2R16 - Header Asymmetric Unit

HEADER CELL ADHESION, SPLICING 22-AUG-07 2R16

TITLE CRYSTAL STRUCTURE OF BOVINE NEUREXIN 1 ALPHA LNS/LG DOMAIN TITLE 2 4 (WITH NO SPLICE INSERT)

COMPND MOL_ID: 1; COMPND 2 MOLECULE: NEUREXIN-1-ALPHA; COMPND 3 CHAIN: A; COMPND 4 SYNONYM: NEUREXIN I-ALPHA; COMPND 5 ENGINEERED: YES

SOURCE MOL_ID: 1; SOURCE 2 ORGANISM_SCIENTIFIC: BOS TAURUS; SOURCE 3 ORGANISM_COMMON: CATTLE; SOURCE 4 ORGANISM_TAXID: 9913; SOURCE 5 GENE: NRXN1; SOURCE 6 EXPRESSION_SYSTEM: ESCHERICHIA COLI; SOURCE 7 EXPRESSION_SYSTEM_TAXID: 562; SOURCE 8 EXPRESSION_SYSTEM_STRAIN: ORIGAMI B; SOURCE 9 EXPRESSION_SYSTEM_VECTOR_TYPE: GST-FUSION; SOURCE 10 EXPRESSION_SYSTEM_PLASMID: PGEX-KG

KEYWDS BETA-SANDWICH, CELL ADHESION, SPLICING

EXPDTA X-RAY DIFFRACTION

AUTHOR G.RUDENKO

REVDAT 2 24-FEB-09 2R16 1 VERSN REVDAT 1 25-MAR-08 2R16 0

JRNL AUTH K.C.SHEN,D.A.KUCZYNSKA,I.J.WU,B.H.MURRAY, JRNL AUTH 2 L.R.SHECKLER,G.RUDENKO JRNL TITL REGULATION OF NEUREXIN 1BETA TERTIARY STRUCTURE JRNL TITL 2 AND LIGAND BINDING THROUGH ALTERNATIVE SPLICING JRNL REF STRUCTURE V. 16 422 2008 JRNL REFN ISSN 0969-2126 JRNL PMID 18334217 JRNL DOI 10.1016/J.STR.2008.01.005

REMARK 1

REMARK 2 REMARK 2 RESOLUTION. 1.04 ANGSTROMS.

