Sequence alignment between 2kkd(A) and UniProt seq P00269 (RUBR_DESVH):

P00269 (RUBR_DESVH): Rubredoxin from Desulfovibrio vulgaris (strain ATCC 29579 / DSM 644 / NCIMB 8303 / VKM B-1760 / Hildenborough) 
                 10        20        30        40        50  
         ---------+---------+---------+---------+---------+--
UniProt: MKKYVCTVCGYEYDPAEGDPDNGVKPGTSFDDLPADWVCPVCGAPKSEFEAA
PDB seq: MKKYVCTVCGYEYDPAEGDPDNGVKPGTSFDDLPADWVCPVCGAPKSEFEAA
         ---------+---------+---------+---------+---------+--
                 10        20        30        40        50