HEADER SIGNALING PROTEIN 24-SEP-99 1D2L TITLE NMR SOLUTION STRUCTURE OF COMPLEMENT-LIKE REPEAT CR3 FROM THE LOW TITLE 2 DENSITY LIPOPROTEIN RECEPTOR-RELATED PROTEIN (LRP). EVIDENCE FOR TITLE 3 SPECIFIC BINDING TO THE RECEPTOR BINDING DOMAIN OF HUMAN ALPHA-2 TITLE 4 MACROGLOBULIN COMPND MOL_ID: 1; COMPND 2 MOLECULE: LIPOPROTEIN RECEPTOR RELATED PROTEIN; COMPND 3 CHAIN: A; COMPND 4 FRAGMENT: COMPLEMENT-LIKE REPEAT 3 (CR3); COMPND 5 ENGINEERED: YES SOURCE MOL_ID: 1; SOURCE 2 ORGANISM_SCIENTIFIC: HOMO SAPIENS; SOURCE 3 ORGANISM_COMMON: HUMAN; SOURCE 4 ORGANISM_TAXID: 9606; SOURCE 5 TISSUE: LIVER; SOURCE 6 EXPRESSION_SYSTEM: ESCHERICHIA COLI; SOURCE 7 EXPRESSION_SYSTEM_TAXID: 562; SOURCE 8 EXPRESSION_SYSTEM_VECTOR_TYPE: PLASMID; SOURCE 9 EXPRESSION_SYSTEM_PLASMID: PGEX-2T KEYWDS LIGAND BINDING, CALCIUM BINDING, COMPLEMENT-LIKE REPEAT, RECEPTOR, KEYWDS 2 SIGNALING PROTEIN EXPDTA SOLUTION NMR NUMMDL 20 AUTHOR K.DOLMER,W.HUANG,P.G.W.GETTINS REVDAT 6 21-DEC-22 1D2L 1 SEQADV REVDAT 5 16-FEB-22 1D2L 1 REMARK LINK REVDAT 4 24-FEB-09 1D2L 1 VERSN REVDAT 3 01-APR-03 1D2L 1 JRNL REVDAT 2 21-FEB-00 1D2L 1 JRNL REVDAT 1 14-JAN-00 1D2L 0 JRNL AUTH K.DOLMER,W.HUANG,P.G.GETTINS JRNL TITL NMR SOLUTION STRUCTURE OF COMPLEMENT-LIKE REPEAT CR3 FROM JRNL TITL 2 THE LOW DENSITY LIPOPROTEIN RECEPTOR-RELATED PROTEIN. JRNL TITL 3 EVIDENCE FOR SPECIFIC BINDING TO THE RECEPTOR BINDING DOMAIN JRNL TITL 4 OF HUMAN ALPHA(2)-MACROGLOBULIN. JRNL REF J.BIOL.CHEM. V. 275 3264 2000 JRNL REFN ISSN 0021-9258 JRNL PMID 10652313 JRNL DOI 10.1074/JBC.275.5.3264 REMARK 2 REMARK 2 RESOLUTION. NOT APPLICABLE. REMARK 3 REMARK 3 REFINEMENT. REMARK 3 PROGRAM : SYBYL 6.3, AMBER 5.0 REMARK 3 AUTHORS : TRIPOS INC. (SYBYL), CASE, D. A., ET AL. (1997) REMARK 3 AMBER 5, UNIV. OF CALIFORNIA, SAN FRANCISCO, REMARK 3 UNPUBLISHED (AMBER) REMARK 3 REMARK 3 OTHER REFINEMENT REMARKS: THE STRUCTURES ARE BASED ON 602 NOE REMARK 3 CONSTRAINTS, 9 DISTANCE CONSTRAINTS FOR THE CALCIUM BINDING SITE, REMARK 3 3 DISULFIDE BRIDGES, 10 HYDROGEN BONDS AND FIVE DIHEDRAL ANGLE REMARK 3 CONSTRAINTS. REMARK 4 REMARK 4 1D2L COMPLIES WITH FORMAT V. 3.15, 01-DEC-08 REMARK 100 REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY RCSB ON 28-SEP-99. REMARK 100 THE DEPOSITION ID IS D_1000009736. REMARK 210 REMARK 210 EXPERIMENTAL DETAILS REMARK 210 EXPERIMENT TYPE : NMR REMARK 210 TEMPERATURE (KELVIN) : 298 REMARK 210 PH : 5.5 REMARK 210 IONIC STRENGTH : 20 MM NA-D3-ACETATE, 10 MM CACL2 REMARK 210 PRESSURE : AMBIENT