U-U Base Pairing
Cis geometry
PDB freq.
Isosteric pairs
XVI
Cis W.-C./W.-C.
102 (0.19%)
CC131, CU106
82
Cis W.C./C-H
(annotated as a 81)
?
Trans geometry
PDB freq.
Isosteric pairs
XII
Trans W.-C./W.-C.
4 (0.007%)
(not found)
CCXIV
XIII
Trans W.-C./W.-C.
4 (0.007%)
reversible
81
Trans W.C./C-H
118 (0.22%)
AAV, ACXXV, AG60