2Z7E - Header Asymmetric Unit

HEADER BIOSYNTHETIC PROTEIN 20-AUG-07 2Z7E

TITLE CRYSTAL STRUCTURE OF AQUIFEX AEOLICUS ISCU WITH BOUND [2FE- TITLE 2 2S] CLUSTER

COMPND MOL_ID: 1; COMPND 2 MOLECULE: NIFU-LIKE PROTEIN; COMPND 3 CHAIN: A, B, C; COMPND 4 SYNONYM: ISCU PROTEIN; COMPND 5 ENGINEERED: YES; COMPND 6 MUTATION: YES

SOURCE MOL_ID: 1; SOURCE 2 ORGANISM_SCIENTIFIC: AQUIFEX AEOLICUS; SOURCE 3 ORGANISM_TAXID: 63363; SOURCE 4 STRAIN: VF5; SOURCE 5 GENE: AQ_896; SOURCE 6 EXPRESSION_SYSTEM: ESCHERICHIA COLI; SOURCE 7 EXPRESSION_SYSTEM_TAXID: 562; SOURCE 8 EXPRESSION_SYSTEM_STRAIN: C41(DE3); SOURCE 9 EXPRESSION_SYSTEM_VECTOR_TYPE: PLASMID; SOURCE 10 EXPRESSION_SYSTEM_PLASMID: PET21A(+)

KEYWDS IRON-SULFUR CLUSTER, IRON, BIOSYNTHESIS, [2FE-2S], ISC, KEYWDS 2 ISCU, NIFU, ASYMMETRIC TRIMER, THREE CONSERVED CYS, KEYWDS 3 BIOSYNTHETIC PROTEIN

EXPDTA X-RAY DIFFRACTION

AUTHOR Y.SHIMOMURA,K.WADA,Y.TAKAHASHI,K.FUKUYAMA

REVDAT 3 24-FEB-09 2Z7E 1 VERSN REVDAT 2 07-OCT-08 2Z7E 1 JRNL REVDAT 1 19-AUG-08 2Z7E 0

JRNL AUTH Y.SHIMOMURA,K.WADA,K.FUKUYAMA,Y.TAKAHASHI JRNL TITL THE ASYMMETRIC TRIMERIC ARCHITECTURE OF [2FE-2S] JRNL TITL 2 ISCU: IMPLICATIONS FOR ITS SCAFFOLDING DURING JRNL TITL 3 IRON-SULFUR CLUSTER BIOSYNTHESIS JRNL REF J.MOL.BIOL. V. 383 133 2008 JRNL REFN ISSN 0022-2836 JRNL PMID 18723024 JRNL DOI 10.1016/J.JMB.2008.08.015

