Sequence alignment between 1rn4(A) and UniProt seq P00651 (RNT1_ASPOR):

P00651 (RNT1_ASPOR): Guanyl-specific ribonuclease T1 from Aspergillus oryzae (strain ATCC 42149 / RIB 40)
                 10        20        30        40        50        60        70        80        90       100       110       120       130
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
UniProt: MMYSKLLTLTTLLLPTALALPSLVERACDYTCGSNCYSSSDVSTAQAAGYQLHEDGETVGSNSYPHKYNNYEGFDFSVSSPYYEWPILSSGDVYSGGSPGADRVVFNENNQLAGVITHTGASGNNFVECT
         ..................................................X..................................................................X.XXXX.......
PDB seq: --------------------------ACDYTCGSNCYSSSDVSTAQAAGYKLHEDGETVGSNSYPHKYNNYEGFDFSVSSPYYEWPILSSGDVYSGGSPGADRVVFNENNQLAGVITAT----NNFVECT
                                   ---------+---------+---------+---------+---------+---------+---------+---------+---------+---    --+----
                                           10        20        30        40        50        60        70        80        90       100