REMARK 210 SAMPLE CONTENTS : 2 MM CR3 U-15N,13C 20 MM NA-D3 REMARK 210 -ACETATE PH 5.5 10 MM CACL 90% REMARK 210 H2O, 10% D2O REMARK 210 REMARK 210 NMR EXPERIMENTS CONDUCTED : 3D_15N-SEPARATED TOCSY; 3D_13C REMARK 210 -SEPARATED TOCSY; 3D_15N- REMARK 210 SEPARATED_NOESY; 3D_13C- REMARK 210 SEPARATED_NOESY; HBHA(CO)NH; REMARK 210 CBCA(CO)NH REMARK 210 SPECTROMETER FIELD STRENGTH : 600 MHZ REMARK 210 SPECTROMETER MODEL : DRX REMARK 210 SPECTROMETER MANUFACTURER : BRUKER REMARK 210 REMARK 210 STRUCTURE DETERMINATION. REMARK 210 SOFTWARE USED : DYANA 1.5, PROFIT 1.8 REMARK 210 METHOD USED : MOLECULAR DYNAMICS ENERGY REMARK 210 MINIMIZATION REMARK 210 REMARK 210 CONFORMERS, NUMBER CALCULATED : 40 REMARK 210 CONFORMERS, NUMBER SUBMITTED : 20 REMARK 210 CONFORMERS, SELECTION CRITERIA : STRUCTURES WITH THE LEAST REMARK 210 RESTRAINT VIOLATIONS,STRUCTURES REMARK 210 WITH THE LOWEST ENERGY REMARK 210 REMARK 210 BEST REPRESENTATIVE CONFORMER IN THIS ENSEMBLE : 1 REMARK 210 REMARK 210 REMARK: THE STRUCTURE WAS DETERMINED USING TRIPLE-RESONANCE NMR REMARK 210 SPECTROSCOPY. 20 STRUCTURES IN THE DEPOSITION WERE FITTED BY REMARK 210 FITTING STRUCTURES 2-20 TO THE FIRST, USING PROFIT V1.8 REMARK 210 (MCLACHLAN, A. D., 1982 ACTA. CRYST.A38, 871-3) AS IMPLEMENTED REMARK 210 IN THE PROGRAM PROFIT (MARTIN, A. C. R.,HTTP:// REMARK 210 WWW.BIOCHEM.UCL.AC.UK/~MARTIN/PROGRAMS/#PROFIT) REMARK 215 REMARK 215 NMR STUDY REMARK 215 THE COORDINATES IN THIS ENTRY WERE GENERATED FROM SOLUTION REMARK 215 NMR DATA. PROTEIN DATA BANK CONVENTIONS REQUIRE THAT REMARK 215 CRYST1 AND SCALE RECORDS BE INCLUDED, BUT THE VALUES ON REMARK 215 THESE RECORDS ARE MEANINGLESS. 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 ARE IN CLOSE CONTACT. REMARK 500 REMARK 500 ATM1 RES C SSEQI ATM2 RES C SSEQI DISTANCE REMARK 500 OD1 ASP A 33 HG SER A 35 1.31 REMARK 500 O TRP A 23 OD2 ASP A 36 1.85 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 1 CYS A 18 CA - CB - SG ANGL. DEV. = 8.8 DEGREES REMARK 500 1 CYS A 25 CA - CB - SG ANGL. DEV. = 7.3 DEGREES REMARK 500 1 ASP A 30 CA - CB - CG ANGL. DEV. = 13.7 DEGREES REMARK 500 1 CYS A 31 CA - CB - SG ANGL. DEV. = 8.2 DEGREES REMARK 500 1 ASP A 36 CB - CG - OD2 ANGL. DEV. = -5.8 DEGREES REMARK 500 2 CYS A 18 CA - CB - SG ANGL. DEV. = 6.7 DEGREES REMARK 500 4 CYS A 18 CA - CB - SG ANGL. DEV. = 7.2 DEGREES REMARK 500 4 ARG A 22 NE - CZ - NH1 ANGL. DEV. = 3.2 DEGREES REMARK 500 5 CYS A 18 CA - CB - SG ANGL. DEV. = 8.0 DEGREES REMARK 500 