HEADER TRANSFERASE 12-JAN-09 3FTD TITLE CRYSTAL STRUCTURE OF A. AEOLICUS KSGA AT 1.44-ANGSTROM RESOLUTION COMPND MOL_ID: 1; COMPND 2 MOLECULE: DIMETHYLADENOSINE TRANSFERASE; COMPND 3 CHAIN: A; COMPND 4 SYNONYM: S-ADENOSYLMETHIONINE-6-N', N'-ADENOSYL(RRNA) COMPND 5 DIMETHYLTRANSFERASE, 16S RRNA DIMETHYLASE, HIGH LEVEL KASUGAMYCIN COMPND 6 RESISTANCE PROTEIN KSGA, KASUGAMYCIN DIMETHYLTRANSFERASE; COMPND 7 EC: 2.1.1.-; COMPND 8 ENGINEERED: YES SOURCE MOL_ID: 1; SOURCE 2 ORGANISM_SCIENTIFIC: AQUIFEX AEOLICUS; SOURCE 3 ORGANISM_TAXID: 224324; SOURCE 4 STRAIN: VF5; SOURCE 5 GENE: AQ_1816, KSGA; SOURCE 6 EXPRESSION_SYSTEM: ESCHERICHIA COLI; SOURCE 7 EXPRESSION_SYSTEM_TAXID: 562; SOURCE 8 EXPRESSION_SYSTEM_STRAIN: BL21-CODONPLUS(DE3)-RIL; SOURCE 9 EXPRESSION_SYSTEM_VECTOR_TYPE: PLASMID; SOURCE 10 EXPRESSION_SYSTEM_VECTOR: PDONR221; SOURCE 11 EXPRESSION_SYSTEM_PLASMID: PBA1939 KEYWDS KSGA, ROSSMANN-LIKE FOLD, RNA METHYLTRANSFERASE, MTASE, ANTIBIOTIC KEYWDS 2 RESISTANCE, METHYLTRANSFERASE, RNA-BINDING, RRNA PROCESSING, S- KEYWDS 3 ADENOSYL-L-METHIONINE, TRANSFERASE EXPDTA X-RAY DIFFRACTION AUTHOR C.TU,X.JI REVDAT 2 13-JUL-11 3FTD 1 VERSN REVDAT 1 24-MAR-09 3FTD 0 JRNL AUTH C.TU,J.E.TROPEA,B.P.AUSTIN,D.L.COURT,D.S.WAUGH,X.JI JRNL TITL STRUCTURAL BASIS FOR BINDING OF RNA AND COFACTOR BY A KSGA JRNL TITL 2 METHYLTRANSFERASE. JRNL REF STRUCTURE V. 17 374 2009 JRNL REFN ISSN 0969-2126 JRNL PMID 19278652 JRNL DOI 10.1016/J.STR.2009.01.010 REMARK 2 REMARK 2 RESOLUTION. 1.44 ANGSTROMS. REMARK 3 REMARK 3 REFINEMENT. REMARK 3 PROGRAM : PHENIX REMARK 3 AUTHORS : PAUL ADAMS,PAVEL AFONINE,VICENT CHEN,IAN REMARK 3 : DAVIS,KRESHNA GOPAL,RALF GROSSE- REMARK 3 : KUNSTLEVE,LI-WEI HUNG,ROBERT IMMORMINO, REMARK 3 : TOM IOERGER,AIRLIE MCCOY,ERIK MCKEE,NIGEL REMARK 3 : MORIARTY,REETAL PAI,RANDY READ,JANE REMARK 3 : RICHARDSON,DAVID RICHARDSON,TOD ROMO,JIM REMARK 3 : SACCHETTINI,NICHOLAS SAUTER,JACOB SMITH, REMARK 3 : LAURENT STORONI,TOM TERWILLIGER,PETER REMARK 3 : ZWART REMARK 3 REMARK 3 REFINEMENT TARGET : ENGH & HUBER REMARK 3 REMARK 3 DATA USED IN REFINEMENT. REMARK 3 RESOLUTION RANGE HIGH (ANGSTROMS) : 1.44 REMARK 3 RESOLUTION RANGE LOW (ANGSTROMS) : 28.69 REMARK 3 MIN(FOBS/SIGMA_FOBS) : NULL REMARK 3 COMPLETENESS FOR RANGE (%) : 94.5 REMARK 3 NUMBER OF REFLECTIONS : 37676 REMARK 3 REMARK 3 FIT TO DATA USED IN REFINEMENT. REMARK 3 