HEADER MEMBRANE PROTEIN 27-FEB-23 8IJQ TITLE THE CRYO-EM STRUCTURE OF HUMAN SPHINGOMYELIN SYNTHASE-RELATED PROTEIN TITLE 2 IN COMPLEX WITH CERAMIDE COMPND MOL_ID: 1; COMPND 2 MOLECULE: SPHINGOMYELIN SYNTHASE-RELATED PROTEIN 1; COMPND 3 CHAIN: A, B, C, D, E, F; COMPND 4 SYNONYM: SMSR,CERAMIDE PHOSPHOETHANOLAMINE SYNTHASE,CPE SYNTHASE, COMPND 5 STERILE ALPHA MOTIF DOMAIN-CONTAINING PROTEIN 8,SAM DOMAIN-CONTAINING COMPND 6 PROTEIN 8; COMPND 7 EC: 2.7.8.27; COMPND 8 ENGINEERED: YES SOURCE MOL_ID: 1; SOURCE 2 ORGANISM_SCIENTIFIC: HOMO SAPIENS; SOURCE 3 ORGANISM_COMMON: HUMAN; SOURCE 4 ORGANISM_TAXID: 9606; SOURCE 5 GENE: SAMD8; SOURCE 6 EXPRESSION_SYSTEM: HOMO SAPIENS; SOURCE 7 EXPRESSION_SYSTEM_TAXID: 9606 KEYWDS SYNTHASE, SPHINGOMYELIN, CPE, MEMBRANE PROTEIN, LIPID METABOLISM EXPDTA ELECTRON MICROSCOPY AUTHOR K.HU,Q.ZHANG,Y.CHEN,D.YAO,L.ZHOU,Y.CAO REVDAT 2 06-MAR-24 8IJQ 1 JRNL REVDAT 1 28-FEB-24 8IJQ 0 JRNL AUTH K.HU,Q.ZHANG,Y.CHEN,J.YANG,Y.XIA,B.RAO,S.LI,Y.SHEN,M.CAO, JRNL AUTH 2 H.LU,A.QIN,X.C.JIANG,D.YAO,J.ZHAO,L.ZHOU,Y.CAO JRNL TITL CRYO-EM STRUCTURE OF HUMAN SPHINGOMYELIN SYNTHASE AND ITS JRNL TITL 2 MECHANISTIC IMPLICATIONS FOR SPHINGOMYELIN SYNTHESIS. JRNL REF NAT.STRUCT.MOL.BIOL. 2024 JRNL REFN ESSN 1545-9985 JRNL PMID 38388831 JRNL DOI 10.1038/S41594-024-01237-2 REMARK 2 REMARK 2 RESOLUTION. 3.45 ANGSTROMS. REMARK 3 REMARK 3 REFINEMENT. REMARK 3 SOFTWARE PACKAGES : NULL REMARK 3 RECONSTRUCTION SCHEMA : NULL REMARK 3 REMARK 3 EM MAP-MODEL FITTING AND REFINEMENT REMARK 3 PDB ENTRY : NULL REMARK 3 REFINEMENT SPACE : NULL REMARK 3 REFINEMENT PROTOCOL : NULL REMARK 3 REFINEMENT TARGET : NULL REMARK 3 OVERALL ANISOTROPIC B VALUE : NULL REMARK 3 REMARK 3 FITTING PROCEDURE : NULL REMARK 3 REMARK 3 EM IMAGE RECONSTRUCTION STATISTICS REMARK 3 NOMINAL PIXEL SIZE (ANGSTROMS) : NULL REMARK 3 ACTUAL PIXEL SIZE (ANGSTROMS) : NULL REMARK 3 EFFECTIVE RESOLUTION (ANGSTROMS) : 3.450 REMARK 3 NUMBER OF PARTICLES : 464274 REMARK 3 CTF CORRECTION METHOD : PHASE FLIPPING AND AMPLITUDE REMARK 3 CORRECTION REMARK 3 REMARK 3 EM RECONSTRUCTION MAGNIFICATION CALIBRATION: NULL REMARK 3 REMARK 3 OTHER DETAILS: NULL REMARK 4 REMARK 4 8IJQ COMPLIES WITH FORMAT V. 3.30, 13-JUL-11 REMARK 100 REMARK 100 