TITLE     Cryo-EM structure of an Escherichia coli coupled
TITLE   2 transcription-translation complex B3 (TTC-B3) containing an mRNA with
TITLE   3 a 27 nt long spacer, transcription factors NusA and NusG, and
TITLE   4 fMet-tRNAs at P-site and E-site
COMPND    MOL_ID: 14;
COMPND   2 MOLECULE: DNA-directed RNA polymerase subunit beta';
COMPND   3 CHAIN: AE;
COMPND   4 EC: 2.7.7.6;
COMPND   5 ENGINEERED: YES;
DBREF  6X9Q A    1  1407  UNP    A0A4S1NB A0A4S1NBU2_      1   1407
SEQRES   1 AE  140  ILE ILE VAL PRO SER GLN ASP VAL VAL LEU GLY LEU TYR
SEQRES   2 AE  140  TYR MET THR ARG ASP CYS VAL ASN ALA LYS GLY GLU GLY
SEQRES   3 AE  140  MET VAL LEU THR GLY PRO LYS GLU ALA GLU ARG LEU TYR
SEQRES   4 AE  140  ARG SER GLY LEU ALA SER LEU HIS ALA ARG VAL LYS VAL
SEQRES   5 AE  140  ARG ILE THR GLU TYR GLU LYS ASP ALA ASN GLY GLU LEU
SEQRES   6 AE  140  VAL ALA LYS THR SER LEU LYS ASP THR THR VAL GLY ARG
SEQRES   7 AE  140  ALA ILE LEU TRP MET ILE VAL PRO LYS GLY LEU PRO TYR
SEQRES   8 AE  140  SER ILE VAL ASN GLN ALA LEU GLY LYS LYS ALA ILE SER
SEQRES   9 AE  140  LYS MET LEU ASN THR CYS TYR ARG ILE LEU GLY LEU LYS
SEQRES  10 AE  140  PRO THR VAL ILE PHE ALA ASP GLN ILE MET TYR THR GLY
SEQRES  11 AE  140  PHE ALA TYR ALA ALA ARG SER GLY ALA SER