Sequence alignment between 1vif(A) and UniProt seq P00383 (DYR21_ECOLX):

P00383 (DYR21_ECOLX): Dihydrofolate reductase type 2 from Escherichia coli 
                 10        20        30        40        50        60        70        
         ---------+---------+---------+---------+---------+---------+---------+--------
UniProt: MERSSNEVSNPVAGNFVFPSNATFGMGDRVRKKSGAAWQGQIVGWYCTNLTPEGYAVESEAHPGSVQIYPVAALERIN
PDB seq: ------------------PSNATFGMGDRVRKKSGAAWQGQIVGWYCTNLTPEGYAVESEAHPGSVQIYPVAALERIN
                           -+---------+---------+---------+---------+---------+--------
                           20        30        40        50        60        70