5 ARG A 22 NE - CZ - NH1 ANGL. DEV. = 3.2 DEGREES REMARK 500 5 CYS A 25 CA - CB - SG ANGL. DEV. = 7.9 DEGREES REMARK 500 6 CYS A 18 CA - CB - SG ANGL. DEV. = 6.8 DEGREES REMARK 500 6 ARG A 22 NE - CZ - NH1 ANGL. DEV. = 3.2 DEGREES REMARK 500 7 ARG A 22 NE - CZ - NH1 ANGL. DEV. = 3.2 DEGREES REMARK 500 8 CYS A 18 CA - CB - SG ANGL. DEV. = 8.2 DEGREES REMARK 500 8 ARG A 22 NE - CZ - NH1 ANGL. DEV. = 3.3 DEGREES REMARK 500 8 ASP A 36 CB - CG - OD2 ANGL. DEV. = -7.3 DEGREES REMARK 500 9 CYS A 18 CA - CB - SG ANGL. DEV. = 7.0 DEGREES REMARK 500 9 ARG A 22 NE - CZ - NH1 ANGL. DEV. = 3.6 DEGREES REMARK 500 9 CYS A 25 CA - CB - SG ANGL. DEV. = 7.0 DEGREES REMARK 500 10 ARG A 17 NE - CZ - NH1 ANGL. DEV. = 3.1 DEGREES REMARK 500 11 ARG A 17 NE - CZ - NH1 ANGL. DEV. = 3.0 DEGREES REMARK 500 11 CYS A 18 CA - CB - SG ANGL. DEV. = 7.4 DEGREES REMARK 500 11 ARG A 22 NE - CZ - NH1 ANGL. DEV. = 3.2 DEGREES REMARK 500 11 CYS A 25 CA - CB - SG ANGL. DEV. = 7.7 DEGREES REMARK 500 12 ARG A 17 NE - CZ - NH1 ANGL. DEV. = 3.2 DEGREES REMARK 500 12 CYS A 18 CA - CB - SG ANGL. DEV. = 8.5 DEGREES REMARK 500 13 ARG A 17 NE - CZ - NH1 ANGL. DEV. = 3.1 DEGREES REMARK 500 13 CYS A 18 CA - CB - SG ANGL. DEV. = 7.0 DEGREES REMARK 500 13 ARG A 22 NE - CZ - NH1 ANGL. DEV. = 3.2 DEGREES REMARK 500 13 ASP A 30 C - N - CA ANGL. DEV. = 17.0 DEGREES REMARK 500 13 ASP A 36 CB - CG - OD2 ANGL. DEV. = -7.2 DEGREES REMARK 500 14 ARG A 17 NE - CZ - NH1 ANGL. DEV. = 3.1 DEGREES REMARK 500 15 ARG A 22 NE - CZ - NH1 ANGL. DEV. = 3.2 DEGREES REMARK 500 15 ASP A 30 C - N - CA ANGL. DEV. = 17.4 DEGREES REMARK 500 16 ARG A 17 NE - CZ - NH1 ANGL. DEV. = 3.1 DEGREES REMARK 500 16 ARG A 22 NE - CZ - NH1 ANGL. DEV. = 3.6 DEGREES REMARK 500 16 CYS A 25 CA - CB - SG ANGL. DEV. = 6.8 DEGREES REMARK 500 16 ASP A 30 C - N - CA ANGL. DEV. = 17.1 DEGREES REMARK 500 16 ASP A 36 CB - CG - OD2 ANGL. DEV. = -5.8 DEGREES REMARK 500 17 ARG A 17 NE - CZ - NH1 ANGL. DEV. = 3.2 DEGREES REMARK 500 17 CYS A 18 CA - CB - SG ANGL. DEV. = 6.8 DEGREES REMARK 500 17 ARG A 22 NE - CZ - NH1 ANGL. DEV. = 3.2 DEGREES REMARK 500 17 ASP A 30 C - N - CA ANGL. DEV. = 17.9 DEGREES REMARK 500 18 ARG A 22 NE - CZ - NH1 ANGL. DEV. = 3.2 DEGREES REMARK 500 18 CYS A 31 CA - CB - SG ANGL. DEV. = 6.9 DEGREES REMARK 500 19 ARG A 17 NE - CZ - NH1 ANGL. DEV. = 3.1 DEGREES REMARK 500 19 CYS A 18 CA - CB - SG ANGL. DEV. = 7.3 DEGREES REMARK 500 19 ARG A 22 NE - CZ - NH1 ANGL. DEV. = 4.6 DEGREES REMARK 500 19 ASP A 30 C - N - CA