THIS ENTRY HAS BEEN PROCESSED BY PDBC ON 09-MAR-23. REMARK 100 THE DEPOSITION ID IS D_1300035850. REMARK 245 REMARK 245 EXPERIMENTAL DETAILS REMARK 245 RECONSTRUCTION METHOD : SINGLE PARTICLE REMARK 245 SPECIMEN TYPE : NULL REMARK 245 REMARK 245 ELECTRON MICROSCOPE SAMPLE REMARK 245 SAMPLE TYPE : PARTICLE REMARK 245 PARTICLE TYPE : POINT REMARK 245 NAME OF SAMPLE : THE CRYO-EM STRUCTURE OF HUMAN REMARK 245 SPHINGOMYELIN SYNTHASE-RELATED REMARK 245 PROTEIN IN COMPLEX WITH CERAMIDE REMARK 245 SAMPLE CONCENTRATION (MG ML-1) : NULL REMARK 245 SAMPLE SUPPORT DETAILS : NULL REMARK 245 SAMPLE VITRIFICATION DETAILS : NULL REMARK 245 SAMPLE BUFFER : NULL REMARK 245 PH : 7.50 REMARK 245 SAMPLE DETAILS : NULL REMARK 245 REMARK 245 DATA ACQUISITION REMARK 245 DATE OF EXPERIMENT : NULL REMARK 245 NUMBER OF MICROGRAPHS-IMAGES : NULL REMARK 245 TEMPERATURE (KELVIN) : NULL REMARK 245 MICROSCOPE MODEL : FEI TITAN KRIOS REMARK 245 DETECTOR TYPE : GATAN K3 (6K X 4K) REMARK 245 MINIMUM DEFOCUS (NM) : 1000.00 REMARK 245 MAXIMUM DEFOCUS (NM) : 2600.00 REMARK 245 MINIMUM TILT ANGLE (DEGREES) : NULL REMARK 245 MAXIMUM TILT ANGLE (DEGREES) : NULL REMARK 245 NOMINAL CS : NULL REMARK 245 IMAGING MODE : BRIGHT FIELD REMARK 245 ELECTRON DOSE (ELECTRONS NM**-2) : 5000.00 REMARK 245 ILLUMINATION MODE : SPOT SCAN REMARK 245 NOMINAL MAGNIFICATION : NULL REMARK 245 CALIBRATED MAGNIFICATION : NULL REMARK 245 SOURCE : FIELD EMISSION GUN REMARK 245 ACCELERATION VOLTAGE (KV) : 300 REMARK 245 IMAGING DETAILS : NULL REMARK 247 REMARK 247 ELECTRON MICROSCOPY REMARK 247 THE COORDINATES IN THIS ENTRY WERE GENERATED FROM ELECTRON REMARK 247 MICROSCOPY DATA. PROTEIN DATA BANK CONVENTIONS REQUIRE REMARK 247 THAT CRYST1 AND SCALE RECORDS BE INCLUDED, BUT THE VALUES REMARK 247 ON THESE RECORDS ARE MEANINGLESS EXCEPT FOR THE CALCULATION REMARK 247 OF THE STRUCTURE FACTORS. 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: HEXAMERIC REMARK 350 APPLY THE FOLLOWING TO CHAINS: A, B, C, D, E, F 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: 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 OG SER C 268 OE1 GLU C 271 2.19 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 MET A 180 23.69 49.96 REMARK 500 LYS