Sequence alignment between 6j4z(V) and UniProt seq C4R0E6 (C4R0E6_KOMPG):

C4R0E6 (C4R0E6_KOMPG): Transcription elongation factor SPT4 from Komagataella phaffii (strain GS115 / ATCC 20864)
                 10        20        30        40        50        60        70        80        90       100       110    
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+----
UniProt: MSTNKGVRERACMLCGIVLPGRVFMQNGCPNCDSVLNLRDSDQATVNECTSSSFEGLVAVGDNEHSWVAKWLRVDRFQPGLYAVRVDGRLPSDIVAALEQYGVYYRPRDGSVID
PDB seq: --------ERACMLCGIVLPGRVFMQNGCPNCDSVLNLRDSDQATVNECTSSSFEGLVAVGDNEHSWVAKWLRVDRFQPGLYAVRVDGRLPSDIVAALEQYGVYYRPRDG----
                 -+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+    
                 10        20        30        40        50        60        70        80        90       100       110