R VALUE (WORKING + TEST SET) : 0.161 REMARK 3 R VALUE (WORKING SET) : 0.159 REMARK 3 FREE R VALUE : 0.200 REMARK 3 FREE R VALUE TEST SET SIZE (%) : 5.310 REMARK 3 FREE R VALUE TEST SET COUNT : 2000 REMARK 3 REMARK 3 FIT TO DATA USED IN REFINEMENT (IN BINS). REMARK 3 BIN RESOLUTION RANGE COMPL. NWORK NFREE RWORK RFREE REMARK 3 1 28.6972 - 3.4740 1.00 2885 162 0.1619 0.1853 REMARK 3 2 3.4740 - 2.7581 1.00 2751 153 0.1565 0.1600 REMARK 3 3 2.7581 - 2.4097 1.00 2721 153 0.1627 0.2048 REMARK 3 4 2.4097 - 2.1895 1.00 2701 152 0.1469 0.1958 REMARK 3 5 2.1895 - 2.0326 1.00 2698 152 0.1322 0.1814 REMARK 3 6 2.0326 - 1.9128 1.00 2672 149 0.1305 0.1891 REMARK 3 7 1.9128 - 1.8170 1.00 2678 150 0.1319 0.1970 REMARK 3 8 1.8170 - 1.7379 0.99 2645 149 0.1416 0.2523 REMARK 3 9 1.7379 - 1.6710 0.99 2635 147 0.1457 0.1909 REMARK 3 10 1.6710 - 1.6134 0.97 2580 145 0.1530 0.2433 REMARK 3 11 1.6134 - 1.5629 0.94 2530 141 0.1660 0.2438 REMARK 3 12 1.5629 - 1.5182 0.89 2360 133 0.1857 0.2428 REMARK 3 13 1.5182 - 1.4783 0.79 2083 117 0.2195 0.2727 REMARK 3 14 1.4783 - 1.4400 0.66 1737 97 0.2929 0.3355 REMARK 3 REMARK 3 BULK SOLVENT MODELLING. REMARK 3 METHOD USED : FLAT BULK SOLVENT MODEL REMARK 3 SOLVENT RADIUS : 1.11 REMARK 3 SHRINKAGE RADIUS : 0.90 REMARK 3 K_SOL : 0.38 REMARK 3 B_SOL : 50.04 REMARK 3 REMARK 3 ERROR ESTIMATES. REMARK 3 COORDINATE ERROR (MAXIMUM-LIKELIHOOD BASED) : 0.170 REMARK 3 PHASE ERROR (DEGREES, MAXIMUM-LIKELIHOOD BASED) : NULL REMARK 3 REMARK 3 B VALUES. REMARK 3 FROM WILSON PLOT (A**2) : 14.90 REMARK 3 MEAN B VALUE (OVERALL, A**2) : 22.00 REMARK 3 OVERALL ANISOTROPIC B VALUE. REMARK 3 B11 (A**2) : -0.76000 REMARK 3 B22 (A**2) : 0.00000 REMARK 3 B33 (A**2) : 0.00000 REMARK 3 B12 (A**2) : -0.74000 REMARK 3 B13 (A**2) : 1.50000 REMARK 3 B23 (A**2) : 0.00000 REMARK 3 REMARK 3 TWINNING INFORMATION. REMARK 3 FRACTION: NULL REMARK 3 OPERATOR: NULL REMARK 3 REMARK 3 DEVIATIONS FROM IDEAL VALUES. REMARK 3 RMSD COUNT REMARK 3 BOND : 0.005 NULL REMARK 3 ANGLE : NULL NULL REMARK 3 CHIRALITY : NULL NULL REMARK 3 PLANARITY : NULL NULL REMARK 3 DIHEDRAL : 14.495 NULL REMARK 3 REMARK 3 TLS DETAILS REMARK 3 NUMBER OF TLS GROUPS : NULL REMARK 3 REMARK 3 NCS DETAILS REMARK 3 NUMBER OF NCS GROUPS : NULL REMARK 3 REMARK 3 OTHER REFINEMENT REMARKS: NULL REMARK 4 REMARK 4 3FTD COMPLIES WITH FORMAT V. 3.30, 13-JUL-11 REMARK 100 REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY RCSB ON 13-JAN-09. REMARK 100 THE RCSB ID CODE IS RCSB051018. REMARK 200 REMARK 200 EXPERIMENTAL DETAILS REMARK 200 EXPERIMENT TYPE : X-RAY DIFFRACTION REMARK 200 DATE OF DATA COLLECTION : 13-MAR-08 REMARK 200 TEMPERATURE (KELVIN) : 100 REMARK 200 PH : 6.5 REMARK 200 NUMBER OF CRYSTALS USED : 1 REMARK 200 REMARK 200 SYNCHROTRON (Y/N) : Y REMARK 200 RADIATION SOURCE : APS REMARK 200 BEAMLINE : 22-BM REMARK 200 X-RAY GENERATOR MODEL : NULL REMARK 200 MONOCHROMATIC OR LAUE (M/L) : M REMARK 200 WAVELENGTH OR RANGE (A) : 1.0000 REMARK 200 MONOCHROMATOR : SI(111) ROSENBAUM-ROCK DOUBLE REMARK 200 CRYSTAL REMARK 200 OPTICS : MIRRORS REMARK 200 REMARK 200 DETECTOR TYPE : CCD REMARK 200 DETECTOR MANUFACTURER : MARMOSAIC 225 MM CCD REMARK 200 INTENSITY-INTEGRATION SOFTWARE : HKL-2000 REMARK 200 DATA SCALING SOFTWARE : HKL-2000 REMARK 200 REMARK 200 NUMBER OF UNIQUE REFLECTIONS : 38594 REMARK 200 RESOLUTION RANGE HIGH (A) : 1.440 REMARK 200 RESOLUTION RANGE LOW (A) : 30.000 REMARK 200 REJECTION CRITERIA (SIGMA(I)) : -3.000 REMARK 200 REMARK 200 OVERALL. REMARK 200 COMPLETENESS FOR RANGE (%) : 97.0 REMARK 200 DATA REDUNDANCY : 6.900 REMARK 200 R MERGE (I) : 0.06800 REMARK 200 R SYM (I) : NULL REMARK 200 FOR THE DATA SET : 24.6000 REMARK 200 REMARK 200 IN THE HIGHEST RESOLUTION SHELL. REMARK 200 HIGHEST RESOLUTION SHELL, RANGE HIGH (A) : 1.44 REMARK 200 HIGHEST RESOLUTION SHELL, RANGE LOW (A) : 1.48 REMARK 200 COMPLETENESS FOR SHELL (%) : 66.0 REMARK 200 DATA REDUNDANCY IN SHELL : 2.70 REMARK 200 R MERGE FOR SHELL (I) : 0.44600 REMARK 200 R SYM FOR SHELL (I) : 0.49300 REMARK 200 FOR SHELL : 1.900 REMARK 200 REMARK 200 DIFFRACTION PROTOCOL: SINGLE WAVELENGTH REMARK 200 METHOD USED TO DETERMINE THE STRUCTURE: MOLECULAR REPLACEMENT REMARK 200 SOFTWARE USED: PHASER REMARK 200 STARTING MODEL: PDB ENTRY 3FTC REMARK 200 REMARK 200 REMARK: NULL REMARK 280 REMARK 280 CRYSTAL REMARK 280 SOLVENT CONTENT, VS (%): 35.31 REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 1.90 REMARK 280 REMARK 280 CRYSTALLIZATION CONDITIONS: 20% PEG MME 5000, 0.1 M BIS-TRIS, PH REMARK 280 6.5, VAPOR DIFFUSION, SITTING DROP, TEMPERATURE 292K 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 21.54350 REMARK 290 SMTRY2 2 0.000000 -1.000000 0.000000 0.00000 REMARK 290 SMTRY3 2 0.000000 