HEADER TOXIN 20-MAR-25 9NVH TITLE NMR STRUCTURE OF CONOTOXIN K-SRXIA COMPND MOL_ID: 1; COMPND 2 MOLECULE: KAPPA-CONOTOXIN SRXIA; COMPND 3 CHAIN: A; COMPND 4 SYNONYM: KAPPA-SRXIA,I2-SUPERFAMILY CONOTOXIN SR11A; COMPND 5 ENGINEERED: YES SOURCE MOL_ID: 1; SOURCE 2 ORGANISM_SCIENTIFIC: CONUS SPURIUS; SOURCE 3 ORGANISM_COMMON: ALPHABET CONE; SOURCE 4 ORGANISM_TAXID: 192919; SOURCE 5 EXPRESSION_SYSTEM: ESCHERICHIA COLI BL21(DE3); SOURCE 6 EXPRESSION_SYSTEM_TAXID: 469008; SOURCE 7 EXPRESSION_SYSTEM_VARIANT: C41 KEYWDS CONOTOXIN, ION CHANNEL, POTASSIUM, TOXIN EXPDTA SOLUTION NMR NUMMDL 20 AUTHOR C.M.MELCHOR-MENESES,F.DEL RIO-PORTILLA REVDAT 2 21-MAY-25 9NVH 1 JRNL REVDAT 1 14-MAY-25 9NVH 0 JRNL AUTH L.I.ESCOBAR,C.D.QUEZADA SUASTE,C.SALVADOR,D.L.APARICIO, JRNL AUTH 2 C.M.MELCHOR-MENESES,J.BRAVO-MARTINEZ,V.DE LA ROSA, JRNL AUTH 3 Z.LOPEZ-GONZALEZ,F.DEL RIO-PORTILLA JRNL TITL BLOCK OF KV1 POTASSIUM CHANNELS AND NMR STRUCTURE OF JRNL TITL 2 RECOMBINANT CONOTOXIN KAPPA-SRXIA. JRNL REF TOXICON V. 262 08384 2025 JRNL REFN ISSN 0041-0101 JRNL PMID 40324600 JRNL DOI 10.1016/J.TOXICON.2025.108384 REMARK 2 REMARK 2 RESOLUTION. NOT APPLICABLE. REMARK 3 REMARK 3 REFINEMENT. REMARK 3 PROGRAM : AMBER REMARK 3 AUTHORS : CASE, DARDEN, CHEATHAM III, SIMMERLING, WANG, REMARK 3 DUKE, LUO, AND KOLLMAN REMARK 3 REMARK 3 OTHER REFINEMENT REMARKS: USED ALSO FOR SIMULATED ANNEALING REMARK 4 REMARK 4 9NVH COMPLIES WITH FORMAT V. 3.30, 13-JUL-11 REMARK 100 REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY RCSB ON 21-MAR-25. REMARK 100 THE DEPOSITION ID IS D_1000294342. REMARK 210 REMARK 210 EXPERIMENTAL DETAILS REMARK 210 EXPERIMENT TYPE : NMR REMARK 210 TEMPERATURE (KELVIN) : 298 REMARK 210 PH : 6.0 REMARK 210 IONIC STRENGTH : 1 REMARK 210 PRESSURE : 1 ATM REMARK 210 SAMPLE CONTENTS : 1 MM CONOTOXIN K-SRXIA, 95% REMARK 210 H2O/5% D2O REMARK 210 REMARK 210 NMR EXPERIMENTS CONDUCTED : 2D-TOCSY; 2D 1H-1H NOESY REMARK 210 SPECTROMETER FIELD STRENGTH : 700 MHZ REMARK 210 SPECTROMETER MODEL : AVANCE III HD REMARK 210 SPECTROMETER MANUFACTURER : BRUKER REMARK 210 REMARK 210 STRUCTURE DETERMINATION. REMARK 210 SOFTWARE USED : CYANA, CARA, NMRPIPE REMARK 210 METHOD USED : MOLECULAR DYNAMICS REMARK 210 REMARK 210 CONFORMERS, NUMBER CALCULATED : 200 REMARK 210 CONFORMERS, NUMBER SUBMITTED : 20 REMARK 210 CONFORMERS, SELECTION CRITERIA : STRUCTURES WITH THE LOWEST REMARK 210 ENERGY REMARK 210 REMARK 210 BEST REPRESENTATIVE CONFORMER IN THIS ENSEMBLE : 1 REMARK 210 REMARK 210 REMARK: NULL REMARK 215 REMARK 215 NMR STUDY REMARK 215 THE COORDINATES IN THIS ENTRY WERE GENERATED FROM SOLUTION REMARK 215 NMR DATA. PROTEIN DATA BANK CONVENTIONS REQUIRE THAT REMARK 215 CRYST1 AND SCALE RECORDS BE INCLUDED, BUT THE VALUES ON REMARK 215 THESE RECORDS ARE MEANINGLESS. 