HEADER HYDROLASE 09-SEP-97 3BC2 TITLE METALLO BETA-LACTAMASE II FROM BACILLUS CEREUS 569/H/9 AT PH 6.0, TITLE 2 MONOCLINIC CRYSTAL FORM COMPND MOL_ID: 1; COMPND 2 MOLECULE: METALLO BETA-LACTAMASE II; COMPND 3 CHAIN: A; COMPND 4 EC: 3.5.2.6 SOURCE MOL_ID: 1; SOURCE 2 ORGANISM_SCIENTIFIC: BACILLUS CEREUS; SOURCE 3 ORGANISM_TAXID: 1396; SOURCE 4 STRAIN: 569/H/9 KEYWDS HYDROLASE, BETA-LACTAMASE, ANTIBIOTIC, METALLOENZYME EXPDTA X-RAY DIFFRACTION AUTHOR S.M.FABIANE,B.J.SUTTON REVDAT 3 09-AUG-23 3BC2 1 REMARK SEQADV LINK REVDAT 2 24-FEB-09 3BC2 1 VERSN REVDAT 1 20-APR-99 3BC2 0 JRNL AUTH S.M.FABIANE,M.K.SOHI,B.J.SUTTON JRNL TITL NULL JRNL REF TO BE PUBLISHED JRNL REFN REMARK 1 REMARK 1 REFERENCE 1 REMARK 1 AUTH S.M.FABIANE,M.K.SOHI,T.WAN,D.J.PAYNE,J.H.BATESON,T.MITCHELL, REMARK 1 AUTH 2 B.J.SUTTON REMARK 1 TITL CRYSTAL STRUCTURE OF THE ZINC-DEPENDENT BETA-LACTAMASE FROM REMARK 1 TITL 2 BACILLUS CEREUS AT 1.9 A RESOLUTION: BINUCLEAR ACTIVE SITE REMARK 1 TITL 3 WITH FEATURES OF A MONONUCLEAR ENZYME REMARK 1 REF BIOCHEMISTRY V. 37 12404 1998 REMARK 1 REFN ISSN 0006-2960 REMARK 2 REMARK 2 RESOLUTION. 1.70 ANGSTROMS. REMARK 3 REMARK 3 REFINEMENT. REMARK 3 PROGRAM : X-PLOR 3.851 REMARK 3 AUTHORS : BRUNGER REMARK 3 REMARK 3 DATA USED IN REFINEMENT. REMARK 3 RESOLUTION RANGE HIGH (ANGSTROMS) : 1.70 REMARK 3 RESOLUTION RANGE LOW (ANGSTROMS) : 8.00 REMARK 3 DATA CUTOFF (SIGMA(F)) : 3.000 REMARK 3 DATA CUTOFF HIGH (ABS(F)) : 100000.000 REMARK 3 DATA CUTOFF LOW (ABS(F)) : 0.1000 REMARK 3 COMPLETENESS (WORKING+TEST) (%) : 73.7 REMARK 3 NUMBER OF REFLECTIONS : 25508 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) : 0.227 REMARK 3 FREE R VALUE : 0.241 REMARK 3 FREE R VALUE TEST SET SIZE (%) : 5.000 REMARK 3 FREE R VALUE TEST SET COUNT : 1274 REMARK 3 ESTIMATED ERROR OF FREE R VALUE : 0.007 REMARK 3 REMARK 3 FIT IN THE HIGHEST RESOLUTION BIN. REMARK 3 TOTAL NUMBER OF BINS USED : 30 REMARK 3 BIN RESOLUTION RANGE HIGH (A) : 1.90 REMARK 3 BIN RESOLUTION RANGE LOW (A) : 1.92 REMARK 3 BIN COMPLETENESS (WORKING+TEST) (%) : 55.00 REMARK 3 REFLECTIONS IN BIN (WORKING SET) : 598 REMARK 3 BIN R VALUE (WORKING SET) : 0.3040 REMARK 3 BIN FREE R VALUE : 0.2580 REMARK 3 BIN FREE R VALUE TEST SET SIZE (%) : 2.80 REMARK 3 BIN FREE R VALUE TEST SET COUNT : 32 REMARK 3 ESTIMATED ERROR OF BIN FREE R VALUE : 0.046 REMARK 3 REMARK 3 NUMBER OF NON-HYDROGEN ATOMS USED IN REFINEMENT. REMARK 3 PROTEIN ATOMS : 1667 REMARK 3 NUCLEIC ACID ATOMS : 0 REMARK 3 HETEROGEN ATOMS : 1 REMARK 3 SOLVENT ATOMS : 258 REMARK 3 REMARK 3 B VALUES. REMARK 3 FROM WILSON PLOT (A**2) : 17.90 REMARK 3 MEAN B VALUE (OVERALL, A**2) : 25.80 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) : 