55 CB - CG - CD2 ANGL. DEV. = -4.8 DEGREES REMARK 500 TYR A 59 CB - CG - CD2 ANGL. DEV. = -5.7 DEGREES REMARK 500 ARG A 67 NE - CZ - NH1 ANGL. DEV. = 3.6 DEGREES REMARK 500 MET A 94 CA - CB - CG ANGL. DEV. = 11.7 DEGREES REMARK 500 TRP A 127 CD1 - CG - CD2 ANGL. DEV. = 7.2 DEGREES REMARK 500 TRP A 127 CG - CD1 - NE1 ANGL. DEV. = -6.2 DEGREES REMARK 500 TRP A 127 CE2 - CD2 - CG ANGL. DEV. = -5.9 DEGREES REMARK 500 TYR A 128 CB - CG - CD1 ANGL. DEV. = -4.0 DEGREES REMARK 500 ARG A 143 NE - CZ - NH1 ANGL. DEV. = 3.9 DEGREES REMARK 500 ARG A 143 NE - CZ - NH2 ANGL. DEV. = -3.1 DEGREES REMARK 500 TYR A 145 CB - CG - CD2 ANGL. DEV. = -4.2 DEGREES REMARK 500 ARG A 146 NE - CZ - NH1 ANGL. DEV. = 3.1 DEGREES REMARK 500 REMARK 500 THIS ENTRY HAS 66 ANGLE DEVIATIONS. 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 LYS D 34 -2.76 70.14 REMARK 500 GLN D 56 12.33 -62.59 REMARK 500 ASN E 14 30.13 74.32 REMARK 500 ASN E 21 57.13 36.45 REMARK 500 ASP E 83 -71.10 -86.55 REMARK 500 ASN F 21 49.75 34.81 REMARK 500 SER F 44 -9.83 -53.50 REMARK 500 PRO F 53 89.52 -57.43 REMARK 500 GLN F 56 3.63 -69.28 REMARK 500 GLU F 79 36.79 71.29 REMARK 500 ASP F 83 -70.27 -83.47 REMARK 500 SER G 10 7.17 -68.10 REMARK 500 ASN G 14 37.50 78.62 REMARK 500 ASN G 21 56.51 36.68 REMARK 500 LYS G 34 -18.78 76.43 REMARK 500 ARG G 35 58.64 -119.19 REMARK 500 ILE H 20 -61.22 -103.09 REMARK 500 LYS H 34 -6.33 72.15 REMARK 500 SER H 55 79.65 -108.77 REMARK 500 GLN H 56 5.39 -156.46 REMARK 500 ASN H 90 37.34 -83.34 REMARK 500 ASN H 94 151.74 -48.39 REMARK 500 PRO A 24 170.49 -59.01 REMARK 500 ARG A 54 107.95 -37.53 REMARK 500 VAL A 103 -8.00 -59.74 REMARK 500 GLN A 172 -36.04 -38.71 REMARK 500 HIS A 182 10.64 -143.85 REMARK 500 PRO A 184 170.80 -55.88 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 TYR A 128 0.07 SIDE_CHAIN REMARK 500 REMARK 500 REMARK: NULL

REMARK 700 REMARK 700 SHEET REMARK 700 IN THE PENTAMER THE BETA SHEETS FROM ADJACENT MONOMERS REMARK 700 COMBINE TO FORM A CONTINUOUS SIX-STRANDED ANTI-PARALLEL REMARK 700 SHEET ACROSS EACH MONOMER-MONOMER INTERFACE.

DBREF 1LTB D 1 103 UNP P32890 ELBP_ECOLI 22 124 DBREF 1LTB E 1 103 UNP P32890 ELBP_ECOLI 22 124 DBREF 1LTB F 1 103 UNP P32890 ELBP_ECOLI 22 124 DBREF 1LTB G 1 103 UNP P32890 ELBP_ECOLI 22 124 DBREF 1LTB H 1 103 UNP P32890 ELBP_ECOLI 22 124 DBREF 1LTB A 4 188 UNP P06717 ELAP_ECOLI 22 206 DBREF 1LTB C 192 236 UNP P06717 ELAP_ECOLI 210 254