REMARK 3 REMARK 3 REFINEMENT. REMARK 3 PROGRAM : REFMAC 5.3 REMARK 3 AUTHORS : MURSHUDOV,VAGIN,DODSON REMARK 3 REMARK 3 REFINEMENT TARGET : MAXIMUM LIKELIHOOD REMARK 3 REMARK 3 DATA USED IN REFINEMENT. REMARK 3 RESOLUTION RANGE HIGH (ANGSTROMS) : 1.04 REMARK 3 RESOLUTION RANGE LOW (ANGSTROMS) : 23.70 REMARK 3 DATA CUTOFF (SIGMA(F)) : 0.000 REMARK 3 COMPLETENESS FOR RANGE (%) : 100.0 REMARK 3 NUMBER OF REFLECTIONS : 72763 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 + TEST SET) : 0.148 REMARK 3 R VALUE (WORKING SET) : 0.146 REMARK 3 FREE R VALUE : 0.165 REMARK 3 FREE R VALUE TEST SET SIZE (%) : 10.000 REMARK 3 FREE R VALUE TEST SET COUNT : 8108 REMARK 3 REMARK 3 FIT IN THE HIGHEST RESOLUTION BIN. REMARK 3 TOTAL NUMBER OF BINS USED : 20 REMARK 3 BIN RESOLUTION RANGE HIGH (A) : 1.04 REMARK 3 BIN RESOLUTION RANGE LOW (A) : 1.07 REMARK 3 REFLECTION IN BIN (WORKING SET) : 3377 REMARK 3 BIN COMPLETENESS (WORKING+TEST) (%) : 100.00 REMARK 3 BIN R VALUE (WORKING SET) : 0.1600 REMARK 3 BIN FREE R VALUE SET COUNT : 338 REMARK 3 BIN FREE R VALUE : 0.1820 REMARK 3 REMARK 3 NUMBER OF NON-HYDROGEN ATOMS USED IN REFINEMENT. REMARK 3 PROTEIN ATOMS : 1476 REMARK 3 NUCLEIC ACID ATOMS : 0 REMARK 3 HETEROGEN ATOMS : 1 REMARK 3 SOLVENT ATOMS : 130 REMARK 3 REMARK 3 B VALUES. REMARK 3 FROM WILSON PLOT (A**2) : 7.50 REMARK 3 MEAN B VALUE (OVERALL, A**2) : 11.29 REMARK 3 OVERALL ANISOTROPIC B VALUE. REMARK 3 B11 (A**2) : -0.08000 REMARK 3 B22 (A**2) : -0.08000 REMARK 3 B33 (A**2) : 0.13000 REMARK 3 B12 (A**2) : -0.04000 REMARK 3 B13 (A**2) : 0.00000 REMARK 3 B23 (A**2) : 0.00000 REMARK 3 REMARK 3 ESTIMATED OVERALL COORDINATE ERROR. REMARK 3 ESU BASED ON R VALUE (A): 0.026 REMARK 3 ESU BASED ON FREE R VALUE (A): 0.026 REMARK 3 ESU BASED ON MAXIMUM LIKELIHOOD (A): 0.013 REMARK 3 ESU FOR B VALUES BASED ON MAXIMUM LIKELIHOOD (A**2): 0.546 REMARK 3 REMARK 3 CORRELATION COEFFICIENTS. REMARK 3 CORRELATION COEFFICIENT FO-FC : 0.971 REMARK 3 CORRELATION COEFFICIENT FO-FC FREE : 0.966 REMARK 3 REMARK 3 RMS DEVIATIONS FROM IDEAL VALUES COUNT RMS WEIGHT REMARK 3 BOND LENGTHS REFINED ATOMS (A): 1509 ; 0.016 ; 0.021 REMARK 3 BOND LENGTHS OTHERS (A): 1022 ; 0.002 ; 0.020 REMARK 3 BOND ANGLES REFINED ATOMS (DEGREES): 2051 ; 1.906 ; 1.953 REMARK 3 BOND ANGLES OTHERS (DEGREES): 2496 ; 1.930 ; 3.003 REMARK 3 TORSION ANGLES, PERIOD 1 (DEGREES): 191 ; 7.896 ; 5.000 REMARK 3 TORSION ANGLES, PERIOD 2 (DEGREES): 70 ;31.140 ;23.429 REMARK 3 TORSION ANGLES, PERIOD 3 (DEGREES): 279 ;12.328 ;15.000 REMARK 3 TORSION ANGLES, PERIOD 4 (DEGREES): 13 ;10.121 ;15.000 REMARK 3 CHIRAL-CENTER RESTRAINTS (A**3): 236 ; 0.115 ; 0.200 REMARK 3 GENERAL PLANES REFINED ATOMS (A): 1696 ; 0.008 ; 0.020 REMARK 3 GENERAL PLANES OTHERS (A): 316 ; 0.002 ; 0.020 REMARK 3 NON-BONDED CONTACTS REFINED ATOMS (A): 250 ; 0.226 ; 0.200 REMARK 3 NON-BONDED CONTACTS OTHERS (A): 1110 ; 0.217 ; 0.200 REMARK 3 NON-BONDED TORSION REFINED ATOMS (A): 726 ; 0.175 ; 0.200 REMARK 3 NON-BONDED TORSION OTHERS (A): 897 ; 0.094 ; 0.200 REMARK 3 H-BOND (X...Y) REFINED ATOMS (A): 84 ; 0.136 ; 0.200 REMARK 3 H-BOND (X...Y) OTHERS (A): NULL ; NULL ; NULL REMARK 3 POTENTIAL METAL-ION REFINED ATOMS (A): 1 ; 0.060 ; 0.200 REMARK 3 POTENTIAL METAL-ION OTHERS (A): NULL ; NULL ; NULL REMARK 3 SYMMETRY VDW REFINED ATOMS (A): 9 ; 0.215 ; 0.200 REMARK 3 SYMMETRY VDW OTHERS (A): 40 ; 0.332 ; 0.200 REMARK 3 SYMMETRY H-BOND REFINED ATOMS (A): 23 ; 0.425 ; 0.200 REMARK 3 SYMMETRY H-BOND OTHERS (A): NULL ; NULL ; NULL REMARK 3 SYMMETRY METAL-ION REFINED ATOMS (A): NULL ; NULL ; NULL REMARK 3 SYMMETRY METAL-ION OTHERS (A): NULL ; NULL ; NULL REMARK 3 REMARK 3 ISOTROPIC THERMAL FACTOR RESTRAINTS. COUNT RMS WEIGHT REMARK 3 MAIN-CHAIN BOND REFINED ATOMS (A**2): 954 ; 1.659 ; 1.500 REMARK 3 MAIN-CHAIN BOND OTHER ATOMS (A**2): 384 ; 0.680 ; 1.500 REMARK 3 MAIN-CHAIN ANGLE REFINED ATOMS (A**2): 1508 ; 2.350 ; 2.000 REMARK 3 SIDE-CHAIN BOND REFINED ATOMS (A**2): 622 ; 2.964 ; 3.000 REMARK 3 SIDE-CHAIN ANGLE REFINED ATOMS (A**2): 542 ; 3.966 ; 4.500 REMARK 3 REMARK 3 ANISOTROPIC THERMAL FACTOR RESTRAINTS. COUNT RMS WEIGHT REMARK 3 RIGID-BOND RESTRAINTS (A**2): 2775 ; 1.389 ; 3.000 REMARK 3 SPHERICITY; FREE ATOMS (A**2): 134 ; 8.859 ; 3.000 REMARK 3 SPHERICITY; BONDED ATOMS (A**2): 2499 ; 3.947 ; 3.000 REMARK 3 REMARK 3 NCS RESTRAINTS STATISTICS REMARK 3 NUMBER OF DIFFERENT NCS GROUPS : NULL REMARK 3 REMARK 3 TLS DETAILS REMARK 3 NUMBER OF TLS GROUPS : 1 REMARK 3 REMARK 3 TLS GROUP : 1 REMARK 3 NUMBER OF COMPONENTS GROUP : 1 REMARK 3 COMPONENTS C SSSEQI TO C SSSEQI REMARK 3 RESIDUE RANGE : A 723 A 906 REMARK 3 ORIGIN FOR THE GROUP (A): 20.7429 53.3942 12.2062 REMARK 3 T TENSOR REMARK 3 T11: -0.0829 T22: -0.0849 REMARK 3 T33: -0.0794 T12: 0.0128 REMARK 3 T13: 0.0075 T23: 0.0005 REMARK 3 L TENSOR REMARK 3 L11: 0.8711 L22: 1.5195 REMARK 3 L33: 1.4857 L12: -0.2398 REMARK 3 L13: -0.5572 L23: 0.0011 REMARK 3 S TENSOR REMARK 3 S11: 0.0475 S12: 0.0070 S13: 0.0571 REMARK 3 S21: 0.0378 S22: -0.0095 S23: 0.0263 REMARK 3 S31: -0.0391 S32: -0.0262 S33: -0.0380 REMARK 3 REMARK 3 BULK SOLVENT MODELLING. REMARK 3 METHOD USED : BABINET MODEL WITH MASK REMARK 3 PARAMETERS FOR MASK CALCULATION REMARK 3 VDW PROBE RADIUS : 1.20 REMARK 3 ION PROBE RADIUS : 0.80 REMARK 3 SHRINKAGE RADIUS : 0.80 REMARK 3 REMARK 3 OTHER REFINEMENT REMARKS: HYDROGENS HAVE BEEN ADDED IN THE REMARK 3 RIDING POSITIONS