A 264 178.31 56.85 REMARK 500 ILE A 265 59.04 36.59 REMARK 500 SER A 268 -179.34 -179.89 REMARK 500 SER A 281 46.58 -88.65 REMARK 500 PHE A 298 67.48 60.40 REMARK 500 ARG A 318 49.73 -81.87 REMARK 500 MET B 180 28.60 47.45 REMARK 500 LYS B 264 179.54 56.59 REMARK 500 ILE B 265 59.70 36.82 REMARK 500 SER B 268 175.75 178.40 REMARK 500 SER B 281 47.13 -91.27 REMARK 500 PHE B 283 15.99 55.97 REMARK 500 PHE B 298 67.92 60.83 REMARK 500 ARG B 318 49.95 -82.55 REMARK 500 SER B 319 11.50 -142.69 REMARK 500 TRP B 320 41.29 -104.16 REMARK 500 PHE B 322 -32.21 -131.18 REMARK 500 ARG B 379 70.60 57.61 REMARK 500 SER B 405 31.82 -99.63 REMARK 500 LYS C 264 175.93 59.57 REMARK 500 ILE C 265 58.15 37.97 REMARK 500 SER C 268 -173.87 175.90 REMARK 500 SER C 281 46.99 -91.93 REMARK 500 PHE C 298 66.42 60.07 REMARK 500 ARG C 318 49.61 -80.91 REMARK 500 HIS D 224 58.90 -92.35 REMARK 500 LYS D 264 171.39 57.99 REMARK 500 ILE D 265 64.29 37.21 REMARK 500 SER D 268 -172.16 -173.50 REMARK 500 SER D 281 47.94 -94.28 REMARK 500 PHE D 283 14.80 56.93 REMARK 500 PHE D 298 65.30 60.60 REMARK 500 ASP E 179 -63.40 -98.64 REMARK 500 LYS E 264 175.00 59.57 REMARK 500 ILE E 265 62.45 37.34 REMARK 500 SER E 268 -168.25 -168.90 REMARK 500 SER E 281 48.20 -93.79 REMARK 500 PHE E 283 17.78 55.80 REMARK 500 TYR E 315 30.18 -97.15 REMARK 500 ARG E 318 48.76 -81.57 REMARK 500 MET E 384 49.65 38.80 REMARK 500 LYS F 264 174.77 59.47 REMARK 500 ILE F 265 61.32 37.79 REMARK 500 SER F 268 -179.21 -179.77 REMARK 500 TYR F 315 33.79 -96.24 REMARK 500 TRP F 320 37.00 -99.87 REMARK 500 MET F 384 47.91 34.04 REMARK 500 REMARK 500 REMARK: NULL REMARK 900 REMARK 900 RELATED ENTRIES REMARK 900 RELATED ID: EMD-35492 RELATED DB: EMDB REMARK 900 THE CRYO-EM STRUCTURE OF HUMAN SPHINGOMYELIN SYNTHASE-RELATED REMARK 900 PROTEIN WITH CERAMIDE DBREF 8IJQ A 144 407 UNP Q96LT4 SAMD8_HUMAN 144 407 DBREF 8IJQ B 144 407 UNP Q96LT4 SAMD8_HUMAN 144 407 DBREF 8IJQ C 144 407 UNP Q96LT4 SAMD8_HUMAN 144 407 DBREF 8IJQ D 144 407 UNP Q96LT4 SAMD8_HUMAN 144 407 DBREF 8IJQ E 144 407 UNP Q96LT4 SAMD8_HUMAN 144 407 DBREF 8IJQ F 144 407 UNP Q96LT4 SAMD8_HUMAN 144 407 SEQRES 1 A 264 ARG LEU ASP PRO GLU TYR TRP LYS THR ILE LEU SER CYS SEQRES 2 A 264 ILE TYR