0.000000 1.000000 43.80900 REMARK 290 SMTRY1 3 -1.000000 0.000000 0.000000 0.00000 REMARK 290 SMTRY2 3 0.000000 1.000000 0.000000 28.69150 REMARK 290 SMTRY3 3 0.000000 0.000000 -1.000000 43.80900 REMARK 290 SMTRY1 4 1.000000 0.000000 0.000000 21.54350 REMARK 290 SMTRY2 4 0.000000 -1.000000 0.000000 28.69150 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 300 REMARK: THE BIOLOGICAL ASSEMBLY CORRESPONDS TO THE CONTENT OF THE REMARK 300 ASYMMETRIC UNIT. 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 SER A 0 REMARK 465 MET A 1 REMARK 465 VAL A 2 REMARK 465 ARG A 3 REMARK 465 LEU A 4 REMARK 465 LYS A 5 REMARK 465 LYS A 6 REMARK 465 GLY A 247 REMARK 465 GLU A 248 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 PRO A 52 31.88 -75.68 REMARK 500 ASN A 182 92.06 -160.08 REMARK 500 REMARK 500 REMARK: NULL REMARK 525 REMARK 525 SOLVENT REMARK 525 REMARK 525 THE SOLVENT MOLECULES HAVE CHAIN IDENTIFIERS THAT REMARK 525 INDICATE THE POLYMER CHAIN WITH WHICH THEY ARE MOST REMARK 525 CLOSELY ASSOCIATED. THE REMARK LISTS ALL THE SOLVENT REMARK 525 MOLECULES WHICH ARE MORE THAN 5A AWAY FROM THE REMARK 525 NEAREST POLYMER CHAIN (M = MODEL NUMBER; REMARK 525 RES=RESIDUE NAME; C=CHAIN IDENTIFIER; SSEQ=SEQUENCE REMARK 525 NUMBER; I=INSERTION CODE): REMARK 525 REMARK 525 M RES CSSEQI REMARK 525 HOH A 253 DISTANCE = 5.20 ANGSTROMS REMARK 525 HOH A 457 DISTANCE = 5.44 ANGSTROMS REMARK 900 REMARK 900 RELATED ENTRIES REMARK 900 RELATED ID: 1QYR RELATED DB: PDB REMARK 900 LIGAND-FREE E. COLI KSGA REMARK 900 RELATED ID: 1ZQ9 RELATED DB: PDB REMARK 900 H. SAPIENS DIM1 IN COMPLEX WITH SAM REMARK 900 RELATED ID: 1G38 RELATED DB: PDB REMARK 900 M.TAQI IN COMPLEX WITH DNA AND COFACTOR ANALOG NEA REMARK 900 RELATED ID: 3FTC RELATED DB: PDB REMARK 900 LIGAND-FREE A. AEOLICUS KSGA (KSGA2) REMARK 900 RELATED ID: 3FTE RELATED DB: PDB REMARK 900 A. AEOLICUS KSGA IN COMPLEX WITH RNA (KSGA-RNA) REMARK 900 RELATED ID: 3FTF RELATED DB: PDB REMARK 900 A. AEOLICUS KSGA IN COMPLEX WITH RNA AND SAH (KSGA-RNA-SAH) DBREF 3FTD A 1 248 UNP O67680 KSGA_AQUAE 1 248 SEQADV 3FTD SER A 0 UNP O67680 EXPRESSION TAG SEQRES 1 A 249 SER MET VAL ARG LEU LYS LYS SER PHE GLY GLN HIS LEU SEQRES 2 A 249 LEU VAL SER GLU GLY VAL LEU LYS LYS ILE ALA GLU GLU SEQRES 3 A 249 LEU ASN ILE GLU GLU GLY ASN THR VAL VAL GLU VAL GLY SEQRES 4 A 249 GLY GLY THR GLY ASN