REMARK 4 REMARK 4 2R16 COMPLIES WITH FORMAT V. 3.15, 01-DEC-08

REMARK 100 REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY RCSB ON 13-SEP-07. REMARK 100 THE RCSB ID CODE IS RCSB044297.

REMARK 200 REMARK 200 EXPERIMENTAL DETAILS REMARK 200 EXPERIMENT TYPE : X-RAY DIFFRACTION REMARK 200 DATE OF DATA COLLECTION : 16-AUG-06 REMARK 200 TEMPERATURE (KELVIN) : 103 REMARK 200 PH : 9.0 REMARK 200 NUMBER OF CRYSTALS USED : 1 REMARK 200 REMARK 200 SYNCHROTRON (Y/N) : Y REMARK 200 RADIATION SOURCE : APS REMARK 200 BEAMLINE : 23-ID-B REMARK 200 X-RAY GENERATOR MODEL : NULL REMARK 200 MONOCHROMATIC OR LAUE (M/L) : M REMARK 200 WAVELENGTH OR RANGE (A) : 0.96112 REMARK 200 MONOCHROMATOR : SEE BEAM-LINE SPECIFICATIONS REMARK 200 OPTICS : NULL REMARK 200 REMARK 200 DETECTOR TYPE : CCD REMARK 200 DETECTOR MANUFACTURER : MARMOSAIC 300 MM CCD REMARK 200 INTENSITY-INTEGRATION SOFTWARE : HKL-2000 REMARK 200 DATA SCALING SOFTWARE : HKL-2000 REMARK 200 REMARK 200 NUMBER OF UNIQUE REFLECTIONS : 82197 REMARK 200 RESOLUTION RANGE HIGH (A) : 1.040 REMARK 200 RESOLUTION RANGE LOW (A) : 23.700 REMARK 200 REJECTION CRITERIA (SIGMA(I)) : 0.000 REMARK 200 REMARK 200 OVERALL. REMARK 200 COMPLETENESS FOR RANGE (%) : 92.9 REMARK 200 DATA REDUNDANCY : 12.600 REMARK 200 R MERGE (I) : 0.07000 REMARK 200 R SYM (I) : NULL REMARK 200 <I/SIGMA(I)> FOR THE DATA SET : 37.9000 REMARK 200 REMARK 200 IN THE HIGHEST RESOLUTION SHELL. REMARK 200 HIGHEST RESOLUTION SHELL, RANGE HIGH (A) : 1.04 REMARK 200 HIGHEST RESOLUTION SHELL, RANGE LOW (A) : 1.08 REMARK 200 COMPLETENESS FOR SHELL (%) : 60.5 REMARK 200 DATA REDUNDANCY IN SHELL : 7.60 REMARK 200 R MERGE FOR SHELL (I) : 0.29600 REMARK 200 R SYM FOR SHELL (I) : 0.29600 REMARK 200 <I/SIGMA(I)> FOR SHELL : 6.200 REMARK 200 REMARK 200 DIFFRACTION PROTOCOL: SINGLE WAVELENGTH REMARK 200 METHOD USED TO DETERMINE THE STRUCTURE: MOLECULAR REPLACEMENT REMARK 200 SOFTWARE USED: CNS REMARK 200 STARTING MODEL: PDB ENTRY 1C4R REMARK 200 REMARK 200 REMARK: NULL

REMARK 280 REMARK 280 CRYSTAL REMARK 280 SOLVENT CONTENT, VS (%): 45.85 REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 2.27 REMARK 280 REMARK 280 CRYSTALLIZATION CONDITIONS: 12.5% ISOPROPANOL, 0.1 M CHES PH REMARK 280 9.0, 5 MM CACL2, , VAPOR DIFFUSION, HANGING DROP, TEMPERATURE REMARK 280 293K

