Sequence alignment between 1k8a(3) and UniProt seq P22452 (RL39_HALMA):

P22452 (RL39_HALMA): Large ribosomal subunit protein eL39 from Haloarcula marismortui (strain ATCC 43049 / DSM 3752 / JCM 8966 / VKM B-1809) 
                 10        20        30        40        50
         ---------+---------+---------+---------+---------+
UniProt: MGKKSKATKKRLAKLDNQNSRVPAWVMLKTDREVQRNHKRRHWRRNDTDE
         ...............................XXXX...............
PDB seq: -GKKSKATKKRLAKLDNQNSRVPAWVMLKTD---ERNHKRRHWRRNDTDE
          ---------+---------+---------+   ------+---------
                  10        20        30        40