REMARK 1

REMARK 2 REMARK 2 RESOLUTION. 2.30 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) : 2.30 REMARK 3 RESOLUTION RANGE LOW (ANGSTROMS) : 47.25 REMARK 3 DATA CUTOFF (SIGMA(F)) : 0.000 REMARK 3 DATA CUTOFF HIGH (ABS(F)) : 1635058.450 REMARK 3 DATA CUTOFF LOW (ABS(F)) : 0.0000 REMARK 3 COMPLETENESS (WORKING+TEST) (%) : 96.5 REMARK 3 NUMBER OF REFLECTIONS : 24440 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) : 0.225 REMARK 3 FREE R VALUE : 0.252 REMARK 3 FREE R VALUE TEST SET SIZE (%) : 5.000 REMARK 3 FREE R VALUE TEST SET COUNT : 1226 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 : 6 REMARK 3 BIN RESOLUTION RANGE HIGH (A) : 2.30 REMARK 3 BIN RESOLUTION RANGE LOW (A) : 2.44 REMARK 3 BIN COMPLETENESS (WORKING+TEST) (%) : 81.30 REMARK 3 REFLECTIONS IN BIN (WORKING SET) : 3189 REMARK 3 BIN R VALUE (WORKING SET) : 0.2770 REMARK 3 BIN FREE R VALUE : 0.2970 REMARK 3 BIN FREE R VALUE TEST SET SIZE (%) : 5.40 REMARK 3 BIN FREE R VALUE TEST SET COUNT : 181 REMARK 3 ESTIMATED ERROR OF BIN FREE R VALUE : 0.022 REMARK 3 REMARK 3 NUMBER OF NON-HYDROGEN ATOMS USED IN REFINEMENT. REMARK 3 PROTEIN ATOMS : 3087 REMARK 3 NUCLEIC ACID ATOMS : 0 REMARK 3 HETEROGEN ATOMS : 24 REMARK 3 SOLVENT ATOMS : 162 REMARK 3 REMARK 3 B VALUES. REMARK 3 FROM WILSON PLOT (A**2) : 28.00 REMARK 3 MEAN B VALUE (OVERALL, A**2) : 49.90 REMARK 3 OVERALL ANISOTROPIC B VALUE. REMARK 3 B11 (A**2) : -5.37000 REMARK 3 B22 (A**2) : -12.50000 REMARK 3 B33 (A**2) : 17.86000 REMARK 3 B12 (A**2) : 0.00000 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) : 0.31 REMARK 3 ESD FROM SIGMAA (A) : 0.27 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) : 0.35 REMARK 3 ESD FROM C-V SIGMAA (A) : 0.34 REMARK 3 REMARK 3 RMS DEVIATIONS FROM IDEAL VALUES. REMARK 3 BOND LENGTHS (A) : 0.007 REMARK 3 BOND ANGLES (DEGREES) : 1.30 REMARK 3 DIHEDRAL ANGLES (DEGREES) : 22.60 REMARK 3 IMPROPER ANGLES (DEGREES) : 0.84 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) : 1.430 ; 1.500 REMARK 3 MAIN-CHAIN ANGLE (A**2) : 2.460 ; 2.000 REMARK 3 SIDE-CHAIN BOND (A**2) : 2.050 ; 2.000 REMARK 3 SIDE-CHAIN ANGLE (A**2) : 3.010 ; 2.500 REMARK 3 REMARK 3 BULK SOLVENT MODELING. REMARK 3 METHOD USED : FLAT MODEL REMARK 3 KSOL : 0.39 REMARK 3 BSOL : 74.56 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 : WATER_REP.PARAM REMARK 3 PARAMETER FILE 3 : FES_XPLOR_PARAM.TXT REMARK 3 PARAMETER FILE 4 : SO4_XPLOR_PARAM.TXT REMARK 3 PARAMETER FILE 5 : NULL REMARK 3 TOPOLOGY FILE 1 : PROTEIN.TOP REMARK 3 TOPOLOGY FILE 2 : WATER_REP.TOP REMARK 3 TOPOLOGY FILE 3 : FES_XPLOR_TOP.TXT REMARK 3 TOPOLOGY FILE 4 : SO4_XPLOR_TOP.TXT REMARK 3 TOPOLOGY FILE 5 : NULL REMARK 3 REMARK 3 OTHER REFINEMENT REMARKS: NULL

REMARK 4 REMARK 4 2Z7E COMPLIES WITH FORMAT V. 3.15, 01-DEC-08

REMARK 100 REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY PDBJ ON 21-AUG-07. REMARK 100 THE RCSB ID CODE IS RCSB027614.

