The LBS-like sequence is required for LANA to down-regulate IL-22R1 expression.

<p>(<b>A</b>) Schematic of pIL22R1 (−2139 to +39), pIL22R1ΔLBS-like and pIL22R1mLBS-like DNA sequences. (<b>B</b>) Increasing amounts of pcDNA-LANA expressing full-length LANA were co-transfected with either pIL22R1 (−2139 to +39) or its mutants (pIL22R1ΔLBS-like and pIL22R1mLBS-like) into 293T cells. At 48 h post-transfection, cells were harvested and assayed for luciferase activity. (<b>C</b>) Increasing amounts of pcDNA-LANA-C-expressing carboxyl-terminal domain (amino acids 951–1162) of LANA were co-transfected with either pIL22R1 (−2139 to +39) or its mutants (pIL22R1ΔLBS-like and pIL22R1mLBS-like) into 293T cells. At 48 h post-transfection, cells were harvested and assayed for luciferase activity. (<b>D</b>) Increasing amounts of pcDNA-LANA expressing full-length LANA were co-transfected with either pIL22R1 (−2139 to +39) or its mutants (pIL22R1ΔLBS-like and pIL-22R1mLBS-like) into HUVEC cells. At 48 h post-transfection, cells were harvested and assayed for luciferase activity.