VAL PHE ILE VAL PHE GLY PHE THR SER PHE ILE SEQRES 3 A 264 MET VAL ILE VAL HIS GLU ARG VAL PRO ASP MET GLN THR SEQRES 4 A 264 TYR PRO PRO LEU PRO ASP ILE PHE LEU ASP SER VAL PRO SEQRES 5 A 264 ARG ILE PRO TRP ALA PHE ALA MET THR GLU VAL CYS GLY SEQRES 6 A 264 MET ILE LEU CYS TYR ILE TRP LEU LEU VAL LEU LEU LEU SEQRES 7 A 264 HIS LYS HIS ARG SER ILE LEU LEU ARG ARG LEU CYS SER SEQRES 8 A 264 LEU MET GLY THR VAL PHE LEU LEU ARG CYS PHE THR MET SEQRES 9 A 264 PHE VAL THR SER LEU SER VAL PRO GLY GLN HIS LEU GLN SEQRES 10 A 264 CYS THR GLY LYS ILE TYR GLY SER VAL TRP GLU LYS LEU SEQRES 11 A 264 HIS ARG ALA PHE ALA ILE TRP SER GLY PHE GLY MET THR SEQRES 12 A 264 LEU THR GLY VAL HIS THR CYS GLY ASP TYR MET PHE SER SEQRES 13 A 264 GLY HIS THR VAL VAL LEU THR MET LEU ASN PHE PHE VAL SEQRES 14 A 264 THR GLU TYR THR PRO ARG SER TRP ASN PHE LEU HIS THR SEQRES 15 A 264 LEU SER TRP VAL LEU ASN LEU PHE GLY ILE PHE PHE ILE SEQRES 16 A 264 LEU ALA ALA HIS GLU HIS TYR SER ILE ASP VAL PHE ILE SEQRES 17 A 264 ALA PHE TYR ILE THR THR ARG LEU PHE LEU TYR TYR HIS SEQRES 18 A 264 THR LEU ALA ASN THR ARG ALA TYR GLN GLN SER ARG ARG SEQRES 19 A 264 ALA ARG ILE TRP PHE PRO MET PHE SER PHE PHE GLU CYS SEQRES 20 A 264 ASN VAL ASN GLY THR VAL PRO ASN GLU TYR CYS TRP PRO SEQRES 21 A 264 PHE SER LYS PRO SEQRES 1 B 264 ARG LEU ASP PRO GLU TYR TRP LYS THR ILE LEU SER CYS SEQRES 2 B 264 ILE TYR VAL PHE ILE VAL PHE GLY PHE THR SER PHE ILE SEQRES 3 B 264 MET VAL ILE VAL HIS GLU ARG VAL PRO ASP MET GLN THR SEQRES 4 B 264 TYR PRO PRO LEU PRO ASP ILE PHE LEU ASP SER VAL PRO SEQRES 5 B 264 ARG ILE PRO TRP ALA PHE ALA MET THR GLU VAL CYS GLY SEQRES 6 B 264 MET ILE LEU CYS TYR ILE TRP LEU LEU VAL LEU LEU LEU SEQRES 7 B 264 HIS LYS HIS ARG SER ILE LEU LEU ARG ARG LEU CYS SER SEQRES 8 B 264 LEU MET GLY THR VAL PHE LEU LEU ARG CYS PHE THR MET SEQRES 9 B 264 PHE VAL THR SER LEU SER VAL PRO GLY GLN HIS LEU GLN SEQRES 10 B 264 CYS THR GLY LYS ILE TYR GLY SER VAL TRP GLU LYS LEU SEQRES 11 B 264 HIS ARG ALA PHE ALA ILE TRP SER GLY PHE GLY MET THR SEQRES 12 B 264 LEU THR GLY VAL HIS THR CYS GLY ASP TYR MET PHE SER SEQRES 13 B 264 GLY HIS THR VAL VAL LEU THR MET LEU ASN PHE PHE VAL SEQRES 14 B 264 THR GLU TYR THR PRO ARG SER