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 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 1 ARG A 20 NE - CZ - NH1 ANGL. DEV. = 4.0 DEGREES REMARK 500 1 ARG A 24 NE - CZ - NH1 ANGL. DEV. = 3.3 DEGREES REMARK 500 1 ARG A 32 NE - CZ - NH1 ANGL. DEV. = 3.1 DEGREES REMARK 500 1 ARG A 32 NE - CZ - NH2 ANGL. DEV. = -3.0 DEGREES REMARK 500 2 ARG A 5 NE - CZ - NH1 ANGL. DEV. = 3.1 DEGREES REMARK 500 3 ARG A 24 NE - CZ - NH1 ANGL. DEV. = 3.6 DEGREES REMARK 500 3 ARG A 32 NE - CZ - NH1 ANGL. DEV. = 3.7 DEGREES REMARK 500 4 ARG A 24 NE - CZ - NH1 ANGL. DEV. = 3.6 DEGREES REMARK 500 4 ARG A 32 NE - CZ - NH1 ANGL. DEV. = 3.1 DEGREES REMARK 500 5 ARG A 20 NE - CZ - NH1 ANGL. DEV. = 3.6 DEGREES REMARK 500 5 ARG A 24 NE - CZ - NH1 ANGL. DEV. = 4.4 DEGREES REMARK 500 5 ARG A 32 NE - CZ - NH1 ANGL. DEV. = 3.8 DEGREES REMARK 500 6 ARG A 5 NE - CZ - NH1 ANGL. DEV. = 4.1 DEGREES REMARK 500 6 ARG A 24 NE - CZ - NH1 ANGL. DEV. = 3.1 DEGREES REMARK 500 6 ARG A 32 NE - CZ - NH1 ANGL. DEV. = 3.5 DEGREES REMARK 500 7 ARG A 5 NE - CZ - NH1 ANGL. DEV. = 3.5 DEGREES REMARK 500 8 ARG A 20 NE - CZ - NH1 ANGL. DEV. = 3.4 DEGREES REMARK 500 8 ARG A 32 NE - CZ - NH1 ANGL. DEV. = 4.1 DEGREES REMARK 500 9 ARG A 5 NE - CZ - NH1 ANGL. DEV. = 3.8 DEGREES REMARK 500 9 ARG A 32 NE - CZ - NH1 ANGL. DEV. = 3.5 DEGREES REMARK 500 10 ARG A 32 NE - CZ - NH1 ANGL. DEV. = 3.3 DEGREES REMARK 500 11 ARG A 20 NE - CZ - NH1 ANGL. DEV. = 3.9 DEGREES REMARK 500 11 ARG A 24 NE - CZ - NH1 ANGL. DEV. = 3.6 DEGREES REMARK 500 12 ARG A 20 NE - CZ - NH1 ANGL. DEV. = 3.1 DEGREES REMARK 500 12 ARG A 32 NE - CZ - NH1 ANGL. DEV. = 3.2 DEGREES REMARK 500 13 ARG A 20 NE - CZ - NH1 ANGL. DEV. = 3.8 DEGREES REMARK 500 14 ARG A 24 NE - CZ - NH1 ANGL. DEV. = 3.9 DEGREES REMARK 500 14 ARG A 32 NE - CZ - NH1 ANGL. DEV. = 3.1 DEGREES REMARK 500 15 ARG A 20 NE - CZ - NH1 ANGL. DEV. = 3.4 DEGREES REMARK 500 15 ARG A 24 NE - CZ - NH1 ANGL. DEV. = 3.2 DEGREES REMARK 500 15 ARG A 32 NE - CZ - NH1 ANGL. DEV. = 4.5 DEGREES REMARK 500 16 ARG A 5 NE - CZ - NH1 ANGL. DEV. = 3.4 DEGREES REMARK 500 17 ARG A 5 NE - CZ - NH1 ANGL. DEV. = 3.9 DEGREES REMARK 500 17 ARG A 20 NE - CZ - NH1 ANGL. DEV. = 3.1 DEGREES REMARK 500 18 ARG A 20 NE - CZ - NH1 ANGL. DEV. = 3.5 DEGREES REMARK 500 19 ARG A 5 NE - CZ - NH1 ANGL. DEV. = 3.1 DEGREES REMARK 500 19 ARG A 20 NE - CZ - NH1 ANGL. DEV. = 3.5 DEGREES REMARK 500 20 ARG A 20 NE - CZ - NH1 ANGL. DEV. = 4.2 DEGREES REMARK 500 20 