SEQRES 1 D 103 ALA PRO GLN THR ILE THR GLU LEU CYS SER GLU TYR ARG SEQRES 2 D 103 ASN THR GLN ILE TYR THR ILE ASN ASP LYS ILE LEU SER SEQRES 3 D 103 TYR THR GLU SER MET ALA GLY LYS ARG GLU MET VAL ILE SEQRES 4 D 103 ILE THR PHE LYS SER GLY GLU THR PHE GLN VAL GLU VAL SEQRES 5 D 103 PRO GLY SER GLN HIS ILE ASP SER GLN LYS LYS ALA ILE SEQRES 6 D 103 GLU ARG MET LYS ASP THR LEU ARG ILE THR TYR LEU THR SEQRES 7 D 103 GLU THR LYS ILE ASP LYS LEU CYS VAL TRP ASN ASN LYS SEQRES 8 D 103 THR PRO ASN SER ILE ALA ALA ILE SER MET LYS ASN SEQRES 1 E 103 ALA PRO GLN THR ILE THR GLU LEU CYS SER GLU TYR ARG SEQRES 2 E 103 ASN THR GLN ILE TYR THR ILE ASN ASP LYS ILE LEU SER SEQRES 3 E 103 TYR THR GLU SER MET ALA GLY LYS ARG GLU MET VAL ILE SEQRES 4 E 103 ILE THR PHE LYS SER GLY GLU THR PHE GLN VAL GLU VAL SEQRES 5 E 103 PRO GLY SER GLN HIS ILE ASP SER GLN LYS LYS ALA ILE SEQRES 6 E 103 GLU ARG MET LYS ASP THR LEU ARG ILE THR TYR LEU THR SEQRES 7 E 103 GLU THR LYS ILE ASP LYS LEU CYS VAL TRP ASN ASN LYS SEQRES 8 E 103 THR PRO ASN SER ILE ALA ALA ILE SER MET LYS ASN SEQRES 1 F 103 ALA PRO GLN THR ILE THR GLU LEU CYS SER GLU TYR ARG SEQRES 2 F 103 ASN THR GLN ILE TYR THR ILE ASN ASP LYS ILE LEU SER SEQRES 3 F 103 TYR THR GLU SER MET ALA GLY LYS ARG GLU MET VAL ILE SEQRES 4 F 103 ILE THR PHE LYS SER GLY GLU THR PHE GLN VAL GLU VAL SEQRES 5 F 103 PRO GLY SER GLN HIS ILE ASP SER GLN LYS LYS ALA ILE SEQRES 6 F 103 GLU ARG MET LYS ASP THR LEU ARG ILE THR TYR LEU THR SEQRES 7 F 103 GLU THR LYS ILE ASP LYS LEU CYS VAL TRP ASN ASN LYS SEQRES 8 F 103 THR PRO ASN SER ILE ALA ALA ILE SER MET LYS ASN SEQRES 1 G 103 ALA PRO GLN THR ILE THR GLU LEU CYS SER GLU TYR ARG SEQRES 2 G 103 ASN THR GLN ILE TYR THR ILE ASN ASP LYS ILE LEU SER SEQRES 3 G 103 TYR THR GLU SER MET ALA GLY LYS ARG GLU MET VAL ILE SEQRES 4 G 103 ILE THR PHE LYS SER GLY GLU THR PHE GLN VAL GLU VAL SEQRES 5 G 103 PRO GLY SER GLN HIS ILE ASP SER GLN LYS LYS ALA ILE SEQRES 6 G 103 GLU ARG MET LYS ASP THR LEU ARG ILE THR TYR LEU THR SEQRES 7 G 103 GLU THR LYS ILE ASP LYS LEU CYS VAL TRP ASN ASN LYS SEQRES 8 G 103 THR PRO ASN SER ILE ALA ALA ILE SER MET LYS ASN SEQRES 1 H 103 ALA PRO GLN THR ILE THR GLU LEU CYS SER GLU TYR ARG SEQRES 2 H 103 ASN THR GLN ILE TYR THR ILE ASN ASP LYS ILE LEU SER SEQRES 3 H 103 TYR THR GLU SER MET ALA GLY LYS ARG GLU MET VAL ILE SEQRES 4 H 103 ILE THR PHE LYS SER GLY GLU THR PHE GLN VAL GLU VAL SEQRES 5 H 103 PRO GLY SER GLN HIS ILE ASP SER GLN LYS LYS ALA ILE SEQRES 6 H 103 GLU ARG MET LYS ASP THR LEU ARG ILE THR TYR LEU THR SEQRES 7 H 103 GLU THR LYS ILE ASP LYS LEU CYS VAL TRP ASN ASN LYS SEQRES 8 H 103 THR PRO ASN SER ILE ALA ALA ILE SER MET LYS ASN SEQRES 1 A 185 ARG LEU TYR ARG ALA ASP SER ARG PRO PRO ASP GLU ILE SEQRES 2 A 185 LYS ARG SER GLY GLY LEU MET PRO ARG GLY HIS ASN GLU SEQRES 3 A 185 TYR PHE ASP ARG GLY THR GLN MET ASN ILE ASN LEU TYR SEQRES 4 A 185 ASP HIS ALA ARG GLY THR GLN THR GLY PHE VAL ARG TYR SEQRES 5 A 185 ASP ASP GLY TYR VAL SER THR SER LEU SER LEU ARG SER SEQRES 6 A 185 ALA HIS LEU ALA GLY GLN SER ILE LEU SER GLY TYR SER SEQRES 7 A 185 THR TYR TYR ILE TYR VAL ILE ALA THR ALA PRO ASN MET SEQRES 8 A 185 PHE ASN VAL ASN ASP VAL LEU GLY VAL TYR SER PRO HIS SEQRES 9 A 185 PRO TYR GLU GLN GLU VAL SER ALA LEU GLY GLY ILE PRO SEQRES 10 A 185 TYR SER GLN ILE TYR GLY TRP TYR ARG VAL ASN PHE GLY SEQRES 11 A 185 VAL ILE ASP GLU ARG LEU HIS ARG ASN ARG GLU TYR ARG SEQRES 12 A 185 ASP ARG TYR TYR ARG ASN LEU ASN ILE ALA PRO ALA GLU SEQRES 13 A 185 ASP GLY TYR ARG LEU ALA GLY PHE PRO PRO ASP HIS GLN SEQRES 14 A 185 ALA TRP ARG GLU GLU PRO TRP ILE HIS HIS ALA PRO GLN SEQRES 15 A 185 GLY CYS GLY SEQRES 1 C 45 ARG THR ILE THR GLY ASP THR CYS ASN GLU GLU THR GLN SEQRES 2 C 45 ASN LEU SER THR ILE TYR LEU ARG GLU TYR GLN SER LYS SEQRES 3 C 45 VAL LYS ARG GLN ILE PHE SER ASP TYR GLN SER GLU VAL SEQRES 4 C 45 ASP ILE TYR ASN ARG ILE