ANGL. DEV. = 17.4 DEGREES REMARK 500 REMARK 500 THIS ENTRY HAS 56 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 1 GLN A 5 -11.48 81.48 REMARK 500 1 CYS A 6 -50.05 -162.94 REMARK 500 1 GLU A 10 -158.90 -133.29 REMARK 500 1 SER A 16 45.42 126.55 REMARK 500 1 ASP A 30 -60.89 59.61 REMARK 500 1 LEU A 32 -34.03 71.15 REMARK 500 1 PRO A 39 20.99 -69.89 REMARK 500 1 LEU A 41 -74.39 -120.61 REMARK 500 1 CYS A 42 -70.12 -139.92 REMARK 500 1 HIS A 43 86.19 63.87 REMARK 500 2 SER A 2 -36.27 105.66 REMARK 500 2 CYS A 6 -55.50 -120.93 REMARK 500 2 SER A 16 50.75 126.28 REMARK 500 2 LEU A 32 -36.55 62.37 REMARK 500 2 ASN A 34 74.56 59.70 REMARK 500 2 ASP A 36 -67.65 -28.60 REMARK 500 2 PRO A 39 21.66 -68.31 REMARK 500 2 LEU A 41 -80.50 -120.15 REMARK 500 2 CYS A 42 -54.36 -141.74 REMARK 500 2 HIS A 43 99.25 57.15 REMARK 500 3 SER A 2 -58.47 110.55 REMARK 500 3 SER A 16 53.78 128.03 REMARK 500 3 ASN A 29 -13.81 -29.29 REMARK 500 3 LEU A 32 -29.77 69.66 REMARK 500 3 PRO A 39 20.72 -69.12 REMARK 500 3 LEU A 41 -76.07 -123.66 REMARK 500 3 CYS A 42 -67.12 -139.74 REMARK 500 3 HIS A 43 -59.41 56.95 REMARK 500 3 GLN A 44 -65.59 59.45 REMARK 500 4 SER A 2 -56.17 -167.27 REMARK 500 4 SER A 16 48.49 128.36 REMARK 500 4 ASN A 29 52.83 -65.23 REMARK 500 4 LEU A 32 -34.51 63.60 REMARK 500 4 ASN A 34 86.41 56.97 REMARK 500 4 SER A 35 -61.77 -105.05 REMARK 500 4 ASP A 36 -67.46 -29.97 REMARK 500 4 PRO A 39 20.69 -68.09 REMARK 500 4 LEU A 41 -76.62 -125.76 REMARK 500 4 CYS A 42 -71.23 -138.53 REMARK 500 4 HIS A 43 96.07 58.19 REMARK 500 4 GLN A 44 68.57 -153.58 REMARK 500 5 GLN A 5 -27.38 85.41 REMARK 500 5 CYS A 6 -52.52 -152.93 REMARK 500 5 SER A 16 53.45 106.91 REMARK 500 5 ASN A 29 56.93 -67.77 REMARK 500 5 LEU A 32 -35.75 64.16 REMARK 500 5 ASN A 34 80.75 54.58 REMARK 500 5 SER A 35 -76.45 -86.12 REMARK 500 5 ASP A 36 -70.68 -22.49 REMARK 500 5 LEU A 41 -77.09 -125.57 REMARK 500 REMARK 500 THIS ENTRY HAS 234 RAMACHANDRAN OUTLIERS. REMARK 500 REMARK 500 REMARK: NULL REMARK 500 REMARK 500 GEOMETRY AND STEREOCHEMISTRY REMARK 500 SUBTOPIC: NON-CIS, NON-TRANS REMARK 500 REMARK 500 THE FOLLOWING PEPTIDE BONDS DEVIATE SIGNIFICANTLY FROM BOTH REMARK 500 CIS AND TRANS CONFORMATION. CIS BONDS, IF ANY, ARE LISTED REMARK 500 ON CISPEP RECORDS. TRANS IS DEFINED AS 180 +/- 30 AND REMARK 500 CIS IS DEFINED AS 0 +/- 30 DEGREES. REMARK 500 MODEL OMEGA REMARK 500 CYS A 25 ASP A 26 2 145.55 REMARK 500 CYS A 25 ASP A 26 3 137.42 REMARK 500 ASN A 29 ASP A 30 3 -85.44 REMARK 500 