REMARK 200 REMARK 200 EXPERIMENTAL DETAILS REMARK 200 EXPERIMENT TYPE : X-RAY DIFFRACTION REMARK 200 DATE OF DATA COLLECTION : 26-MAR-06 REMARK 200 TEMPERATURE (KELVIN) : 100 REMARK 200 PH : NULL REMARK 200 NUMBER OF CRYSTALS USED : 1 REMARK 200 REMARK 200 SYNCHROTRON (Y/N) : Y REMARK 200 RADIATION SOURCE : SPRING-8 REMARK 200 BEAMLINE : BL41XU REMARK 200 X-RAY GENERATOR MODEL : NULL REMARK 200 MONOCHROMATIC OR LAUE (M/L) : M REMARK 200 WAVELENGTH OR RANGE (A) : 1.7407, 1.7423, 1.6947, 1.5000 REMARK 200 MONOCHROMATOR : NULL REMARK 200 OPTICS : NULL REMARK 200 REMARK 200 DETECTOR TYPE : CCD REMARK 200 DETECTOR MANUFACTURER : ADSC QUANTUM 315 REMARK 200 INTENSITY-INTEGRATION SOFTWARE : HKL-2000 REMARK 200 DATA SCALING SOFTWARE : HKL-2000 REMARK 200 REMARK 200 NUMBER OF UNIQUE REFLECTIONS : 24440 REMARK 200 RESOLUTION RANGE HIGH (A) : 2.300 REMARK 200 RESOLUTION RANGE LOW (A) : 47.250 REMARK 200 REJECTION CRITERIA (SIGMA(I)) : NULL REMARK 200 REMARK 200 OVERALL. REMARK 200 COMPLETENESS FOR RANGE (%) : 96.5 REMARK 200 DATA REDUNDANCY : NULL REMARK 200 R MERGE (I) : NULL REMARK 200 R SYM (I) : NULL REMARK 200 <I/SIGMA(I)> 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 <I/SIGMA(I)> FOR SHELL : NULL REMARK 200 REMARK 200 DIFFRACTION PROTOCOL: MAD REMARK 200 METHOD USED TO DETERMINE THE STRUCTURE: MAD REMARK 200 SOFTWARE USED: CNS REMARK 200 STARTING MODEL: NULL REMARK 200 REMARK 200 REMARK: NULL

REMARK 280 REMARK 280 CRYSTAL REMARK 280 SOLVENT CONTENT, VS (%): 53.24 REMARK 280 MATTHEWS COEFFICIENT, VM (ANGSTROMS**3/DA): 2.63 REMARK 280 REMARK 280 CRYSTALLIZATION CONDITIONS: 1.6M AMMONIUM SULFATE, 0.5M LITHIUM REMARK 280 CHLORIDE, VAPOR DIFFUSION, HANGING DROP, TEMPERATURE 293K

REMARK 290 REMARK 290 CRYSTALLOGRAPHIC SYMMETRY REMARK 290 SYMMETRY OPERATORS FOR SPACE GROUP: P 21 21 2 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 36.45150 REMARK 290 SMTRY2 3 0.000000 1.000000 0.000000 61.06800 REMARK 290 SMTRY3 3 0.000000 0.000000 -1.000000 0.00000 REMARK 290 SMTRY1 4 1.000000 0.000000 0.000000 36.45150 REMARK 290 SMTRY2 4 0.000000 -1.000000 0.000000 61.06800 REMARK 290 SMTRY3 4 0.000000 0.000000 -1.000000 0.00000 REMARK 290 REMARK 290 REMARK: NULL

REMARK 300 REMARK 300 BIOMOLECULE: 1, 2 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 IS A TRIMER WHICH CONSISTS OF REMARK 300 THE THREE PROTOMERS IN THE 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: TRIMERIC REMARK 350 SOFTWARE DETERMINED QUATERNARY STRUCTURE: TRIMERIC REMARK 350 SOFTWARE USED: PISA REMARK 350 TOTAL BURIED SURFACE AREA: 4800 ANGSTROM**2 REMARK 350 SURFACE AREA OF THE COMPLEX: 17750 ANGSTROM**2 REMARK 350 CHANGE IN SOLVENT FREE ENERGY: -104.0 KCAL/MOL REMARK 350 APPLY THE FOLLOWING TO CHAINS: A, B, C 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 350 REMARK 350 BIOMOLECULE: 2 REMARK 350 SOFTWARE DETERMINED QUATERNARY STRUCTURE: HEXAMERIC REMARK 350 SOFTWARE USED: PISA REMARK 350 TOTAL BURIED SURFACE AREA: 13550 ANGSTROM**2 REMARK 350 SURFACE AREA OF THE COMPLEX: 31560 ANGSTROM**2 REMARK 350 CHANGE IN SOLVENT FREE ENERGY: -252.0 KCAL/MOL REMARK 350 APPLY THE FOLLOWING TO CHAINS: A, B, C 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 350 BIOMT1 2 -1.000000 0.000000 0.000000 72.90300 REMARK 350 BIOMT2 2 0.000000 -1.000000 0.000000 122.13600 REMARK 350 BIOMT3 2 0.000000 0.000000 1.000000 0.00000