FORMUL 8 HOH *197(H2 O)

HELIX 1 DA1 ILE D 5 CYS D 9 1 5 HELIX 2 DA2 GLN D 61 THR D 78 1 18 HELIX 3 EA1 ILE E 5 SER E 10 1 6 HELIX 4 EA2 ASP E 59 LEU E 77 1 19 HELIX 5 FA1 ILE F 5 CYS F 9 1 5 HELIX 6 FA2 ASP F 59 THR F 78 1 20 HELIX 7 GA1 ILE G 5 CYS G 9 1 5 HELIX 8 GA2 ASP G 59 LEU G 77 1 19 HELIX 9 HA1 ILE H 5 CYS H 9 1 5 HELIX 10 HA2 ASP H 59 THR H 78 1 20 HELIX 11 AA1 PRO A 13 ARG A 18 1 6 HELIX 12 AA2 LEU A 41 ARG A 46 1 6 HELIX 13 AA3 LEU A 66 ILE A 76 1 11 HELIX 14 AA4 VAL A 97 LEU A 101 1 5 HELIX 15 AA5 GLY A 102 TYR A 104 5 3 HELIX 16 AA6 PRO A 108 GLU A 110 5 3 HELIX 17 AA7 TYR A 121 GLN A 123 5 3 HELIX 18 AA8 ASP A 147 TYR A 150 1 4 HELIX 19 AA9 ALA A 158 TYR A 162 1 5 HELIX 20 A11 GLN A 172 ARG A 175 5 4 HELIX 21 A12 TRP A 179 HIS A 182 5 4 HELIX 22 CA1 ASP C 197 ILE C 222 1 26 HELIX 23 CA2 PHE C 223 TYR C 226 5 4 HELIX 24 CA3 ILE C 232 ARG C 235 1 4

