. 2013 Apr 17;22(6):677–692. doi: 10.1002/pro.2266

Table I.

Major Crystallographic or NMR Structures (Complete or Partial) of Unique Spliceosomal Protein or RNA Components Determined to Date

snRNP	Unique protein or RNA structures (complete or partial) determined
U1	U1 snRNP, U1-70K, U1A, U1C, and Prp40
U2	SF3a components (Prp9, Prp11, Prp21), SF3b components (SF3b155, SF3b14, SF3b2, SF3b4), U2AF³⁵, U2AF⁶⁵, PUF60, SPF45, U2 A', U2 B'', and BPS/U2 snRNA
U4	U4 snRNP Sm core, and U4 snRNA
U5	Prp8, Brr2, Aar2, 15K, and 52K
U6	Prp24, U6 snRNA, and Lsm3–7
U4/U6.U5	Snu66, 15.5K, Prp31, and Snu13p
U4/U6	Prp3, Cyclophilin H, and Prp4
Components common to all snRNPs	Sm D1, D2, D3, B, E, F, and G
Non-snRNP associated	UAP56, SF1, Pml1, Dim2, Cwc2, Prp19, Rbm22, Prp43, Prp18, Prp22, and U2/U6 snRNA

When more than one homologous structure of a protein is available, only the protein from one species is listed. More details of the structure are provided in Supporting Information Table I.