TRP ASN PHE LEU HIS THR SEQRES 15 B 264 LEU SER TRP VAL LEU ASN LEU PHE GLY ILE PHE PHE ILE SEQRES 16 B 264 LEU ALA ALA HIS GLU HIS TYR SER ILE ASP VAL PHE ILE SEQRES 17 B 264 ALA PHE TYR ILE THR THR ARG LEU PHE LEU TYR TYR HIS SEQRES 18 B 264 THR LEU ALA ASN THR ARG ALA TYR GLN GLN SER ARG ARG SEQRES 19 B 264 ALA ARG ILE TRP PHE PRO MET PHE SER PHE PHE GLU CYS SEQRES 20 B 264 ASN VAL ASN GLY THR VAL PRO ASN GLU TYR CYS TRP PRO SEQRES 21 B 264 PHE SER LYS PRO SEQRES 1 C 264 ARG LEU ASP PRO GLU TYR TRP LYS THR ILE LEU SER CYS SEQRES 2 C 264 ILE TYR VAL PHE ILE VAL PHE GLY PHE THR SER PHE ILE SEQRES 3 C 264 MET VAL ILE VAL HIS GLU ARG VAL PRO ASP MET GLN THR SEQRES 4 C 264 TYR PRO PRO LEU PRO ASP ILE PHE LEU ASP SER VAL PRO SEQRES 5 C 264 ARG ILE PRO TRP ALA PHE ALA MET THR GLU VAL CYS GLY SEQRES 6 C 264 MET ILE LEU CYS TYR ILE TRP LEU LEU VAL LEU LEU LEU SEQRES 7 C 264 HIS LYS HIS ARG SER ILE LEU LEU ARG ARG LEU CYS SER SEQRES 8 C 264 LEU MET GLY THR VAL PHE LEU LEU ARG CYS PHE THR MET SEQRES 9 C 264 PHE VAL THR SER LEU SER VAL PRO GLY GLN HIS LEU GLN SEQRES 10 C 264 CYS THR GLY LYS ILE TYR GLY SER VAL TRP GLU LYS LEU SEQRES 11 C 264 HIS ARG ALA PHE ALA ILE TRP SER GLY PHE GLY MET THR SEQRES 12 C 264 LEU THR GLY VAL HIS THR CYS GLY ASP TYR MET PHE SER SEQRES 13 C 264 GLY HIS THR VAL VAL LEU THR MET LEU ASN PHE PHE VAL SEQRES 14 C 264 THR GLU TYR THR PRO ARG SER TRP ASN PHE LEU HIS THR SEQRES 15 C 264 LEU SER TRP VAL LEU ASN LEU PHE GLY ILE PHE PHE ILE SEQRES 16 C 264 LEU ALA ALA HIS GLU HIS TYR SER ILE ASP VAL PHE ILE SEQRES 17 C 264 ALA PHE TYR ILE THR THR ARG LEU PHE LEU TYR TYR HIS SEQRES 18 C 264 THR LEU ALA ASN THR ARG ALA TYR GLN GLN SER ARG ARG SEQRES 19 C 264 ALA ARG ILE TRP PHE PRO MET PHE SER PHE PHE GLU CYS SEQRES 20 C 264 ASN VAL ASN GLY THR VAL PRO ASN GLU TYR CYS TRP PRO SEQRES 21 C 264 PHE SER LYS PRO SEQRES 1 D 264 ARG LEU ASP PRO GLU TYR TRP LYS THR ILE LEU SER CYS SEQRES 2 D 264 ILE TYR VAL PHE ILE VAL PHE GLY PHE THR SER PHE ILE SEQRES 3 D 264 MET VAL ILE VAL HIS GLU ARG VAL PRO ASP MET GLN THR SEQRES 4 D 264 TYR PRO PRO LEU PRO ASP ILE PHE LEU ASP SER VAL PRO SEQRES 5 D 264 ARG ILE PRO TRP ALA PHE ALA MET THR GLU VAL CYS GLY SEQRES 6 D 264 MET ILE LEU CYS