HEADER LACTOSE SYNTHASE 05-FEB-98 1A4V TITLE ALPHA-LACTALBUMIN COMPND MOL_ID: 1; COMPND 2 MOLECULE: ALPHA-LACTALBUMIN; COMPND 3 CHAIN: A; COMPND 4 FRAGMENT: CALCIUM-BINDING REGION; COMPND 5 SYNONYM: ALPHA-LA; COMPND 6 EC: 2.4.1.22 SOURCE MOL_ID: 1; SOURCE 2 ORGANISM_SCIENTIFIC: HOMO SAPIENS; SOURCE 3 ORGANISM_COMMON: HUMAN; SOURCE 4 ORGANISM_TAXID: 9606; SOURCE 5 SECRETION: MILK; SOURCE 6 CELLULAR_LOCATION: TRANS-GOLGI APPARATUS OF THE MAMMARY GLAND KEYWDS LACTOSE SYNTHASE, CALCIUM BINDING, ALPHA-LACTALBUMIN EXPDTA X-RAY DIFFRACTION AUTHOR N.CHANDRA,K.R.ACHARYA REVDAT 4 23-OCT-24 1A4V 1 REMARK REVDAT 3 05-JUN-24 1A4V 1 REMARK LINK REVDAT 2 24-FEB-09 1A4V 1 VERSN REVDAT 1 27-APR-99 1A4V 0 JRNL AUTH N.CHANDRA,K.BREW,K.R.ACHARYA JRNL TITL STRUCTURAL EVIDENCE FOR THE PRESENCE OF A SECONDARY CALCIUM JRNL TITL 2 BINDING SITE IN HUMAN ALPHA-LACTALBUMIN. JRNL REF BIOCHEMISTRY V. 37 4767 1998 JRNL REFN ISSN 0006-2960 JRNL PMID 9537992 JRNL DOI 10.1021/BI973000T REMARK 1 REMARK 1 REFERENCE 1 REMARK 1 AUTH A.C.PIKE,K.BREW,K.R.ACHARYA REMARK 1 TITL CRYSTAL STRUCTURES OF GUINEA-PIG, GOAT AND BOVINE REMARK 1 TITL 2 ALPHA-LACTALBUMIN HIGHLIGHT THE ENHANCED CONFORMATIONAL REMARK 1 TITL 3 FLEXIBILITY OF REGIONS THAT ARE SIGNIFICANT FOR ITS ACTION REMARK 1 TITL 4 IN LACTOSE SYNTHASE REMARK 1 REF STRUCTURE V. 4 691 1996 REMARK 1 REFN ISSN 0969-2126 REMARK 1 REFERENCE 2 REMARK 1 AUTH J.A.GROBLER,M.WANG,A.C.PIKE,K.BREW REMARK 1 TITL STUDY BY MUTAGENESIS OF THE ROLES OF TWO AROMATIC CLUSTERS REMARK 1 TITL 2 OF ALPHA-LACTALBUMIN IN ASPECTS OF ITS ACTION IN THE LACTOSE REMARK 1 TITL 3 SYNTHASE SYSTEM REMARK 1 REF J.BIOL.CHEM. V. 269 5106 1994 REMARK 1 REFN ISSN 0021-9258 REMARK 1 REFERENCE 3 REMARK 1 AUTH J.REN,D.I.STUART,K.R.ACHARYA REMARK 1 TITL ALPHA-LACTALBUMIN POSSESSES A DISTINCT ZINC BINDING SITE REMARK 1 REF J.BIOL.CHEM. V. 268 19292 1993 REMARK 1 REFN ISSN 0021-9258 REMARK 1 REFERENCE 4 REMARK 1 AUTH K.R.ACHARYA,J.S.REN,D.I.STUART,D.C.PHILLIPS,R.E.FENNA REMARK 1 TITL CRYSTAL STRUCTURE OF HUMAN ALPHA-LACTALBUMIN AT 1.7 A REMARK 1 TITL 2 RESOLUTION REMARK 1 REF J.MOL.BIOL. V. 221 571 1991 REMARK 1 REFN ISSN 0022-2836 REMARK 2 REMARK 2 RESOLUTION. 