REMARK 375 REMARK 375 SPECIAL POSITION REMARK 375 THE FOLLOWING ATOMS ARE FOUND TO BE WITHIN 0.15 ANGSTROMS REMARK 375 OF A SYMMETRY RELATED ATOM AND ARE ASSUMED TO BE ON SPECIAL REMARK 375 POSITIONS. REMARK 375 REMARK 375 ATOM RES CSSEQI REMARK 375 S SO4 A 160 LIES ON A SPECIAL POSITION.

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 GLU A 140 REMARK 465 GLU A 141 REMARK 465 GLU A 142 REMARK 465 GLU A 143 REMARK 465 GLU A 144 REMARK 465 GLN A 145 REMARK 465 GLU A 146 REMARK 465 GLU A 147 REMARK 465 SER A 148 REMARK 465 LYS A 149 REMARK 465 GLU A 150 REMARK 465 PHE A 151 REMARK 465 GLU A 152 REMARK 465 PHE A 153 REMARK 465 LEU A 154 REMARK 465 SER A 155 REMARK 465 GLY A 156 REMARK 465 THR A 157 REMARK 465 MET B 1 REMARK 465 SER B 2 REMARK 465 GLU B 143 REMARK 465 GLU B 144 REMARK 465 GLN B 145 REMARK 465 GLU B 146 REMARK 465 GLU B 147 REMARK 465 SER B 148 REMARK 465 LYS B 149 REMARK 465 GLU B 150 REMARK 465 PHE B 151 REMARK 465 GLU B 152 REMARK 465 PHE B 153 REMARK 465 LEU B 154 REMARK 465 SER B 155 REMARK 465 GLY B 156 REMARK 465 THR B 157 REMARK 465 MET C 1 REMARK 465 TYR C 139 REMARK 465 GLU C 140 REMARK 465 GLU C 141 REMARK 465 GLU C 142 REMARK 465 GLU C 143 REMARK 465 GLU C 144 REMARK 465 GLN C 145 REMARK 465 GLU C 146 REMARK 465 GLU C 147 REMARK 465 SER C 148 REMARK 465 LYS C 149 REMARK 465 GLU C 150 REMARK 465 PHE C 151 REMARK 465 GLU C 152 REMARK 465 PHE C 153 REMARK 465 LEU C 154 REMARK 465 SER C 155 REMARK 465 GLY C 156 REMARK 465 THR C 157

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 SER A 2 OG REMARK 470 GLU A 4 CG CD OE1 OE2 REMARK 470 LYS A 91 CG CD CE NZ REMARK 470 GLN A 103 CG CD OE1 NE2 REMARK 470 GLU A 130 CG CD OE1 OE2 REMARK 470 LYS A 134 CG CD CE NZ REMARK 470 ASP A 137 CG OD1 OD2 REMARK 470 TYR A 139 CG CD1 CD2 CE1 CE2 CZ OH REMARK 470 LYS B 8 CG CD CE NZ REMARK 470 VAL B 9 CG1 CG2 REMARK 470 GLU B 54 CG CD OE1 OE2 REMARK 470 TYR B 139 CG CD1 CD2 CE1 CE2 CZ OH REMARK 470 GLU B 140 CG CD OE1 OE2 REMARK 470 GLU B 141 CG CD OE1 OE2 REMARK 470 GLU B 142 CG CD OE1 OE2 REMARK 470 SER C 2 OG REMARK 470 ARG C 17 CG CD NE CZ NH1 NH2 REMARK 470 ASP C 24 CG OD1 OD2 REMARK 470 GLN C 30 CG CD OE1 NE2 REMARK 470 ASN C 33 CG OD1 ND2 REMARK 470 LYS C 45 CG CD CE NZ REMARK 470 GLU C 54 CG CD OE1 OE2 REMARK 470 PHE C 61 CG CD1 CD2 CE1 CE2 CZ REMARK 470 LYS C 91 CG CD CE NZ REMARK 470 ILE C 105 CG1 CG2 CD1 REMARK 470 HIS C 106 CG ND1 CD2 CE1 NE2 REMARK 470 THR C 108 OG1 CG2 REMARK 470 ASN C 109 CG OD1 ND2 REMARK 470 LEU C 110 CG CD1 CD2 REMARK 470 GLU C 113 CG CD OE1 OE2 REMARK 470 LYS C 134 CG CD CE NZ