REMARK 290 REMARK 290 CRYSTALLOGRAPHIC SYMMETRY REMARK 290 SYMMETRY OPERATORS FOR SPACE GROUP: P 63 REMARK 290 REMARK 290 SYMOP SYMMETRY REMARK 290 NNNMMM OPERATOR REMARK 290 1555 X,Y,Z REMARK 290 2555 -Y,X-Y,Z REMARK 290 3555 -X+Y,-X,Z REMARK 290 4555 -X,-Y,Z+1/2 REMARK 290 5555 Y,-X+Y,Z+1/2 REMARK 290 6555 X-Y,X,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 -0.500000 -0.866025 0.000000 0.00000 REMARK 290 SMTRY2 2 0.866025 -0.500000 0.000000 0.00000 REMARK 290 SMTRY3 2 0.000000 0.000000 1.000000 0.00000 REMARK 290 SMTRY1 3 -0.500000 0.866025 0.000000 0.00000 REMARK 290 SMTRY2 3 -0.866025 -0.500000 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 19.81200 REMARK 290 SMTRY1 5 0.500000 0.866025 0.000000 0.00000 REMARK 290 SMTRY2 5 -0.866025 0.500000 0.000000 0.00000 REMARK 290 SMTRY3 5 0.000000 0.000000 1.000000 19.81200 REMARK 290 SMTRY1 6 0.500000 -0.866025 0.000000 0.00000 REMARK 290 SMTRY2 6 0.866025 0.500000 0.000000 0.00000 REMARK 290 SMTRY3 6 0.000000 0.000000 1.000000 19.81200 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 SOFTWARE DETERMINED QUATERNARY STRUCTURE: MONOMERIC REMARK 350 SOFTWARE USED: PISA 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 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 GLY A 719 REMARK 465 SER A 720 REMARK 465 ARG A 721 REMARK 465 GLU A 722 REMARK 465 ARG A 907 REMARK 465 ASN A 908 REMARK 465 ILE A 909

REMARK 470 REMARK 470 MISSING ATOM REMARK 470 THE FOLLOWING RESIDUES HAVE MISSING ATOMS(M=MODEL NUMBER; REMARK 470 RES=RESIDUE NAME; C=CHAIN IDENTIFIER; SSEQ=SEQUENCE NUMBER; REMARK 470 I=INSERTION CODE): REMARK 470 M RES CSSEQI ATOMS REMARK 470 ALA A 723 CB REMARK 470 ASP A 845 CB CG OD1 OD2 REMARK 470 PHE A 906 CB CG CD1 CD2 CE1 CE2 CZ

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 MET A 734 CG MET A 734 SD -0.196 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 MET A 734 CG - SD - CE ANGL. DEV. = -21.7 DEGREES REMARK 500 MET A 763 CA - CB - CG ANGL. DEV. = 17.0 DEGREES REMARK 500 MET A 763 CG - SD - CE ANGL. DEV. = -12.6 DEGREES REMARK 500 CYS A 898 CA - CB - SG ANGL. DEV. = 6.9 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 812 46.49 -87.23 REMARK 500 GLN A 835 -148.41 -95.59 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 A1000 CA REMARK 620 N RES CSSEQI ATOM REMARK 620 1 ASP A 772 OD2 REMARK 620 2 LEU A 789 O 95.4 REMARK 620 3 ARG A 848 O 92.1 92.8 REMARK 620 N 1 2

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 1000

REMARK 900 REMARK 900 RELATED ENTRIES REMARK 900 RELATED ID: 2R1B RELATED DB: PDB REMARK 900 RELATED ID: 2R1D RELATED DB: PDB

DBREF 2R16 A 721 909 UNP Q28146 NRX1A_BOVIN 737 925

SEQADV 2R16 GLY A 719 UNP Q28146 EXPRESSION TAG SEQADV 2R16 SER A 720 UNP Q28146 EXPRESSION TAG SEQADV 2R16 A UNP Q28146 ASP 806 DELETION SEQADV 2R16 A UNP Q28146 CYS 807 DELETION SEQADV 2R16 A UNP Q28146 ILE 808 DELETION SEQADV 2R16 A UNP Q28146 ARG 809 DELETION SEQADV 2R16 A UNP Q28146 ILE 810 DELETION SEQADV 2R16 A UNP Q28146 ASN 811 DELETION SEQADV 2R16 A UNP Q28146 CYS 812 DELETION SEQADV 2R16 A UNP Q28146 ASN 813 DELETION SEQADV 2R16 A UNP Q28146 SER 814 DELETION SEQADV 2R16 GLY A 790 UNP Q28146 SER 815 EXPRESSION TAG