TYR ILE TRP LEU LEU VAL LEU LEU LEU SEQRES 7 D 264 HIS LYS HIS ARG SER ILE LEU LEU ARG ARG LEU CYS SER SEQRES 8 D 264 LEU MET GLY THR VAL PHE LEU LEU ARG CYS PHE THR MET SEQRES 9 D 264 PHE VAL THR SER LEU SER VAL PRO GLY GLN HIS LEU GLN SEQRES 10 D 264 CYS THR GLY LYS ILE TYR GLY SER VAL TRP GLU LYS LEU SEQRES 11 D 264 HIS ARG ALA PHE ALA ILE TRP SER GLY PHE GLY MET THR SEQRES 12 D 264 LEU THR GLY VAL HIS THR CYS GLY ASP TYR MET PHE SER SEQRES 13 D 264 GLY HIS THR VAL VAL LEU THR MET LEU ASN PHE PHE VAL SEQRES 14 D 264 THR GLU TYR THR PRO ARG SER TRP ASN PHE LEU HIS THR SEQRES 15 D 264 LEU SER TRP VAL LEU ASN LEU PHE GLY ILE PHE PHE ILE SEQRES 16 D 264 LEU ALA ALA HIS GLU HIS TYR SER ILE ASP VAL PHE ILE SEQRES 17 D 264 ALA PHE TYR ILE THR THR ARG LEU PHE LEU TYR TYR HIS SEQRES 18 D 264 THR LEU ALA ASN THR ARG ALA TYR GLN GLN SER ARG ARG SEQRES 19 D 264 ALA ARG ILE TRP PHE PRO MET PHE SER PHE PHE GLU CYS SEQRES 20 D 264 ASN VAL ASN GLY THR VAL PRO ASN GLU TYR CYS TRP PRO SEQRES 21 D 264 PHE SER LYS PRO SEQRES 1 E 264 ARG LEU ASP PRO GLU TYR TRP LYS THR ILE LEU SER CYS SEQRES 2 E 264 ILE TYR VAL PHE ILE VAL PHE GLY PHE THR SER PHE ILE SEQRES 3 E 264 MET VAL ILE VAL HIS GLU ARG VAL PRO ASP MET GLN THR SEQRES 4 E 264 TYR PRO PRO LEU PRO ASP ILE PHE LEU ASP SER VAL PRO SEQRES 5 E 264 ARG ILE PRO TRP ALA PHE ALA MET THR GLU VAL CYS GLY SEQRES 6 E 264 MET ILE LEU CYS TYR ILE TRP LEU LEU VAL LEU LEU LEU SEQRES 7 E 264 HIS LYS HIS ARG SER ILE LEU LEU ARG ARG LEU CYS SER SEQRES 8 E 264 LEU MET GLY THR VAL PHE LEU LEU ARG CYS PHE THR MET SEQRES 9 E 264 PHE VAL THR SER LEU SER VAL PRO GLY GLN HIS LEU GLN SEQRES 10 E 264 CYS THR GLY LYS ILE TYR GLY SER VAL TRP GLU LYS LEU SEQRES 11 E 264 HIS ARG ALA PHE ALA ILE TRP SER GLY PHE GLY MET THR SEQRES 12 E 264 LEU THR GLY VAL HIS THR CYS GLY ASP TYR MET PHE SER SEQRES 13 E 264 GLY HIS THR VAL VAL LEU THR MET LEU ASN PHE PHE VAL SEQRES 14 E 264 THR GLU TYR THR PRO ARG SER TRP ASN PHE LEU HIS THR SEQRES 15 E 264 LEU SER TRP VAL LEU ASN LEU PHE GLY ILE PHE PHE ILE SEQRES 16 E 264 LEU ALA ALA HIS GLU HIS TYR SER ILE ASP VAL PHE ILE SEQRES 17 E 264 ALA PHE TYR ILE THR THR ARG LEU PHE LEU TYR TYR HIS SEQRES 18 E 264 THR LEU ALA ASN THR ARG ALA TYR GLN