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 CYS A 63 107.17 -18.00 REMARK 500 LEU A 110 21.12 -149.79 REMARK 500 TYR B 5 90.01 -62.96 REMARK 500 ASN B 50 14.92 -144.70 REMARK 500 PRO B 102 -7.46 -58.96 REMARK 500 LYS B 104 32.45 -85.84 REMARK 500 CYS B 138 104.95 -51.16 REMARK 500 GLU B 140 -142.23 -66.19 REMARK 500 GLU B 141 -21.54 89.12 REMARK 500 ASN C 50 -1.12 -150.72 REMARK 500 LYS C 104 -75.40 -93.88 REMARK 500 ASN C 109 103.87 51.37 REMARK 500 LEU C 110 -108.27 -59.87 REMARK 500 GLN C 126 -138.73 -81.43 REMARK 500 PRO C 136 -171.82 -52.79 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 B 205 DISTANCE = 6.33 ANGSTROMS

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 FES B 158 FE1 REMARK 620 N RES CSSEQI ATOM REMARK 620 1 CYS B 36 SG REMARK 620 2 HIS B 106 NE2 113.1 REMARK 620 N 1 REMARK 620 REMARK 620 COORDINATION ANGLES FOR: M RES CSSEQI METAL REMARK 620 FES B 158 FE2 REMARK 620 N RES CSSEQI ATOM REMARK 620 1 CYS B 63 SG REMARK 620 2 CYS B 107 SG 109.2 REMARK 620 N 1

REMARK 800 REMARK 800 SITE REMARK 800 SITE_IDENTIFIER: AC1 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE SO4 A 158 REMARK 800 SITE_IDENTIFIER: AC2 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE SO4 A 159 REMARK 800 SITE_IDENTIFIER: AC3 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE SO4 A 160 REMARK 800 SITE_IDENTIFIER: AC4 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE SO4 C 158 REMARK 800 SITE_IDENTIFIER: AC5 REMARK 800 EVIDENCE_CODE: SOFTWARE REMARK 800 SITE_DESCRIPTION: BINDING SITE FOR RESIDUE FES B 158

DBREF 2Z7E A 1 157 UNP O67045 NIFU_AQUAE 1 157 DBREF 2Z7E B 1 157 UNP O67045 NIFU_AQUAE 1 157 DBREF 2Z7E C 1 157 UNP O67045 NIFU_AQUAE 1 157

SEQADV 2Z7E ALA A 38 UNP O67045 ASP 38 ENGINEERED SEQADV 2Z7E ALA B 38 UNP O67045 ASP 38 ENGINEERED SEQADV 2Z7E ALA C 38 UNP O67045 ASP 38 ENGINEERED