SEQRES 1 A 182 GLY SER ARG GLU ALA THR VAL LEU SER TYR ASP GLY SER SEQRES 2 A 182 MET PHE MET LYS ILE GLN LEU PRO VAL VAL MET HIS THR SEQRES 3 A 182 GLU ALA GLU ASP VAL SER LEU ARG PHE ARG SER GLN ARG SEQRES 4 A 182 ALA TYR GLY ILE LEU MET ALA THR THR SER ARG ASP SER SEQRES 5 A 182 ALA ASP THR LEU ARG LEU GLU LEU ASP ALA GLY ARG VAL SEQRES 6 A 182 LYS LEU THR VAL ASN LEU GLY LYS GLY PRO GLU THR LEU SEQRES 7 A 182 PHE ALA GLY TYR ASN LEU ASN ASP ASN GLU TRP HIS THR SEQRES 8 A 182 VAL ARG VAL VAL ARG ARG GLY LYS SER LEU LYS LEU THR SEQRES 9 A 182 VAL ASP ASP GLN GLN ALA MET THR GLY GLN MET ALA GLY SEQRES 10 A 182 ASP HIS THR ARG LEU GLU PHE HIS ASN ILE GLU THR GLY SEQRES 11 A 182 ILE ILE THR GLU ARG ARG TYR LEU SER SER VAL PRO SER SEQRES 12 A 182 ASN PHE ILE GLY HIS LEU GLN SER LEU THR PHE ASN GLY SEQRES 13 A 182 MET ALA TYR ILE ASP LEU CYS LYS ASN GLY ASP ILE ASP SEQRES 14 A 182 TYR CYS GLU LEU ASN ALA ARG PHE GLY PHE ARG ASN ILE

HET CA A1000 1

HETNAM CA CALCIUM ION

FORMUL 2 CA CA 2+ FORMUL 3 HOH *130(H2 O)

HELIX 1 1 TYR A 886 ASN A 892 1 7

SHEET 1 A 6 ALA A 837 GLN A 841 0 SHEET 2 A 6 SER A 827 VAL A 832 -1 N LEU A 830 O MET A 838 SHEET 3 A 6 HIS A 817 ARG A 824 -1 N ARG A 820 O THR A 831 SHEET 4 A 6 ALA A 746 ARG A 754 -1 N VAL A 749 O VAL A 821 SHEET 5 A 6 ILE A 873 PHE A 881 -1 O GLN A 877 N ARG A 752 SHEET 6 A 6 MET A 884 ALA A 885 -1 O MET A 884 N PHE A 881 SHEET 1 B 7 ALA A 837 GLN A 841 0 SHEET 2 B 7 SER A 827 VAL A 832 -1 N LEU A 830 O MET A 838 SHEET 3 B 7 HIS A 817 ARG A 824 -1 N ARG A 820 O THR A 831 SHEET 4 B 7 ALA A 746 ARG A 754 -1 N VAL A 749 O VAL A 821 SHEET 5 B 7 ILE A 873 PHE A 881 -1 O GLN A 877 N ARG A 752 SHEET 6 B 7 VAL A 725 ASP A 729 -1 N TYR A 728 O GLY A 874 SHEET 7 B 7 ARG A 903 GLY A 905 -1 O ARG A 903 N SER A 727 SHEET 1 C 7 GLU A 803 ALA A 807 0 SHEET 2 C 7 ARG A 782 ASN A 788 -1 N LEU A 785 O LEU A 805 SHEET 3 C 7 THR A 773 ASP A 779 -1 N GLU A 777 O LYS A 784 SHEET 4 C 7 GLY A 760 THR A 766 -1 N MET A 763 O LEU A 776 SHEET 5 C 7 LEU A 849 THR A 856 -1 O GLU A 855 N ALA A 764 SHEET 6 C 7 MET A 734 THR A 744 -1 N ILE A 736 O ILE A 854 SHEET 7 C 7 CYS A 898 LEU A 900 -1 O GLU A 899 N LYS A 735

SSBOND 1 CYS A 890 CYS A 898 1555 1555 2.02

LINK OD2 ASP A 772 CA CA A1000 1555 1555 2.47 LINK O ALEU A 789 CA CA A1000 1555 1555 2.23 LINK O ARG A 848 CA CA A1000 1555 1555 2.36

SITE 1 AC1 3 ASP A 772 LEU A 789 ARG A 848

CRYST1 90.322 90.322 39.624 90.00 90.00 120.00 P 63 6

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 0.011071 0.006392 0.000000 0.00000

SCALE2 0.000000 0.012784 0.000000 0.00000

SCALE3 0.000000 0.000000 0.025237 0.00000