1.80 ANGSTROMS. REMARK 3 REMARK 3 REFINEMENT. REMARK 3 PROGRAM : X-PLOR 3.1 REMARK 3 AUTHORS : BRUNGER REMARK 3 REMARK 3 DATA USED IN REFINEMENT. REMARK 3 RESOLUTION RANGE HIGH (ANGSTROMS) : 1.80 REMARK 3 RESOLUTION RANGE LOW (ANGSTROMS) : 8.00 REMARK 3 DATA CUTOFF (SIGMA(F)) : 2.000 REMARK 3 DATA CUTOFF HIGH (ABS(F)) : 10000000.000 REMARK 3 DATA CUTOFF LOW (ABS(F)) : 0.0010 REMARK 3 COMPLETENESS (WORKING+TEST) (%) : 82.0 REMARK 3 NUMBER OF REFLECTIONS : 8907 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 SET) : 0.210 REMARK 3 FREE R VALUE : 0.263 REMARK 3 FREE R VALUE TEST SET SIZE (%) : 5.400 REMARK 3 FREE R VALUE TEST SET COUNT : 424 REMARK 3 ESTIMATED ERROR OF FREE R VALUE : 0.012 REMARK 3 REMARK 3 FIT IN THE HIGHEST RESOLUTION BIN. REMARK 3 TOTAL NUMBER OF BINS USED : 10 REMARK 3 BIN RESOLUTION RANGE HIGH (A) : 1.80 REMARK 3 BIN RESOLUTION RANGE LOW (A) : 1.86 REMARK 3 BIN COMPLETENESS (WORKING+TEST) (%) : 15.50 REMARK 3 REFLECTIONS IN BIN (WORKING SET) : 161 REMARK 3 BIN R VALUE (WORKING SET) : 0.2430 REMARK 3 BIN FREE R VALUE : 0.1780 REMARK 3 BIN FREE R VALUE TEST SET SIZE (%) : 4.20 REMARK 3 BIN FREE R VALUE TEST SET COUNT : 7 REMARK 3 ESTIMATED ERROR OF BIN FREE R VALUE : 0.067 REMARK 3 REMARK 3 NUMBER OF NON-HYDROGEN ATOMS USED IN REFINEMENT. REMARK 3 PROTEIN ATOMS : 983 REMARK 3 NUCLEIC ACID ATOMS : 0 REMARK 3 HETEROGEN ATOMS : 2 REMARK 3 SOLVENT ATOMS : 106 REMARK 3 REMARK 3 B VALUES. REMARK 3 FROM WILSON PLOT (A**2) : 5.60 REMARK 3 MEAN B VALUE (OVERALL, A**2) : 16.80 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) : 0.20 REMARK 3 ESD FROM SIGMAA (A) : 0.17 REMARK 3 LOW RESOLUTION CUTOFF (A) : 5.00 REMARK 3 REMARK 3 CROSS-VALIDATED ESTIMATED COORDINATE ERROR. REMARK 3 ESD FROM C-V LUZZATI PLOT (A) : 0.26 REMARK 3 ESD FROM C-V SIGMAA (A) : 0.22 REMARK 3 REMARK 3 RMS DEVIATIONS FROM IDEAL VALUES. REMARK 3 BOND LENGTHS (A) : 0.011 REMARK 3 BOND ANGLES (DEGREES) : 1.400 REMARK 3 DIHEDRAL ANGLES (DEGREES) : 24.40 REMARK 3 IMPROPER ANGLES (DEGREES) : 2.150 REMARK 3 REMARK 3 ISOTROPIC THERMAL MODEL : ISOTROPIC 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 : PARAM19X.PRO REMARK 3 PARAMETER FILE 2 : PARAM.WATER REMARK 3 PARAMETER FILE 3 : PARAM.CAL REMARK 3 PARAMETER FILE 4 : TOPH19X.PRO REMARK 3 PARAMETER FILE 5 : NULL REMARK 3 TOPOLOGY FILE 1 : TOPOW.WATER REMARK 3 TOPOLOGY FILE 2 : TOP.CAL REMARK 3 TOPOLOGY FILE 3 : NULL REMARK 3 TOPOLOGY FILE 4 : NULL REMARK 3 TOPOLOGY FILE 5 : NULL REMARK 3 REMARK 