SEQRES 1 A 157 MET SER PHE GLU TYR ASN GLU LYS VAL LEU ASP HIS PHE SEQRES 2 A 157 LEU ASN PRO ARG ASN VAL GLY VAL LEU GLU ASP ALA ASN SEQRES 3 A 157 GLY VAL GLY GLN CYS GLY ASN PRO ALA CYS GLY ALA ALA SEQRES 4 A 157 MET LEU PHE THR ILE LYS VAL ASN PRO GLU ASN ASP VAL SEQRES 5 A 157 ILE GLU ASP VAL ARG PHE LYS THR PHE GLY CYS GLY SER SEQRES 6 A 157 ALA ILE ALA VAL SER SER MET LEU THR GLU MET VAL LYS SEQRES 7 A 157 GLY LYS PRO ILE GLN TYR ALA LEU ASN LEU THR TYR LYS SEQRES 8 A 157 ASP ILE PHE GLU GLU LEU GLY GLY LEU PRO PRO GLN LYS SEQRES 9 A 157 ILE HIS CYS THR ASN LEU GLY LEU GLU THR LEU HIS VAL SEQRES 10 A 157 ALA ILE LYS ASP TYR LEU MET LYS GLN GLY ARG VAL GLU SEQRES 11 A 157 GLU ALA SER LYS ILE PRO ASP CYS TYR GLU GLU GLU GLU SEQRES 12 A 157 GLU GLN GLU GLU SER LYS GLU PHE GLU PHE LEU SER GLY SEQRES 13 A 157 THR SEQRES 1 B 157 MET SER PHE GLU TYR ASN GLU LYS VAL LEU ASP HIS PHE SEQRES 2 B 157 LEU ASN PRO ARG ASN VAL GLY VAL LEU GLU ASP ALA ASN SEQRES 3 B 157 GLY VAL GLY GLN CYS GLY ASN PRO ALA CYS GLY ALA ALA SEQRES 4 B 157 MET LEU PHE THR ILE LYS VAL ASN PRO GLU ASN ASP VAL SEQRES 5 B 157 ILE GLU ASP VAL ARG PHE LYS THR PHE GLY CYS GLY SER SEQRES 6 B 157 ALA ILE ALA VAL SER SER MET LEU THR GLU MET VAL LYS SEQRES 7 B 157 GLY LYS PRO ILE GLN TYR ALA LEU ASN LEU THR TYR LYS SEQRES 8 B 157 ASP ILE PHE GLU GLU LEU GLY GLY LEU PRO PRO GLN LYS SEQRES 9 B 157 ILE HIS CYS THR ASN LEU GLY LEU GLU THR LEU HIS VAL SEQRES 10 B 157 ALA ILE LYS ASP TYR LEU MET LYS GLN GLY ARG VAL GLU SEQRES 11 B 157 GLU ALA SER LYS ILE PRO ASP CYS TYR GLU GLU GLU GLU SEQRES 12 B 157 GLU GLN GLU GLU SER LYS GLU PHE GLU PHE LEU SER GLY SEQRES 13 B 157 THR SEQRES 1 C 157 MET SER PHE GLU TYR ASN GLU LYS VAL LEU ASP HIS PHE SEQRES 2 C 157 LEU ASN PRO ARG ASN VAL GLY VAL LEU GLU ASP ALA ASN SEQRES 3 C 157 GLY VAL GLY GLN CYS GLY ASN PRO ALA CYS GLY ALA ALA SEQRES 4 C 157 MET LEU PHE THR ILE LYS VAL ASN PRO GLU ASN ASP VAL SEQRES 5 C 157 ILE GLU ASP VAL ARG PHE LYS THR PHE GLY CYS GLY SER SEQRES 6 C 157 ALA ILE ALA VAL SER SER MET LEU THR GLU MET VAL LYS SEQRES 7 C 157 GLY LYS PRO ILE GLN TYR ALA LEU ASN LEU THR TYR LYS SEQRES 8 C 157 ASP ILE PHE GLU GLU LEU GLY GLY LEU PRO PRO GLN LYS SEQRES 9 C 157 ILE HIS CYS THR ASN LEU GLY LEU GLU THR LEU HIS VAL SEQRES 10 C 157 ALA ILE LYS ASP TYR LEU MET LYS GLN GLY ARG VAL GLU SEQRES 11 C 157 GLU ALA SER LYS ILE PRO ASP CYS TYR GLU GLU GLU GLU SEQRES 12 C 157 GLU GLN GLU GLU SER LYS GLU PHE GLU PHE LEU SER GLY SEQRES 13 C 157 THR

HET SO4 A 158 5 HET SO4 A 159 5 HET SO4 A 160 5 HET FES B 158 4 HET SO4 C 158 5

HETNAM SO4 SULFATE ION HETNAM FES FE2/S2 (INORGANIC) CLUSTER

FORMUL 4 SO4 4(O4 S 2-) FORMUL 7 FES FE2 S2 FORMUL 9 HOH *162(H2 O)