0.25 REMARK 3 ESD FROM SIGMAA (A) : 0.26 REMARK 3 LOW RESOLUTION CUTOFF (A) : 8.00 REMARK 3 REMARK 3 CROSS-VALIDATED ESTIMATED COORDINATE ERROR. REMARK 3 ESD FROM C-V LUZZATI PLOT (A) : 0.27 REMARK 3 ESD FROM C-V SIGMAA (A) : 0.25 REMARK 3 REMARK 3 RMS DEVIATIONS FROM IDEAL VALUES. REMARK 3 BOND LENGTHS (A) : 0.007 REMARK 3 BOND ANGLES (DEGREES) : 1.394 REMARK 3 DIHEDRAL ANGLES (DEGREES) : 24.33 REMARK 3 IMPROPER ANGLES (DEGREES) : 1.288 REMARK 3 REMARK 3 ISOTROPIC THERMAL MODEL : RESTRAINED REMARK 3 REMARK 3 ISOTROPIC THERMAL FACTOR RESTRAINTS. RMS SIGMA REMARK 3 MAIN-CHAIN BOND (A**2) : 2.394 ; 1.500 REMARK 3 MAIN-CHAIN ANGLE (A**2) : 3.526 ; 2.000 REMARK 3 SIDE-CHAIN BOND (A**2) : 3.506 ; 2.000 REMARK 3 SIDE-CHAIN ANGLE (A**2) : 4.994 ; 2.500 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 : PAR2.PRO REMARK 3 PARAMETER FILE 2 : PARW.STELLA REMARK 3 PARAMETER FILE 3 : NULL REMARK 3 PARAMETER FILE 4 : NULL REMARK 3 TOPOLOGY FILE 1 : TOP2.PRO REMARK 3 TOPOLOGY FILE 2 : TOPW.STELLA REMARK 3 TOPOLOGY FILE 3 : TOPH19.PEP REMARK 3 TOPOLOGY FILE 4 : NULL REMARK 3 REMARK 3 OTHER REFINEMENT REMARKS: REMARK 3 DISORDERED REGIONS WERE NOT MODELLED. THEY ARE RESIDUES REMARK 3 5, 6, AND 32 - 38 IN BOTH NCS-RELATED MOLECULES. REMARK 4 REMARK 4 3BC2 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_1000178883. REMARK 200 REMARK 200 EXPERIMENTAL DETAILS REMARK 200 EXPERIMENT TYPE : X-RAY DIFFRACTION REMARK 200 DATE OF DATA COLLECTION : AUG-96 REMARK 200 TEMPERATURE (KELVIN) : 153 REMARK 200 PH : 6.0 REMARK 200 NUMBER OF CRYSTALS USED : 1 REMARK 200 REMARK 200 SYNCHROTRON (Y/N) : Y REMARK 200 RADIATION SOURCE : NSLS REMARK 200 BEAMLINE : X12C REMARK 200 X-RAY GENERATOR MODEL : NULL REMARK 200 MONOCHROMATIC OR LAUE (M/L) : M REMARK 200 WAVELENGTH OR RANGE (A) : 1.1 REMARK 200 MONOCHROMATOR : PAIR OF SINGLE FLAT CRYSTALS REMARK 200 OPTICS : MIRROR REMARK 200 REMARK 200 DETECTOR TYPE : IMAGE PLATE AREA DETECTOR REMARK 200 DETECTOR MANUFACTURER : MARRESEARCH REMARK 200 INTENSITY-INTEGRATION SOFTWARE : DENZO REMARK 200 DATA SCALING SOFTWARE : CCP4 REMARK 200 REMARK 200 NUMBER OF UNIQUE REFLECTIONS : 30934 REMARK 200 RESOLUTION RANGE HIGH (A) : 1.850 REMARK 200 RESOLUTION RANGE LOW (A) : 40.300 REMARK 200 REJECTION CRITERIA (SIGMA(I)) : 5.000 REMARK 200 REMARK 200 OVERALL. REMARK 200 COMPLETENESS FOR RANGE (%) : 96.4 REMARK 200 DATA REDUNDANCY : 2.400 REMARK 200 R MERGE (I) : NULL REMARK 200 R SYM (I) : 0.07300 REMARK 200 FOR THE DATA SET : 5.1400 REMARK 200 REMARK 200 IN THE HIGHEST RESOLUTION SHELL. REMARK 200 HIGHEST RESOLUTION SHELL, RANGE HIGH (A) : 1.85 REMARK 200 HIGHEST RESOLUTION SHELL, RANGE LOW (A) : 1.90 REMARK 200 COMPLETENESS