TITLE     Cryo-EM structure of complement C4b in complex with nanobody E3
COMPND    MOL_ID: 2;
COMPND   2 MOLECULE: Complement C4 alpha chain;
COMPND   3 CHAIN: B;
COMPND   4 MOL_ID: 3;
COMPND   5 Complement C4 gamma chain;
COMPND   6 CHAIN: C;
EXPDTA     ELECTRON MICROSCOPY
DBREF  7B2M B  680  1446  UNP    P0C0L4   CO4A_HUMAN     680   1446
DBREF  7B2M C 1454  1744  UNP    P0C0L4   CO4A_HUMAN    1454   1744
SEQRES   1 C  109  ARG VAL HIS TYR THR VAL CYS ILE TRP ARG ASN GLY LYS
SEQRES   2 C  109  VAL GLY LEU SER GLY MET ALA ILE ALA ASP VAL THR LEU
SEQRES   3 C  109  LEU SER GLY PHE HIS ALA LEU ARG ALA ASP LEU GLU LYS
SEQRES   4 C  109  LEU THR SER LEU SER ASP ARG TYR VAL SER HIS PHE GLU
SEQRES   5 C  109  THR GLU GLY PRO HIS VAL LEU LEU TYR PHE ASP SER VAL
SEQRES   6 C  109  PRO THR SER ARG GLU CYS VAL GLY PHE GLU ALA VAL GLN
SEQRES   7 C  109  GLU VAL PRO VAL GLY LEU VAL GLN PRO ALA SER ALA THR
SEQRES   8 C  109  LEU TYR ASP TYR TYR ASN PRO GLU ARG ARG CYS SER VAL
SEQRES   9 C  109  PHE TYR GLY ALA PRO