SHEET 1 BB1 6 THR D 15 ASP D 22 0 SHEET 2 BB1 6 ILE D 82 TRP D 88 -1 SHEET 3 BB1 6 ASN D 94 LYS D 102 -1 SHEET 4 BB1 6 SER E 26 SER E 30 -1 SHEET 5 BB1 6 MET E 37 THR E 41 -1 SHEET 6 BB1 6 THR E 47 VAL E 50 -1 SHEET 1 BB2 6 THR E 15 ASP E 22 0 SHEET 2 BB2 6 ILE E 82 TRP E 88 -1 SHEET 3 BB2 6 ASN E 94 LYS E 102 -1 SHEET 4 BB2 6 SER F 26 SER F 30 -1 SHEET 5 BB2 6 MET F 37 THR F 41 -1 SHEET 6 BB2 6 THR F 47 VAL F 50 -1 SHEET 1 BB3 6 THR F 15 ASP F 22 0 SHEET 2 BB3 6 ILE F 82 TRP F 88 -1 SHEET 3 BB3 6 ASN F 94 LYS F 102 -1 SHEET 4 BB3 6 SER G 26 SER G 30 -1 SHEET 5 BB3 6 MET G 37 THR G 41 -1 SHEET 6 BB3 6 THR G 47 VAL G 50 -1 SHEET 1 BB4 6 THR G 15 ASP G 22 0 SHEET 2 BB4 6 ILE G 82 TRP G 88 -1 SHEET 3 BB4 6 ASN G 94 LYS G 102 -1 SHEET 4 BB4 6 SER H 26 SER H 30 -1 SHEET 5 BB4 6 MET H 37 THR H 41 -1 SHEET 6 BB4 6 THR H 47 VAL H 50 -1 SHEET 1 BB5 6 THR H 15 ASP H 22 0 SHEET 2 BB5 6 ILE H 82 TRP H 88 -1 SHEET 3 BB5 6 ASN H 94 LYS H 102 -1 SHEET 4 BB5 6 SER D 26 SER D 30 -1 SHEET 5 BB5 6 MET D 37 THR D 41 -1 SHEET 6 BB5 6 THR D 47 VAL D 50 -1 SHEET 1 BA1 7 MET A 94 ASN A 96 0 SHEET 2 BA1 7 GLU A 112 LEU A 116 -1 SHEET 3 BA1 7 TYR A 59 SER A 63 -1 SHEET 4 BA1 7 ARG A 4 ASP A 9 -1 SHEET 5 BA1 7 THR A 82 ALA A 89 -1 SHEET 6 BA1 7 ILE A 124 ASN A 131 -1 SHEET 7 BA1 7 VAL A 134 ARG A 141 -1

SSBOND 1 CYS D 9 CYS D 86 1555 1555 2.02 SSBOND 2 CYS E 9 CYS E 86 1555 1555 1.99 SSBOND 3 CYS F 9 CYS F 86 1555 1555 1.99 SSBOND 4 CYS G 9 CYS G 86 1555 1555 1.99 SSBOND 5 CYS H 9 CYS H 86 1555 1555 2.02 SSBOND 6 CYS A 187 CYS C 199 1555 1555 2.02

CISPEP 1 THR D 92 PRO D 93 0 -6.40 CISPEP 2 THR E 92 PRO E 93 0 2.82 CISPEP 3 THR F 92 PRO F 93 0 -8.73 CISPEP 4 THR G 92 PRO G 93 0 -18.30 CISPEP 5 THR H 92 PRO H 93 0 -13.10 CISPEP 6 GLU A 177 PRO A 178 0 -2.52

CRYST1 119.200 98.200 64.800 90.00 90.00 90.00 P 21 21 21 20

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 0.008389 0.000000 0.000000 0.00000

SCALE2 0.000000 0.010183 0.000000 0.00000

SCALE3 0.000000 0.000000 0.015432 0.00000