FOR SHELL (%) : 94.5 REMARK 200 DATA REDUNDANCY IN SHELL : 2.20 REMARK 200 R MERGE FOR SHELL (I) : NULL REMARK 200 R SYM FOR SHELL (I) : 0.28200 REMARK 200 FOR SHELL : 2.200 REMARK 200 REMARK 200 DIFFRACTION PROTOCOL: NULL REMARK 200 METHOD USED TO DETERMINE THE STRUCTURE: MOLECULAR REPLACEMENT REMARK 200 SOFTWARE USED: AMORE REMARK 200 STARTING MODEL: PDB ENTRY FOR 1BC2 REMARK 200 REMARK 200 REMARK: NULL REMARK 280 REMARK 280 CRYSTAL REMARK 280 SOLVENT CONTENT, VS (%): 39.00 REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 2.29 REMARK 280 REMARK 280 CRYSTALLIZATION CONDITIONS: PH 6.0 REMARK 290 REMARK 290 CRYSTALLOGRAPHIC SYMMETRY REMARK 290 SYMMETRY OPERATORS FOR SPACE GROUP: C 1 2 1 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 26.72000 REMARK 290 SMTRY2 3 0.000000 1.000000 0.000000 30.80000 REMARK 290 SMTRY3 3 0.000000 0.000000 1.000000 0.00000 REMARK 290 SMTRY1 4 -1.000000 0.000000 0.000000 26.72000 REMARK 290 SMTRY2 4 0.000000 1.000000 0.000000 30.80000 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 400 REMARK 400 COMPOUND REMARK 400 RESIDUES 1 - 4 WERE NOT PRESENT IN CRYSTALLISATION REMARK 400 MATERIAL, AS DETERMINED BY MASS SPECTROSCOPY. 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 SER A 1 REMARK 465 GLN A 2 REMARK 465 LYS A 3 REMARK 465 VAL A 4 REMARK 465 GLU A 5 REMARK 465 LYS A 6 REMARK 465 THR A 7 REMARK 465 SER A 33 REMARK 465 PHE A 34 REMARK 465 ASN A 35 REMARK 465 GLY A 36 REMARK 465 GLU A 37 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 O HOH A 341 O HOH A 345 1.99 REMARK 500 O HOH A 272 O HOH A 345 2.16 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 THR A 15 50.52 91.28 REMARK 500 LEU A 21 -51.71 -129.09 REMARK 500 VAL A 39 123.09 65.46 REMARK 500 ASP A 56 150.22 79.61 REMARK 500 SER A 57 -126.43 -108.87 REMARK 500 PRO A 123 -178.49 -69.47 REMARK 500 GLN A 128 -154.91 -100.72 REMARK 500 SER A 174 -21.48 -178.84 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 ZN A 228 ZN REMARK 620 N RES CSSEQI ATOM REMARK 620 1 HIS A 86 NE2 REMARK 620 2 HIS A 88 ND1 105.1 REMARK 620 3 HIS A 149 NE2 104.7 112.0 REMARK 620 4 HOH A 229 O 104.2 120.0 109.3 REMARK 620 N 1 2 3 REMARK 800 REMARK 800 SITE REMARK 800 SITE_IDENTIFIER: ZN REMARK 800 EVIDENCE_CODE: UNKNOWN REMARK 800 SITE_DESCRIPTION: ZN BINDING SITE. REMARK 800 REMARK 800 SITE_IDENTIFIER: AC1 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE ZN A 228 DBREF 3BC2 A 1 227 UNP P04190 BLA2_BACCE 31 257 SEQADV 3BC2 CSD A 168 UNP P04190 CYS 198 CONFLICT SEQRES 1 A 227 SER GLN LYS VAL GLU LYS THR VAL ILE LYS ASN GLU THR SEQRES 2 A 227 GLY THR ILE SER ILE SER GLN LEU ASN LYS ASN VAL TRP SEQRES 3 A 227 VAL HIS THR GLU LEU GLY SER