HEADER RNA 02-OCT-06 2IL9 TITLE CRYSTAL STRUCTURE OF PLAUTIA STALI INTESTINE VIRUS INTERGENIC REGION TITLE 2 INTERNAL RIBOSOME ENTRY SITE RIBOSOMAL BINDING DOMAIN RNA AT 3.1 TITLE 3 ANGSTROMS COMPND MOL_ID: 1; COMPND 2 MOLECULE: RIBOSOMAL BINDING DOMAIN OF THE IRES RNA; COMPND 3 CHAIN: A, M; COMPND 4 ENGINEERED: YES; COMPND 5 OTHER_DETAILS: RESIDUES 6084, INS. CODE A-F, AND 6119, INS. CODE A-E, COMPND 6 ARE INSERTED TO INDUCE CRYSTALLIZATION SOURCE MOL_ID: 1; SOURCE 2 SYNTHETIC: YES; SOURCE 3 OTHER_DETAILS: SEQUENCE OCCURS NATURALLY IN PLAUTIA STALI INTESTINE SOURCE 4 VIRUS KEYWDS RNA; IRES; RIBOSOMAL BINDING DOMAIN; PSIV; UNDER WOUND HELIX; DOUBLE- KEYWDS 2 NESTED PSEUDOKNOT, RNA EXPDTA X-RAY DIFFRACTION AUTHOR J.S.PFINGSTEN,D.A.COSTANTINO,J.S.KIEFT REVDAT 3 21-FEB-24 2IL9 1 REMARK REVDAT 2 24-FEB-09 2IL9 1 VERSN REVDAT 1 13-FEB-07 2IL9 0 JRNL AUTH J.S.PFINGSTEN,D.A.COSTANTINO,J.S.KIEFT JRNL TITL STRUCTURAL BASIS FOR RIBOSOME RECRUITMENT AND MANIPULATION JRNL TITL 2 BY A VIRAL IRES RNA JRNL REF SCIENCE V. 314 1450 2006 JRNL REFN ISSN 0036-8075 JRNL PMID 17124290 JRNL DOI 10.1126/SCIENCE.1133281 REMARK 2 REMARK 2 RESOLUTION. 3.10 ANGSTROMS. REMARK 3 REMARK 3 REFINEMENT. REMARK 3 PROGRAM : CNS 1.1 REMARK 3 AUTHORS : BRUNGER,ADAMS,CLORE,DELANO,GROS,GROSSE- REMARK 3 : KUNSTLEVE,JIANG,KUSZEWSKI,NILGES,PANNU, REMARK 3 : READ,RICE,SIMONSON,WARREN REMARK 3 REMARK 3 REFINEMENT TARGET : NULL REMARK 3 REMARK 3 DATA USED IN REFINEMENT. REMARK 3 RESOLUTION RANGE HIGH (ANGSTROMS) : 3.10 REMARK 3 RESOLUTION RANGE LOW (ANGSTROMS) : 16.97 REMARK 3 DATA CUTOFF (SIGMA(F)) : 0.000 REMARK 3 DATA CUTOFF HIGH (ABS(F)) : 74429.094 REMARK 3 DATA CUTOFF LOW (ABS(F)) : 0.0000 REMARK 3 COMPLETENESS (WORKING+TEST) (%) : 92.4 REMARK 3 NUMBER OF REFLECTIONS : 26973 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) : 0.253 REMARK 3 FREE R VALUE : 0.294 REMARK 3 FREE R VALUE TEST SET SIZE (%) : 9.900 REMARK 3 FREE R VALUE TEST SET COUNT : 2683 REMARK 3 ESTIMATED ERROR OF FREE R VALUE : 0.006 REMARK 3 REMARK 3 FIT IN THE HIGHEST RESOLUTION BIN. REMARK 3 TOTAL NUMBER OF BINS USED : 6 REMARK 3 BIN RESOLUTION RANGE HIGH (A) : 3.10 REMARK 3 BIN RESOLUTION RANGE LOW (A) : 3.29 REMARK 3 BIN COMPLETENESS (WORKING+TEST) (%) : 80.80 REMARK 3 REFLECTIONS IN BIN (WORKING SET) : 3521 REMARK 3 BIN R VALUE (WORKING SET) : 0.3360 REMARK 3 BIN FREE R VALUE : 0.3910 REMARK 3 BIN FREE R VALUE TEST SET SIZE (%) : 10.10 REMARK 3 BIN FREE R VALUE TEST SET COUNT : 397 REMARK 3 ESTIMATED ERROR OF BIN FREE