LEU THR LYS VAL LEU LEU GLN HIS SEQRES 5 A 249 PRO LEU LYS LYS LEU TYR VAL ILE GLU LEU ASP ARG GLU SEQRES 6 A 249 MET VAL GLU ASN LEU LYS SER ILE GLY ASP GLU ARG LEU SEQRES 7 A 249 GLU VAL ILE ASN GLU ASP ALA SER LYS PHE PRO PHE CYS SEQRES 8 A 249 SER LEU GLY LYS GLU LEU LYS VAL VAL GLY ASN LEU PRO SEQRES 9 A 249 TYR ASN VAL ALA SER LEU ILE ILE GLU ASN THR VAL TYR SEQRES 10 A 249 ASN LYS ASP CYS VAL PRO LEU ALA VAL PHE MET VAL GLN SEQRES 11 A 249 LYS GLU VAL ALA GLU LYS LEU GLN GLY LYS LYS ASP THR SEQRES 12 A 249 GLY TRP LEU SER VAL PHE VAL ARG THR PHE TYR ASP VAL SEQRES 13 A 249 ASN TYR VAL MET THR VAL PRO PRO ARG PHE PHE VAL PRO SEQRES 14 A 249 PRO PRO LYS VAL GLN SER ALA VAL ILE LYS LEU VAL LYS SEQRES 15 A 249 ASN GLU LYS PHE PRO VAL LYS ASP LEU LYS ASN TYR LYS SEQRES 16 A 249 LYS PHE LEU THR LYS ILE PHE GLN ASN ARG ARG LYS VAL SEQRES 17 A 249 LEU ARG LYS LYS ILE PRO GLU GLU LEU LEU LYS GLU ALA SEQRES 18 A 249 GLY ILE ASN PRO ASP ALA ARG VAL GLU GLN LEU SER LEU SEQRES 19 A 249 GLU ASP PHE PHE LYS LEU TYR ARG LEU ILE GLU ASP SER SEQRES 20 A 249 GLY GLU FORMUL 2 HOH *277(H2 O) HELIX 1 1 SER A 15 LEU A 26 1 12 HELIX 2 2 GLY A 40 LEU A 49 1 10 HELIX 3 3 ASP A 62 LYS A 70 1 9 HELIX 4 4 PRO A 88 LEU A 92 5 5 HELIX 5 5 VAL A 106 ASN A 117 1 12 HELIX 6 6 LYS A 118 VAL A 121 5 4 HELIX 7 7 LYS A 130 GLY A 138 1 9 HELIX 8 8 GLY A 143 PHE A 152 1 10 HELIX 9 9 PRO A 162 ARG A 164 5 3 HELIX 10 10 ASP A 189 GLN A 202 1 14 HELIX 11 11 VAL A 207 LYS A 211 5 5 HELIX 12 12 PRO A 213 ALA A 220 1 8 HELIX 13 13 ARG A 227 LEU A 231 5 5 HELIX 14 14 SER A 232 ASP A 245 1 14 SHEET 1 A 2 LEU A 13 VAL A 14 0 SHEET 2 A 2 PHE A 166 VAL A 167 -1 O VAL A 167 N LEU A 13 SHEET 1 B 7 LEU A 77 ILE A 80 0 SHEET 2 B 7 LYS A 55 ILE A 59 1 N VAL A 58 O ILE A 80 SHEET 3 B 7 THR A 33 GLY A 38 1 N GLU A 36 O TYR A 57 SHEET 4 B 7 LEU A 96 ASN A 101 1 O LYS A 97 N VAL A 35 SHEET 5 B 7 LEU A 123 GLN A 129 1 O VAL A 125 N VAL A 98 SHEET 6 B 7 SER A 174 LYS A 181 -1 O LEU A 179 N ALA A 124 SHEET 7 B 7 TYR A 153 VAL A 161 -1 N ASP A 154 O VAL A 180 SSBOND 1 CYS A 90 CYS A 120 1555 1555 2.03 CISPEP 1 VAL A 167 PRO A 168 0 -1.44 CRYST1 43.087 57.383 87.618 90.00 90.00 90.00 P 21 21 21 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 0.023209 0.000000 0.000000 0.00000 SCALE2 0.000000 0.017427 0.000000 0.00000 SCALE3 0.000000 0.000000 0.011413 0.00000