CYS A 25 ASP A 26 4 133.09 REMARK 500 CYS A 25 ASP A 26 7 145.45 REMARK 500 ASN A 29 ASP A 30 7 -91.61 REMARK 500 ASN A 29 ASP A 30 8 146.95 REMARK 500 CYS A 25 ASP A 26 14 145.12 REMARK 500 ASN A 29 ASP A 30 14 -120.75 REMARK 500 CYS A 25 ASP A 26 15 140.46 REMARK 500 CYS A 25 ASP A 26 17 143.32 REMARK 500 GLU A 37 ALA A 38 17 148.31 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 5 ARG A 22 0.15 SIDE CHAIN REMARK 500 9 ARG A 22 0.09 SIDE CHAIN REMARK 500 16 ARG A 22 0.12 SIDE CHAIN REMARK 500 19 ARG A 22 0.10 SIDE CHAIN REMARK 500 20 ARG A 22 0.11 SIDE CHAIN 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 46 CA REMARK 620 N RES CSSEQI ATOM REMARK 620 1 TRP A 23 O REMARK 620 2 ASP A 26 OD1 113.5 REMARK 620 3 ASP A 28 O 154.5 92.0 REMARK 620 4 ASP A 30 OD2 93.4 59.0 101.0 REMARK 620 5 ASP A 36 OD2 45.7 158.0 108.9 120.8 REMARK 620 6 GLU A 37 OE2 66.2 110.9 104.9 152.7 58.0 REMARK 620 N 1 2 3 4 5 REMARK 800 REMARK 800 SITE REMARK 800 SITE_IDENTIFIER: AC1 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE CA A 46 REMARK 900 REMARK 900 RELATED ENTRIES REMARK 900 RELATED ID: 1CR8 RELATED DB: PDB REMARK 900 CR3 AND CR8 ARE FROM THE SAME CLUSTER OF COMPLEMENT-LIKE REPEATS REMARK 900 FROM LRP DBREF 1D2L A 3 45 UNP Q07954 LRP1_HUMAN 851 893 SEQADV 1D2L GLY A 1 UNP Q07954 CLONING ARTIFACT SEQADV 1D2L SER A 2 UNP Q07954 CLONING ARTIFACT SEQRES 1 A 45 GLY SER PRO PRO GLN CYS GLN PRO GLY GLU PHE ALA CYS SEQRES 2 A 45 ALA ASN SER ARG CYS ILE GLN GLU ARG TRP LYS CYS ASP SEQRES 3 A 45 GLY ASP ASN ASP CYS LEU ASP ASN SER ASP GLU ALA PRO SEQRES 4 A 45 ALA LEU CYS HIS GLN HIS HET CA A 46 1 HETNAM CA CALCIUM ION FORMUL 2 CA CA 2+ HELIX 1 1 GLN A 20 LYS A 24 5 5 SHEET 1 A 2 PHE A 11 CYS A 13 0 SHEET 2 A 2 ARG A 17 ILE A 19 -1 N ARG A 17 O CYS A 13 SSBOND 1 CYS A 6 CYS A 18 1555 1555 2.05 SSBOND 2 CYS A 13 CYS A 31 1555 1555 2.02 SSBOND 3 CYS A 25 CYS A 42 1555 1555 2.02 LINK O TRP A 23 CA CA A 46 1555 1555 2.41 LINK OD1 ASP A 26 CA CA A 46 1555 1555 2.37 LINK O ASP A 28 CA CA A 46 1555 1555 2.44 LINK OD2 ASP A 30 CA CA A 46 1555 1555 2.41 LINK OD2 ASP A 36 CA CA A 46 1555 1555 2.36 LINK OE2 GLU A 37 CA CA A 46 1555 1555 2.38 SITE 1 AC1 7 TRP A 23 ASP A 26 GLY A 27 ASP A 28 SITE 2 AC1 7 ASP A 30 ASP A 36 GLU A 37 CRYST1 1.000 1.000 1.000 90.00 90.00 90.00 P 1 1 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 1.000000 0.000000 0.000000 0.00000 SCALE2 0.000000 1.000000 0.000000 0.00000 SCALE3 0.000000 0.000000 1.000000 0.00000 MODEL 1