Overview
The TER record indicates the end of a list of ATOM/HETATM records for a chain.
Record Format
COLUMNS DATA TYPE FIELD DEFINITION ------------------------------------------------------------------------- 1 - 6 Record name "TER " 7 - 11 Integer serial Serial number. 18 - 20 Residue name resName Residue name. 22 Character chainID Chain identifier. 23 - 26 Integer resSeq Residue sequence number. 27 AChar iCode Insertion code.
Details
* Every chain of ATOM/HETATM records presented on SEQRES records is terminated with a TER record.
* The TER records occur in the coordinate section of the entry, and indicate the last residue presented for each polypeptide and/or nucleic acid chain for which there are coordinates. For proteins, the residue defined on the TER record is the carboxy-terminal residue; for nucleic acids it is the 3'-terminal residue.
* For a cyclic molecule, the choice of termini is arbitrary.
* Terminal oxygen atoms are presented as OXT for proteins, and as O5T or O3T for nucleic acids.
* The TER record has the same residue name, chain identifier, sequence number and insertion code as the terminal residue. The serial number of the TER record is one number greater than the serial number of the ATOM/HETATM preceding the TER.
* For chains with gaps due to disorder, it is recommended that the C-terminus atoms be labelled O and OXT, and a REMARK explaining the ambiguity be provided.
Verification/Validation/Value Authority Control
TER must appear at the end carboxy or 3' of a chain. For proteins, there is usually a terminal oxygen, labeled OXT. The validation program checks for the occurrence of TER and OXT records.
Relationships to Other Record Types
The residue name appearing on the TER record must be the same as the residue name of the immediately preceding ATOM or non-water HETATM record.
Example
1 2 3 4 5 6 7 8 12345678901234567890123456789012345678901234567890123456789012345678901234567890 ATOM 4150 H ALA A 431 8.674 16.036 12.858 1.00 0.00 H TER 4151 ALA A 431 ATOM 1403 O PRO P 22 12.701 33.564 15.827 1.09 18.03 O ATOM 1404 CB PRO P 22 13.512 32.617 18.642 1.09 9.32 C ATOM 1405 CG PRO P 22 12.828 33.382 19.740 1.09 12.23 C ATOM 1406 CD PRO P 22 12.324 34.603 18.985 1.09 11.47 C HETATM 1407 CA BLE P 1 14.625 32.240 14.151 1.09 16.76 C HETATM 1408 CB BLE P 1 15.610 33.091 13.297 1.09 16.56 C HETATM 1409 CG BLE P 1 15.558 34.629 13.373 1.09 14.27 C HETATM 1410 CD1 BLE P 1 16.601 35.208 12.440 1.09 14.75 C HETATM 1411 CD2 BLE P 1 14.209 35.160 12.930 1.09 15.60 C HETATM 1412 N BLE P 1 14.777 32.703 15.531 1.09 14.79 N HETATM 1413 B BLE P 1 14.921 30.655 14.194 1.09 15.56 B HETATM 1414 O1 BLE P 1 14.852 30.178 12.832 1.09 16.10 O HETATM 1415 O2 BLE P 1 13.775 30.147 14.862 1.09 20.95 O TER 1416 BLE P 1