GLN SER ARG ARG SEQRES 19 E 264 ALA ARG ILE TRP PHE PRO MET PHE SER PHE PHE GLU CYS SEQRES 20 E 264 ASN VAL ASN GLY THR VAL PRO ASN GLU TYR CYS TRP PRO SEQRES 21 E 264 PHE SER LYS PRO SEQRES 1 F 264 ARG LEU ASP PRO GLU TYR TRP LYS THR ILE LEU SER CYS SEQRES 2 F 264 ILE TYR VAL PHE ILE VAL PHE GLY PHE THR SER PHE ILE SEQRES 3 F 264 MET VAL ILE VAL HIS GLU ARG VAL PRO ASP MET GLN THR SEQRES 4 F 264 TYR PRO PRO LEU PRO ASP ILE PHE LEU ASP SER VAL PRO SEQRES 5 F 264 ARG ILE PRO TRP ALA PHE ALA MET THR GLU VAL CYS GLY SEQRES 6 F 264 MET ILE LEU CYS TYR ILE TRP LEU LEU VAL LEU LEU LEU SEQRES 7 F 264 HIS LYS HIS ARG SER ILE LEU LEU ARG ARG LEU CYS SER SEQRES 8 F 264 LEU MET GLY THR VAL PHE LEU LEU ARG CYS PHE THR MET SEQRES 9 F 264 PHE VAL THR SER LEU SER VAL PRO GLY GLN HIS LEU GLN SEQRES 10 F 264 CYS THR GLY LYS ILE TYR GLY SER VAL TRP GLU LYS LEU SEQRES 11 F 264 HIS ARG ALA PHE ALA ILE TRP SER GLY PHE GLY MET THR SEQRES 12 F 264 LEU THR GLY VAL HIS THR CYS GLY ASP TYR MET PHE SER SEQRES 13 F 264 GLY HIS THR VAL VAL LEU THR MET LEU ASN PHE PHE VAL SEQRES 14 F 264 THR GLU TYR THR PRO ARG SER TRP ASN PHE LEU HIS THR SEQRES 15 F 264 LEU SER TRP VAL LEU ASN LEU PHE GLY ILE PHE PHE ILE SEQRES 16 F 264 LEU ALA ALA HIS GLU HIS TYR SER ILE ASP VAL PHE ILE SEQRES 17 F 264 ALA PHE TYR ILE THR THR ARG LEU PHE LEU TYR TYR HIS SEQRES 18 F 264 THR LEU ALA ASN THR ARG ALA TYR GLN GLN SER ARG ARG SEQRES 19 F 264 ALA ARG ILE TRP PHE PRO MET PHE SER PHE PHE GLU CYS SEQRES 20 F 264 ASN VAL ASN GLY THR VAL PRO ASN GLU TYR CYS TRP PRO SEQRES 21 F 264 PHE SER LYS PRO HET 16C A 500 38 HET 16C B 500 38 HET 16C C 500 38 HET 16C D 500 38 HET 16C E 500 38 HET 16C F 500 38 HETNAM 16C N-((E,2S,3R)-1,3-DIHYDROXYOCTADEC-4-EN-2-YL)PALMITAMIDE HETSYN 16C C16-CERAMIDE; N-PALMITOYL-D-ERYTHRO-SPHINGOSINE; (2S, HETSYN 2 16C 3R,4E)-2-PALMITOYLAMINOOCTADEC-4-ENE-1,3-DIOL; (2S,3R, HETSYN 3 16C 4E)-2-PALMITOYLAMINO-1,3-OCTADEC-4-ENEDIOL FORMUL 7 16C 6(C34 H67 N O3) HELIX 1 AA1 LYS A 151 VAL A 177 1 27 HELIX 2 AA2 PHE A 201 LEU A 221 1 21 HELIX 3 AA3 HIS A 224 THR A 250 1 27 HELIX 4 AA4 GLU A 271 SER A 281 1 11 HELIX 5 AA5 SER A 299 TYR A 315 1 17 HELIX 6 AA6 PHE A 322 ALA A 341 1 20 HELIX 7 AA7 TYR A 345 ARG A 370 1 26 