Sequence alignment between 5jb3(Y) and UniProt seq Q8U443 (RS27A_PYRFU):

Q8U443 (RS27A_PYRFU): Small ribosomal subunit protein eS31 from Pyrococcus furiosus (strain ATCC 43587 / DSM 3638 / JCM 8422 / Vc1) 
                 10        20        30        40        50
         ---------+---------+---------+---------+---------+
UniProt: MGQKWKLYEIKDGKVIRKNKFCPRCGPGVFMADHGDRWACGKCGYTEWKK
PDB seq: MGQKWKLYEIKDGKVIRKNKFCPRCGPGVFMADHGDRWACGKCGYTEWKK
         ---------+---------+---------+---------+---------+
                 10        20        30        40        50