R VALUE : 0.020 REMARK 3 REMARK 3 NUMBER OF NON-HYDROGEN ATOMS USED IN REFINEMENT. REMARK 3 PROTEIN ATOMS : 0 REMARK 3 NUCLEIC ACID ATOMS : 5665 REMARK 3 HETEROGEN ATOMS : 0 REMARK 3 SOLVENT ATOMS : 0 REMARK 3 REMARK 3 B VALUES. REMARK 3 FROM WILSON PLOT (A**2) : NULL REMARK 3 MEAN B VALUE (OVERALL, A**2) : 87.60 REMARK 3 OVERALL ANISOTROPIC B VALUE. REMARK 3 B11 (A**2) : -1.15000 REMARK 3 B22 (A**2) : -1.15000 REMARK 3 B33 (A**2) : 2.29000 REMARK 3 B12 (A**2) : 13.95000 REMARK 3 B13 (A**2) : 0.00000 REMARK 3 B23 (A**2) : 0.00000 REMARK 3 REMARK 3 ESTIMATED COORDINATE ERROR. REMARK 3 ESD FROM LUZZATI PLOT (A) : 0.41 REMARK 3 ESD FROM SIGMAA (A) : 0.47 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) : 0.50 REMARK 3 ESD FROM C-V SIGMAA (A) : 0.57 REMARK 3 REMARK 3 RMS DEVIATIONS FROM IDEAL VALUES. REMARK 3 BOND LENGTHS (A) : 0.005 REMARK 3 BOND ANGLES (DEGREES) : 1.000 REMARK 3 DIHEDRAL ANGLES (DEGREES) : 15.10 REMARK 3 IMPROPER ANGLES (DEGREES) : 1.390 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) : 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 BULK SOLVENT MODELING. REMARK 3 METHOD USED : FLAT MODEL REMARK 3 KSOL : 0.27 REMARK 3 BSOL : 37.00 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 : PROTEIN_REP.PARAM REMARK 3 PARAMETER FILE 2 : DNA-RNA_REP.PARAM REMARK 3 PARAMETER FILE 3 : WATER_REP.PARAM REMARK 3 PARAMETER FILE 4 : ION.PARAM REMARK 3 PARAMETER FILE 5 : IRHEX.PARAM REMARK 3 PARAMETER FILE 6 : NULL REMARK 3 TOPOLOGY FILE 1 : PROTEIN.TOP REMARK 3 TOPOLOGY FILE 2 : DNA-RNA.TOP REMARK 3 TOPOLOGY FILE 3 : WATER.TOP REMARK 3 TOPOLOGY FILE 4 : IRHEX.TOP REMARK 3 TOPOLOGY FILE 5 : ION.TOP REMARK 3 TOPOLOGY FILE 6 : NULL REMARK 3 REMARK 3 OTHER REFINEMENT REMARKS: NULL REMARK 4 REMARK 4 2IL9 COMPLIES WITH FORMAT V. 3.30, 13-JUL-11 REMARK 100 REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY RCSB ON 17-OCT-06. REMARK 100 THE DEPOSITION ID IS D_1000039709. REMARK 200 REMARK 200 EXPERIMENTAL DETAILS REMARK 200 EXPERIMENT TYPE : X-RAY DIFFRACTION REMARK 200 DATE OF DATA COLLECTION : 25-APR-06; 29-MAY-06 REMARK 200 TEMPERATURE (KELVIN) : 100; 100 REMARK 200 PH : 5.6 REMARK 200 NUMBER OF CRYSTALS USED : 1 REMARK 200 REMARK 200 SYNCHROTRON (Y/N) : Y; N REMARK 200 RADIATION SOURCE : ALS; ROTATING ANODE REMARK 200 BEAMLINE : 8.2.1; NULL REMARK 200 X-RAY GENERATOR MODEL : NULL; RIGAKU REMARK 200 MONOCHROMATIC OR LAUE (M/L) : M; M REMARK 200 WAVELENGTH OR RANGE (A) : 1.1053,1.1057,1.1004; 1.5418 REMARK 200 MONOCHROMATOR : NULL; NULL