HELIX 1 1 PHE A 3 ASN A 15 1 13 HELIX 2 2 SER A 65 LYS A 78 1 14 HELIX 3 3 PRO A 81 LEU A 88 1 8 HELIX 4 4 THR A 89 GLY A 98 1 10 HELIX 5 5 LEU A 110 LYS A 125 1 16 HELIX 6 6 ARG A 128 ILE A 135 1 8 HELIX 7 7 ASN B 6 ASN B 15 1 10 HELIX 8 8 CYS B 63 LYS B 78 1 16 HELIX 9 9 PRO B 81 LEU B 88 1 8 HELIX 10 10 THR B 89 LEU B 97 1 9 HELIX 11 11 PRO B 101 GLN B 103 5 3 HELIX 12 12 LYS B 104 GLN B 126 1 23 HELIX 13 13 ARG B 128 LYS B 134 1 7 HELIX 14 14 ASN C 6 ASN C 15 1 10 HELIX 15 15 ASN C 33 GLY C 37 5 5 HELIX 16 16 GLY C 64 LYS C 78 1 15 HELIX 17 17 PRO C 81 ASN C 87 1 7 HELIX 18 18 THR C 89 GLY C 98 1 10 HELIX 19 19 GLY C 111 GLN C 126 1 16 HELIX 20 20 ARG C 128 LYS C 134 1 7

SHEET 1 A 3 GLY A 27 ASN A 33 0 SHEET 2 A 3 ALA A 38 VAL A 46 -1 O ALA A 38 N ASN A 33 SHEET 3 A 3 ILE A 53 PHE A 61 -1 O ARG A 57 N THR A 43 SHEET 1 B 3 GLY B 27 ASN B 33 0 SHEET 2 B 3 ALA B 38 VAL B 46 -1 O PHE B 42 N GLY B 29 SHEET 3 B 3 ILE B 53 THR B 60 -1 O ARG B 57 N THR B 43 SHEET 1 C 3 GLY C 27 CYS C 31 0 SHEET 2 C 3 ALA C 39 VAL C 46 -1 O PHE C 42 N GLY C 29 SHEET 3 C 3 ILE C 53 PHE C 61 -1 O PHE C 61 N ALA C 39

SSBOND 1 CYS A 31 CYS A 138 1555 1555 2.04 SSBOND 2 CYS A 36 CYS A 107 1555 1555 2.04 SSBOND 3 CYS B 31 CYS B 138 1555 1555 2.03 SSBOND 4 CYS C 31 CYS C 138 1555 1555 2.04 SSBOND 5 CYS C 63 CYS C 107 1555 1555 2.03

LINK SG CYS B 36 FE1 FES B 158 1555 1555 2.23 LINK SG CYS B 63 FE2 FES B 158 1555 1555 2.34 LINK NE2 HIS B 106 FE1 FES B 158 1555 1555 2.33 LINK SG CYS B 107 FE2 FES B 158 1555 1555 2.28

SITE 1 AC1 6 ILE A 105 HIS A 106 CYS A 107 HOH A 208 SITE 2 AC1 6 HOH A 225 HOH C 179 SITE 1 AC2 8 VAL A 21 LEU A 22 GLU A 23 ARG A 57 SITE 2 AC2 8 HOH A 205 HOH A 211 HOH B 198 HOH B 207 SITE 1 AC3 4 ASN A 18 HOH A 166 HOH A 190 HOH A 191 SITE 1 AC4 6 SER B 65 LYS B 104 TYR C 5 ASN C 6 SITE 2 AC4 6 GLY C 99 LEU C 100 SITE 1 AC5 4 CYS B 36 CYS B 63 HIS B 106 CYS B 107

CRYST1 72.903 122.136 62.051 90.00 90.00 90.00 P 21 21 2 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 0.013717 0.000000 0.000000 0.00000

SCALE2 0.000000 0.008188 0.000000 0.00000

SCALE3 0.000000 0.000000 0.016116 0.00000