Sequence alignment between 2k4n(A) and UniProt seq Q8U449 (Q8U449_PYRFU):

Q8U449 (Q8U449_PYRFU): Uncharacterized protein from Pyrococcus furiosus (strain ATCC 43587 / DSM 3638 / JCM 8422 / Vc1) 
                 10        20        30        40        50        60        70        80        90       100           
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---
UniProt: MNSEVIKEFLEDIGEDYIELENEIHLKPEVFYEVWKYVGEPELKTYVIEDEIVEPGEYDPPEMKYTNVKKVKIKKVYFETLDNVRVVTDYSEFQKILKKRGTK--------
PDB seq: MNSEVIKEFLEDIGEDYIELENEIHLKPEVFYEVWKYVGEPELKTYVIEDEIVEPGEYDPPEMKYTNVKKVKIKKVYFETLDNVRVVTDYSEFQKILKKRGTKLEHHHHHH
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+-
                 10        20        30        40        50        60        70        80        90       100       110