ARG A 24 NE - CZ - NH1 ANGL. DEV. = 3.4 DEGREES REMARK 500 20 ARG A 32 NE - CZ - NH1 ANGL. DEV. = 4.4 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 1 CYS A 31 39.52 -83.41 REMARK 500 3 GLU A 13 179.09 179.15 REMARK 500 3 CYS A 31 36.94 -155.45 REMARK 500 3 ARG A 32 38.57 -88.26 REMARK 500 4 ARG A 24 49.15 -105.24 REMARK 500 4 GLU A 28 -152.62 -139.03 REMARK 500 4 ALA A 29 -44.92 -139.64 REMARK 500 5 CYS A 31 43.50 -73.65 REMARK 500 6 CYS A 31 34.72 -81.30 REMARK 500 7 ARG A 24 21.21 -140.53 REMARK 500 8 ARG A 32 49.29 -79.88 REMARK 500 9 ASN A 14 -38.44 -38.45 REMARK 500 11 GLU A 12 -10.46 -141.58 REMARK 500 15 ARG A 32 35.49 -74.39 REMARK 500 18 CYS A 22 135.56 -37.97 REMARK 500 18 ARG A 32 45.33 -85.25 REMARK 500 19 ARG A 32 25.38 -70.24 REMARK 500 20 ARG A 24 43.63 -143.24 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 16 ARG A 20 0.08 SIDE CHAIN REMARK 500 REMARK 500 REMARK: NULL REMARK 900 REMARK 900 RELATED ENTRIES REMARK 900 RELATED ID: 31235 RELATED DB: BMRB REMARK 900 NMR STRUCTURE OF CONOTOXIN K-SRXIA DBREF 9NVH A 4 35 UNP P0C615 I2BA_CONSP 1 32 SEQADV 9NVH GLY A 1 UNP P0C615 EXPRESSION TAG SEQADV 9NVH GLY A 2 UNP P0C615 EXPRESSION TAG SEQADV 9NVH SER A 3 UNP P0C615 EXPRESSION TAG SEQRES 1 A 35 GLY GLY SER CYS ARG THR GLU GLY MET SER CYS GLU GLU SEQRES 2 A 35 ASN GLN GLN CYS CYS TRP ARG SER CYS CYS ARG GLY GLU SEQRES 3 A 35 CYS GLU ALA PRO CYS ARG PHE GLY PRO SSBOND 1 CYS A 4 CYS A 18 1555 1555 2.03 SSBOND 2 CYS A 11 CYS A 23 1555 1555 2.02 SSBOND 3 CYS A 17 CYS A 27 1555 1555 2.04 SSBOND 4 CYS A 22 CYS A 31 1555 1555 2.03 CRYST1 1.000 1.000 1.000 90.00 90.00 90.00 P 1 1 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 0.018263 0.006457 0.011182 0.00000 SCALE2 0.000000 0.019371 0.011182 0.00000 SCALE3 0.000000 0.000000 0.022367 0.00000 MODEL 1 TER 484 PRO A 35 ENDMDL MODEL 2 TER 484 PRO A 35 ENDMDL MODEL 3 TER 484 PRO A 35 ENDMDL MODEL 4 TER 484 PRO A 35 ENDMDL MODEL 5 TER 484 PRO A 35 ENDMDL MODEL 6 TER 484 PRO A 35 ENDMDL MODEL 7 TER 484 PRO A 35 ENDMDL MODEL 8 TER 484 PRO A 35 ENDMDL MODEL 9 TER 484 PRO A 35 ENDMDL MODEL 10 TER 484 PRO A 35 ENDMDL MODEL 11 TER 484 PRO A 35 ENDMDL MODEL 12 TER 484 PRO A 35 ENDMDL MODEL 13 TER 484 PRO A 35 ENDMDL MODEL 14 TER 484 PRO A 35 ENDMDL MODEL 15 TER 484 PRO A 35 ENDMDL MODEL 16 TER 484 PRO A 35 ENDMDL MODEL 17 TER 484 PRO A 35 ENDMDL MODEL 18 TER 484 PRO A 35 ENDMDL MODEL 19 TER 484 PRO A 35 ENDMDL MODEL 20 TER 484 PRO A 35 ENDMDL CONECT 33 229 CONECT 131 308 CONECT 219 364 CONECT 229 33 CONECT 298 413 CONECT 308 131 CONECT 364 219 CONECT 413 298 MASTER 181 0 0 0 0 0 0 6 261 1 8 3 END