Sequence alignment between 5a5b(X) and UniProt seq O13563 (RPN13_YEAST):

O13563 (RPN13_YEAST): 26S proteasome regulatory subunit RPN13 from Saccharomyces cerevisiae (strain ATCC 204508 / S288c) 
                 10        20        30        40        50        60        70        80        90       100       110       120       130       140       150      
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+------
UniProt: MSMSSTVIKFRAGVCEYNEDSRLCTPIPVQGEIEIKPNEEEELGFWDFEWRPTEKPVGRELDPISLILIPGETMWVPIKSSKSGRIFALVFSSNERYFFWLQEKNSGNLPLNELSAKDKEIYNKMIGVLNNSSESDEEESNDEKQKAQDVDVSMQD
PDB seq: ------VIKFRAGVCEYNEDSRLCTPIPVQGEIEIKPNEEEELGFWDFEWRPTEKPVGRELDPISLILIPGETMWVPIKSSKSGRIFALVFSSNERYFFWLQEKNSGNLPLNELSAKDKEIYNKMIGVLNNSS-----------------------
               ---+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---                       
                 10        20        30        40        50        60        70        80        90       100       110       120       130