REMARK 200 OPTICS : NULL; NULL REMARK 200 REMARK 200 DETECTOR TYPE : CCD; IMAGE PLATE REMARK 200 DETECTOR MANUFACTURER : ADSC QUANTUM 210; RIGAKU RAXIS REMARK 200 IV REMARK 200 INTENSITY-INTEGRATION SOFTWARE : HKL-2000 REMARK 200 DATA SCALING SOFTWARE : HKL-2000 REMARK 200 REMARK 200 NUMBER OF UNIQUE REFLECTIONS : 26973 REMARK 200 RESOLUTION RANGE HIGH (A) : 3.100 REMARK 200 RESOLUTION RANGE LOW (A) : 16.970 REMARK 200 REJECTION CRITERIA (SIGMA(I)) : NULL REMARK 200 REMARK 200 OVERALL. REMARK 200 COMPLETENESS FOR RANGE (%) : NULL REMARK 200 DATA REDUNDANCY : NULL REMARK 200 R MERGE (I) : NULL REMARK 200 R SYM (I) : NULL REMARK 200 FOR THE DATA SET : NULL REMARK 200 REMARK 200 IN THE HIGHEST RESOLUTION SHELL. REMARK 200 HIGHEST RESOLUTION SHELL, RANGE HIGH (A) : NULL REMARK 200 HIGHEST RESOLUTION SHELL, RANGE LOW (A) : NULL REMARK 200 COMPLETENESS FOR SHELL (%) : NULL REMARK 200 DATA REDUNDANCY IN SHELL : NULL REMARK 200 R MERGE FOR SHELL (I) : NULL REMARK 200 R SYM FOR SHELL (I) : NULL REMARK 200 FOR SHELL : NULL REMARK 200 REMARK 200 DIFFRACTION PROTOCOL: MAD; SINGLE WAVELENGTH REMARK 200 METHOD USED TO DETERMINE THE STRUCTURE: MAD REMARK 200 SOFTWARE USED: SOLVE 2.03 REMARK 200 STARTING MODEL: NULL REMARK 200 REMARK 200 REMARK: NULL REMARK 280 REMARK 280 CRYSTAL REMARK 280 SOLVENT CONTENT, VS (%): 72.86 REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 4.53 REMARK 280 REMARK 280 CRYSTALLIZATION CONDITIONS: 15% MPD, 150 MM MGACETATE, 0.5 MM REMARK 280 SPERMIDINE; CRYOPROTECTED WITH 20% MPD, 150 MM MGACETATE, 50 MM REMARK 280 NA-MES PH 5.6, 5 MM IRIDIUM (III) HEXAMMINE, VAPOR DIFFUSION, REMARK 280 SITTING DROP, TEMPERATURE 303K. 15% MPD, 100 MM MGACETATE, 0.5 REMARK 280 MM SPERMIDINE; CRYOPROTECTED WITH 20% MPD, 100 MM MGACETATE, 50 REMARK 280 MM NA-MES PH 5.6, 5% ISOPROPANOL, VAPOR DIFFUSION, SITTING DROP, REMARK 280 TEMPERATURE 303K 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 80.21250 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 80.21250 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 80.21250 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: TWO MOLECULES IN ASU FORM A DOMAIN-SWAP DIMER. REGION 1 OF REMARK 300 CHAIN A AND REGION 2 OF CHAIN M FORM THE BIOLOGICAL UNIT. LIKEWISE REMARK 300 REGION 1 OF CHAIN M AND REGION 2 OF CHAIN A FORM THE SECOND COPY OF REMARK 300 THE BIOLOGICAL 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: DIMERIC REMARK 350 APPLY THE FOLLOWING TO CHAINS: A, M 