Information in the SEQRES records of the PDB entry and the sequence database The SEQADV record identifies differences between sequence The DBREF record providesĬross-reference links between PDB sequences (what appears in SEQRES record) andĪ corresponding database sequence. Overall structure, or a particular portion of it. For example, a researcher mayĬhange or mutate particular residues to see the effect this will have on the Not in the observed structure/coordinates).ĭifferences with sequences in other databases. residues whichĮxist in the originally studied molecule as shown in the SEQRES records, but Of the molecule that have not been observed (e.g. These cases, a "REMARK 465" entry will be included in the header of the PDBįile to identify each missing residue. Records, since the portion of the chain was present during the experiment. However, these amino acids will often be included in the SEQRES The ends of chains and mobile loops are often not observed inĬrystallographic experiments, and coordinates are not included as ATOM records In many cases, you may find that the coordinates presented inĪTOM records in a PDB file may not exactly match the sequence in the SEQRES SEQRES 4 A 63 GLU GLU LEU LEU SER LYS ASN TYR HIS LEU SEQRES 3 A 63 ARG LYS LEU GLN ARG MET LYS GLN LEU GLU SEQRES 2 A 63 ARG ALA ARG ASN THR GLU ALA ALA ARG ARG SEQRES 1 A 63 MET ILE VAL PRO GLU SER SER ASP PRO ALA SEQRES 1 B 19 DT DG DG DA DG DA DT DG DA DC DG DT DC
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