HELIX 8 AA8 PHE A 385 CYS A 390 1 6 HELIX 9 AA9 TRP B 150 GLU B 175 1 26 HELIX 10 AB1 TRP B 199 LEU B 221 1 23 HELIX 11 AB2 HIS B 224 THR B 250 1 27 HELIX 12 AB3 GLU B 271 SER B 281 1 11 HELIX 13 AB4 SER B 299 TYR B 315 1 17 HELIX 14 AB5 PHE B 322 ALA B 341 1 20 HELIX 15 AB6 TYR B 345 ASN B 368 1 24 HELIX 16 AB7 ARG B 370 SER B 375 1 6 HELIX 17 AB8 PHE B 385 CYS B 390 1 6 HELIX 18 AB9 GLU C 148 VAL C 177 1 30 HELIX 19 AC1 TRP C 199 LEU C 221 1 23 HELIX 20 AC2 HIS C 224 THR C 250 1 27 HELIX 21 AC3 GLU C 271 SER C 281 1 11 HELIX 22 AC4 SER C 299 TYR C 315 1 17 HELIX 23 AC5 PHE C 322 ALA C 341 1 20 HELIX 24 AC6 TYR C 345 ARG C 370 1 26 HELIX 25 AC7 ARG C 370 SER C 375 1 6 HELIX 26 AC8 MET C 384 GLU C 389 1 6 HELIX 27 AC9 TRP D 150 GLU D 175 1 26 HELIX 28 AD1 ALA D 200 ALA D 202 5 3 HELIX 29 AD2 MET D 203 LEU D 221 1 19 HELIX 30 AD3 HIS D 224 THR D 250 1 27 HELIX 31 AD4 TRP D 270 SER D 281 1 12 HELIX 32 AD5 SER D 299 TYR D 315 1 17 HELIX 33 AD6 PHE D 322 ALA D 341 1 20 HELIX 34 AD7 TYR D 345 ARG D 370 1 26 HELIX 35 AD8 ARG D 370 SER D 375 1 6 HELIX 36 AD9 PHE D 385 CYS D 390 1 6 HELIX 37 AE1 GLU E 148 VAL E 177 1 30 HELIX 38 AE2 MET E 203 LEU E 221 1 19 HELIX 39 AE3 HIS E 224 THR E 250 1 27 HELIX 40 AE4 GLU E 271 SER E 281 1 11 HELIX 41 AE5 SER E 299 TYR E 315 1 17 HELIX 42 AE6 PHE E 322 ALA E 341 1 20 HELIX 43 AE7 TYR E 345 ARG E 370 1 26 HELIX 44 AE8 MET E 384 CYS E 390 1 7 HELIX 45 AE9 TYR F 149 VAL F 177 1 29 HELIX 46 AF1 TRP F 199 LEU F 221 1 23 HELIX 47 AF2 HIS F 224 THR F 250 1 27 HELIX 48 AF3 GLU F 271 SER F 281 1 11 HELIX 49 AF4 SER F 299 TYR F 315 1 17 HELIX 50 AF5 PHE F 322 ALA F 341 1 20 HELIX 51 AF6 TYR F 345 THR F 369 1 25 HELIX 52 AF7 ARG F 370 SER F 375 1 6 HELIX 53 AF8 MET F 384 GLU F 389 1 6 SSBOND 1 CYS A 261 CYS A 293 1555 1555 2.04 SSBOND 2 CYS B 261 CYS B 293 1555 1555 2.03 SSBOND 3 CYS C 261 CYS C 293 1555 1555 2.04 SSBOND 4 CYS D 261 CYS D 293 1555 1555 2.04 SSBOND 5 CYS E 261 CYS E 293 1555 1555 2.04 SSBOND 6 CYS F 261 CYS F 293 1555 1555 2.04 CRYST1 1.000 1.000 1.000 90.00 90.00 90.00 P 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 1.000000 0.000000 0.000000 0.00000 SCALE2 0.000000 1.000000 0.000000 0.00000 SCALE3 0.000000 0.000000 1.000000 0.00000