Sequence alignment between 4xo1(A) and UniProt seq P0AC92 (GNSA_ECOLI):

P0AC92 (GNSA_ECOLI): Protein GnsA from Escherichia coli (strain K12) 
                 10        20        30        40        50          
         ---------+---------+---------+---------+---------+-------
UniProt: MNIEELKKQAETEIADFIAQKIAELNKNTGKEVSEIRFTAREKMTGLESYDVKIKIM---
         ........................X..........X........................
PDB seq: MNIEELKKQAETEIADFIAQKIAEMNKNTGKEVSEMRFTAREKMTGLESYDVKIKIMLEH
         ---------+---------+---------+---------+---------+---------+
                 10        20        30        40        50        60