I am modeling three structures using MODELLER, I am trying to merge these three model structures to form a unique model through but it is giving an error:
rdpdb___303E> No atoms were read from the specified input PDB file, since the starting residue number and/or chain id in MODEL_SEGMENT (or the alignment file header) was not found; requested starting position: residue number " 1", chain " B"; atom file name: seq1.pdb
See this seq1.pdb file
ATOM 1 N VAL B 1 -3.688 6.501 -8.574 1.00 2.92 N
ATOM 2 CA VAL B 1 -4.616 5.667 -9.379 1.00 2.92 C
ATOM 3 C VAL B 1 -3.907 4.863 -10.492 1.00 2.92 C
ATOM 4 O VAL B 1 -4.267 3.725 -10.790 1.00 2.92 O
ATOM 5 CB VAL B 1 -5.747 6.546 -9.951 1.00 2.92 C
ATOM 6 CG1 VAL B 1 -5.221 7.681 -10.840 1.00 2.92 C
ATOM 7 CG2 VAL B 1 -6.800 5.719 -10.700 1.00 2.92 C
ATOM 8 N SER B 2 -2.805 5.439 -10.960 1.00 2.76 N
ATOM 9 CA SER B 2 -2.033 4.899 -12.094 1.00 2.76 C
ATOM 10 C SER B 2 -1.021 3.833 -11.652 1.00 2.76 C
ATOM 11 O SER B 2 -0.274 3.297 -12.463 1.00 2.76 O
ATOM 12 CB SER B 2 -1.296 6.042 -12.800 1.00 2.76 C
ATOM 13 OG SER B 2 -2.232 7.057 -13.174 1.00 2.76 O
Its seq1.pdb made by modeller
might it be that you are searching for chain B and you have chain A in the sequence file?
No sir it consist of A chain and B chain also but I copy only A chain for sample
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