RNA polymerase beta subunit external 1 domain
RNA polymerases catalyze the DNA-dependent polymerisation of RNA. Prokaryotes contain a single RNA polymerase compared with three in eukaryotes (not including mitochondrial or chloroplast polymerases). This domain in prokaryotes spans the gap between domains 4 and 5 of the yeast protein. It is also known as the external 1 region of the polymerase and is bound in association with the external 2 region.
Jiyao W et al.(2023). "The conserved domain database in 2023.",