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 G A 6002 REMARK 465 U A 6036 REMARK 465 U A 6037 REMARK 465 U A 6038 REMARK 465 C A 6072 REMARK 465 U A 6073 REMARK 465 U A 6074 REMARK 465 G M 6002 REMARK 465 U M 6037 REMARK 465 U M 6038 REMARK 465 U M 6068 REMARK 465 A M 6069 REMARK 465 G M 6070 REMARK 465 U M 6071 REMARK 465 C M 6072 REMARK 465 U M 6073 REMARK 465 U M 6074 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 C A6003 P OP1 OP2 REMARK 470 C A6039 P OP1 OP2 REMARK 470 A A6075 P OP1 OP2 REMARK 470 C M6003 P OP1 OP2 REMARK 470 C M6039 P OP1 OP2 REMARK 470 A M6075 P OP1 OP2 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 O6 G M 6115 N3 C M 6127 2.15 REMARK 500 N3 U A 6109 N6 A A 6131 2.16 REMARK 500 N2 G M 6078 N4 C M 6114 2.18 REMARK 500 N1 G M 6116 O2 C M 6126 2.18 REMARK 500 N1 A M 6117 O2 U M 6125 2.18 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 C A6084A N1 - C1' - C2' ANGL. DEV. = -6.7 DEGREES REMARK 500 A A6131 N9 - C1' - C2' ANGL. DEV. = 10.6 DEGREES 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 A A6014 0.05 SIDE CHAIN REMARK 500 C A6119 0.07 SIDE CHAIN REMARK 500 G A6138 0.06 SIDE CHAIN REMARK 500 U M6054 0.08 SIDE CHAIN REMARK 500 G M6119E 0.07 SIDE CHAIN REMARK 500 G M6136 0.05 SIDE CHAIN REMARK 500 REMARK 500 REMARK: NULL DBREF 2IL9 A 6002 6146 PDB 2IL9 2IL9 6002 6146 DBREF 2IL9 M 6002 6146 PDB 2IL9 2IL9 6002 6146 SEQRES 1 A 142 G C U G A C U A U G U G A SEQRES 2 A 142 U C U U A U U A A A A U U SEQRES 3 A 142 A G G U U A A A U U U C G SEQRES 4 A 142 A G G U U A A A A A U A G SEQRES 5 A 142 U U U U A A U A U U G C U SEQRES 6 A 142 A U A G U C U U A G A G G SEQRES 7 A 142 U C U U G C G A A A G C U SEQRES 8 A 142 U A C C A C A C A A G A U SEQRES 9 A 142 G G A C C G G A G C G A A SEQRES 10 A 142 A G C U C C A A U A U C U SEQRES 11 A 142 A G U G U A C C C U C G SEQRES 1 M 142 G C U G A C U A U G U G A SEQRES 2 M 142 U C U U A U U A A A A U U SEQRES 3 M 142 A G G U U A A A U U U C G SEQRES 4 M 142 A G G U U A A A A A U A G SEQRES 5 M 142 U U U U A A U A U U G C U SEQRES 6 M 142 A U A G U C U U A G A G G SEQRES 7 M 142 U C U U G C G A A A G C U SEQRES 8 M 142 U A C C A C A C A A G A U SEQRES 9 M 142 G G A C C G G A G C G A A SEQRES 10 M 142 A G C U C C A A U A U C U SEQRES 11 M 142 A G U G U A C C C U C G CRYST1 133.570 133.570 160.425 90.00 90.00 120.00 P 63 12 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 0.007487 0.004322 0.000000 0.00000 SCALE2 0.000000 0.008645 0.000000 0.00000 SCALE3 0.000000 0.000000 0.006233 0.00000