3 OTHER REFINEMENT REMARKS: NULL REMARK 4 REMARK 4 1A4V COMPLIES WITH FORMAT V. 3.30, 13-JUL-11 REMARK 100 REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY BNL. REMARK 100 THE DEPOSITION ID IS D_1000170394. REMARK 200 REMARK 200 EXPERIMENTAL DETAILS REMARK 200 EXPERIMENT TYPE : X-RAY DIFFRACTION REMARK 200 DATE OF DATA COLLECTION : JAN-92 REMARK 200 TEMPERATURE (KELVIN) : 293 REMARK 200 PH : 7.5 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 : SIEMENS REMARK 200 MONOCHROMATIC OR LAUE (M/L) : M REMARK 200 WAVELENGTH OR RANGE (A) : 1.5418 REMARK 200 MONOCHROMATOR : GRAPHITE(002) REMARK 200 OPTICS : COLLIMATOR REMARK 200 REMARK 200 DETECTOR TYPE : AREA DETECTOR REMARK 200 DETECTOR MANUFACTURER : SIEMENS REMARK 200 INTENSITY-INTEGRATION SOFTWARE : XENGEN REMARK 200 DATA SCALING SOFTWARE : XENGEN REMARK 200 REMARK 200 NUMBER OF UNIQUE REFLECTIONS : 9928 REMARK 200 RESOLUTION RANGE HIGH (A) : 1.800 REMARK 200 RESOLUTION RANGE LOW (A) : 8.000 REMARK 200 REJECTION CRITERIA (SIGMA(I)) : -3.000 REMARK 200 REMARK 200 OVERALL. REMARK 200 COMPLETENESS FOR RANGE (%) : 82.0 REMARK 200 DATA REDUNDANCY : 4.100 REMARK 200 R MERGE (I) : NULL REMARK 200 R SYM (I) : 0.06990 REMARK 200 <I/SIGMA(I)> FOR THE DATA SET : 14.3300 REMARK 200 REMARK 200 IN THE HIGHEST RESOLUTION SHELL. REMARK 200 HIGHEST RESOLUTION SHELL, RANGE HIGH (A) : 1.80 REMARK 200 HIGHEST RESOLUTION SHELL, RANGE LOW (A) : 1.90 REMARK 200 COMPLETENESS FOR SHELL (%) : 64.0 REMARK 200 DATA REDUNDANCY IN SHELL : 0.31 REMARK 200 R MERGE FOR SHELL (I) : NULL REMARK 200 R SYM FOR SHELL (I) : 0.33700 REMARK 200 <I/SIGMA(I)> FOR SHELL : 1.030 REMARK 200 REMARK 200 DIFFRACTION PROTOCOL: NULL REMARK 200 METHOD USED TO DETERMINE THE STRUCTURE: NULL REMARK 200 SOFTWARE USED: X-PLOR 3.1 REMARK 200 STARTING MODEL: NULL REMARK 200 REMARK 200 REMARK: NULL REMARK 280 REMARK 280 CRYSTAL REMARK 280 SOLVENT CONTENT, VS (%): 38.00 REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 1.99 REMARK 280 REMARK 280 CRYSTALLIZATION CONDITIONS: PH 7.5 REMARK 290 REMARK 290 CRYSTALLOGRAPHIC SYMMETRY REMARK 290 SYMMETRY OPERATORS FOR SPACE GROUP: P 21 21 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+1/2,Y+1/2,-Z 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 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 17.73500 REMARK 290 SMTRY2 