PHE ASN GLY GLU ALA VAL SEQRES 4 A 227 PRO SER ASN GLY LEU VAL LEU ASN THR SER LYS GLY LEU SEQRES 5 A 227 VAL LEU VAL ASP SER SER TRP ASP ASP LYS LEU THR LYS SEQRES 6 A 227 GLU LEU ILE GLU MET VAL GLU LYS LYS PHE GLN LYS ARG SEQRES 7 A 227 VAL THR ASP VAL ILE ILE THR HIS ALA HIS ALA ASP ARG SEQRES 8 A 227 ILE GLY GLY ILE LYS THR LEU LYS GLU ARG GLY ILE LYS SEQRES 9 A 227 ALA HIS SER THR ALA LEU THR ALA GLU LEU ALA LYS LYS SEQRES 10 A 227 ASN GLY TYR GLU GLU PRO LEU GLY ASP LEU GLN THR VAL SEQRES 11 A 227 THR ASN LEU LYS PHE GLY ASN MET LYS VAL GLU THR PHE SEQRES 12 A 227 TYR PRO GLY LYS GLY HIS THR GLU ASP ASN ILE VAL VAL SEQRES 13 A 227 TRP LEU PRO GLN TYR ASN ILE LEU VAL GLY GLY CSD LEU SEQRES 14 A 227 VAL LYS SER THR SER ALA LYS ASP LEU GLY ASN VAL ALA SEQRES 15 A 227 ASP ALA TYR VAL ASN GLU TRP SER THR SER ILE GLU ASN SEQRES 16 A 227 VAL LEU LYS ARG TYR ARG ASN ILE ASN ALA VAL VAL PRO SEQRES 17 A 227 GLY HIS GLY GLU VAL GLY ASP LYS GLY LEU LEU LEU HIS SEQRES 18 A 227 THR LEU ASP LEU LEU LYS MODRES 3BC2 CSD A 168 CYS 3-SULFINOALANINE HET CSD A 168 8 HET ZN A 228 1 HETNAM CSD 3-SULFINOALANINE HETNAM ZN ZINC ION HETSYN CSD S-CYSTEINESULFINIC ACID; S-SULFINOCYSTEINE FORMUL 1 CSD C3 H7 N O4 S FORMUL 2 ZN ZN 2+ FORMUL 3 HOH *258(H2 O) HELIX 1 HA1 ASP A 60 GLN A 76 5 17 HELIX 2 HA2 HIS A 88 ARG A 101 5IRREGULAR 14 HELIX 3 HA3 THR A 108 ASN A 118 5 11 HELIX 4 HA4 GLU A 188 TYR A 200 5 13 HELIX 5 HA5 LYS A 216 LYS A 227 5 12 SHEET 1 A 6 ILE A 16 GLN A 20 0 SHEET 2 A 6 VAL A 25 GLU A 30 -1 N THR A 29 O SER A 17 SHEET 3 A 6 SER A 41 THR A 48 -1 N VAL A 45 O TRP A 26 SHEET 4 A 6 GLY A 51 VAL A 55 -1 N VAL A 55 O LEU A 44 SHEET 5 A 6 VAL A 79 ILE A 83 1 N THR A 80 O LEU A 52 SHEET 6 A 6 LYS A 104 HIS A 106 1 N LYS A 104 O VAL A 82 SHEET 1 B 5 VAL A 130 PHE A 135 0 SHEET 2 B 5 MET A 138 TYR A 144 -1 N THR A 142 O THR A 131 SHEET 3 B 5 ILE A 154 LEU A 158 -1 N TRP A 157 O GLU A 141 SHEET 4 B 5 ILE A 163 GLY A 167 -1 N VAL A 165 O VAL A 156 SHEET 5 B 5 ALA A 205 PRO A 208 1 N ALA A 205 O LEU A 164 LINK C GLY A 167 N CSD A 168 1555 1555 1.32 LINK C CSD A 168 N LEU A 169 1555 1555 1.33 LINK NE2 HIS A 86 ZN ZN A 228 1555 1555 2.27 LINK ND1 HIS A 88 ZN ZN A 228 1555 1555 1.95 LINK NE2 HIS A 149 ZN ZN A 228 1555 1555 2.11 LINK ZN ZN A 228 O HOH A 229 1555 1555 2.50 SITE 1 ZN 6 HIS A 86 HIS A 88 ASP A 90 HIS A 149 SITE 2 ZN 6 CSD A 168 HIS A 210 SITE 1 AC1 6 HIS A 86 HIS A 88 HIS A 149 CSD A 168 SITE 2 AC1 6 HOH A 229 HOH A 364 CRYST1 53.440 61.600 69.830 90.00 93.27 90.00 C 1 2 1 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 0.018713 0.000000 0.001069 0.00000 SCALE2 0.000000 0.016234 0.000000 0.00000 SCALE3 0.000000 0.000000 0.014344 0.00000