Sequence alignment between 3rdm(A) and UniProt seq P22629 (SAV_STRAV):

P22629 (SAV_STRAV): Streptavidin from Streptomyces avidinii
                 10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180   
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---
UniProt: MRKIVVAAIAVSLTTVSITASASADPSKDSKAQVSAAEAGITGTWYNQLGSTFIVTAGADGALTGTYESAVGNAESRYVLTGRYDSAPATDGSGTALGWTVAWKNNYRNAHSATTWSGQYVGGAEARINTQWLLTSGTTEANAWKSTLVGHDTFTKVKPSAASIDAAKKAGVNNGNPLDAVQQ
         ...................................X................X......................XX....................................X.................X.X.................................................
PDB seq: -----------------------------------TAEAGITGTWYNQLGSTLIVTAGADGALTGTYESAVGNAEGSYVLTGRYDSAPATDGSGTALGWTVAWKNNYRNAHSASTWSGQYVGGAEARINTQVLTTSGTTEANAWKSTLVGHDTFTKVK-------------------------
                                            -----+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+-------                         
                                                30        40        50        60        70        80        90       100       110       120       130       140