3 0.000000 1.000000 0.000000 34.78000 REMARK 290 SMTRY3 3 0.000000 0.000000 -1.000000 0.00000 REMARK 290 SMTRY1 4 1.000000 0.000000 0.000000 17.73500 REMARK 290 SMTRY2 4 0.000000 -1.000000 0.000000 34.78000 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: MONOMERIC 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 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 NE2 GLN A 39 O HOH A 209 4556 2.00 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 LEU A 23 CA - CB - CG ANGL. DEV. = 14.5 DEGREES REMARK 500 LEU A 59 CA - CB - CG ANGL. DEV. = 16.6 DEGREES REMARK 500 LEU A 105 CA - CB - CG ANGL. DEV. = 14.9 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 ASN A 44 -110.50 -137.65 REMARK 500 ASN A 45 -85.33 -92.86 REMARK 500 LEU A 59 -33.46 -146.15 REMARK 500 ASP A 102 1.08 -65.49 REMARK 500 GLU A 121 -104.70 -62.60 REMARK 500 REMARK 500 REMARK: NULL 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 CA A 125 CA REMARK 620 N RES CSSEQI ATOM REMARK 620 1 THR A 38 OG1 REMARK 620 2 GLN A 39 OE1 112.8 REMARK 620 3 LEU A 81 O 96.7 95.6 REMARK 620 4 ASP A 83 OD1 103.7 113.0 134.0 REMARK 620 N 1 2 3 REMARK 620 REMARK 620 COORDINATION ANGLES FOR: M RES CSSEQI METAL REMARK 620 CA A 124 CA REMARK 620 N RES CSSEQI ATOM REMARK 620 1 LYS A 79 O REMARK 620 2 ASP A 82 OD1 89.5 REMARK 620 3 ASP A 84 O 173.0 84.0 REMARK 620 4 ASP A 87 OD1 87.2 147.7 97.0 REMARK 620 5 ASP A 88 OD1 98.0 144.4 88.8 67.8 REMARK 620 6 HOH A 134 O 91.9 74.3 88.8 137.9 70.7 REMARK 620 7 HOH A 150 O 88.9 73.4 86.8 74.4 141.1 147.7 REMARK 620 N 1 2 3 4 5 6 REMARK 800 REMARK 800 SITE REMARK 800 SITE_IDENTIFIER: CB1 REMARK 800 EVIDENCE_CODE: UNKNOWN REMARK 800 SITE_DESCRIPTION: CALCIUM BINDING SITE IN THE CALCIUM-BINDING REMARK 800 -ELBOW REGION IS REFERRED TO AS THE PRIMARY CALCIUM BINDING REMARK 800 SITE. AT THIS SITE THE CALCIUM IS HAVING PENTAGONAL BYPYRAMIDAL REMARK 800 COORDINATION. REMARK 800 REMARK 800 SITE_IDENTIFIER: CB2 REMARK 800 EVIDENCE_CODE: UNKNOWN REMARK 800 SITE_DESCRIPTION: THIS IS THE SECONDARY CALCIUM BINDING SITE. AT REMARK 800 THIS SITE THE CALCIUM ION HAS TETRAHEDRAL COORDINATION. REMARK 800 REMARK 800 SITE_IDENTIFIER: AC1 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE CA A 124 REMARK 800 REMARK 800 SITE_IDENTIFIER: AC2 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE CA A 125 DBREF 1A4V A 1 123 UNP P00709 LALBA_HUMAN 20 142 SEQRES 1 A 123 LYS GLN PHE THR LYS CYS GLU LEU SER GLN LEU LEU LYS SEQRES 2 A 123 ASP ILE ASP GLY TYR GLY GLY ILE ALA LEU PRO GLU LEU SEQRES 3 A 123 ILE CYS THR MET PHE HIS THR SER GLY TYR ASP THR GLN SEQRES 4 A 123 ALA ILE VAL GLU ASN ASN GLU SER THR GLU TYR GLY LEU SEQRES 5 A 123 PHE GLN ILE SER ASN LYS LEU TRP CYS LYS SER SER GLN SEQRES 6 A 123 VAL PRO GLN SER ARG ASN ILE CYS ASP ILE SER CYS ASP SEQRES 7 A 123 LYS PHE LEU ASP ASP ASP ILE THR ASP ASP ILE MET CYS SEQRES 8 A 123 ALA LYS LYS ILE LEU ASP ILE LYS GLY ILE ASP TYR TRP SEQRES 9 A 123 LEU ALA HIS LYS ALA LEU CYS THR GLU LYS LEU GLU GLN SEQRES 10 A 123 TRP LEU CYS GLU LYS LEU HET CA A 124 1 HET CA A 125 1 HETNAM CA CALCIUM ION FORMUL 2 CA 2(CA 2+) FORMUL 4 HOH *106(H2 O) HELIX 1 1 LYS A 5 ILE A 15 1 11 HELIX 2 2 TYR A 18 GLY A 20 5 3 HELIX 3 3 LEU A 23 SER A 34 1 12 HELIX 4 4 CYS A 77 PHE A 80 5 4 HELIX 5 5 THR A 86 ILE A 98 1 13 HELIX 6 6 ILE A 101 TYR A 103 5 3 HELIX 7 7 LEU A 105 LEU A 110 1 6 HELIX 8 8 LEU A 115 TRP A 118 5 4 SHEET 1 A 2 ILE A 41 GLU A 43 0 SHEET 2 A 2 THR A 48 TYR A 50 -1 N GLU A 49 O VAL A 42 SSBOND 1 CYS A 6 CYS A 120 1555 1555 2.03 SSBOND 2 CYS A 28 CYS A 111 1555 1555 2.01 SSBOND 3 CYS A 61 CYS A 77 1555 1555 2.05 SSBOND 4 CYS A 73 CYS A 91 1555 1555 2.01 LINK OG1 THR A 38 CA CA A 125 1555 1555 2.67 LINK OE1 GLN A 39 CA CA A 125 1555 1555 3.06 LINK O LYS A 79 CA CA A 124 1555 1555 2.28 LINK O LEU A 81 CA CA A 125 1555 1555 2.76 LINK OD1 ASP A 82 CA CA A 124 1555 1555 2.46 LINK OD1 ASP A 83 CA CA A 125 1555 1555 2.84 LINK O ASP A 84 CA CA A 124 1555 1555 2.20 LINK OD1 ASP A 87 CA CA A 124 1555 1555 2.49 LINK OD1 ASP A 88 CA CA A 124 1555 1555 2.52 LINK CA CA A 124 O HOH A 134 1555 1555 2.55 LINK CA CA A 124 O HOH A 150 1555 1555 2.50 SITE 1 CB1 5 LYS A 79 ASP A 82 ASP A 84 ASP A 87 SITE 2 CB1 5 ASP A 88 SITE 1 CB2 4 THR A 38 GLN A 39 LEU A 81 ASP A 83 SITE 1 AC1 7 LYS A 79 ASP A 82 ASP A 84 ASP A 87 SITE 2 AC1 7 ASP A 88 HOH A 134 HOH A 150 SITE 1 AC2 5 THR A 38 GLN A 39 LEU A 81 ASP A 82 SITE 2 AC2 5 ASP A 83 CRYST1 35.470 69.560 45.960 90.00 90.00 90.00 P 21 21 2 4 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 0.028193 0.000000 0.000000 0.00000 SCALE2 0.000000 0.014376 0.000000 0.00000 SCALE3 0.000000 0.000000 0.021758 0.00000