Fig. 4From: Mechanism of transcription-coupled DNA modification recognitionThe structure of RNA pol II elongation complex with 5caC, in which 5caC adopts the similar “above-bridge-helix” conformation. 5caC can form a specific hydrogen bond with key residue Q531 of the Rpb2 subunit. The bridge helix is shown in green, and RNA and DNA are shown in red and blue, respectivelyBack to article page