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1U6B

CRYSTAL STRUCTURE OF A SELF-SPLICING GROUP I INTRON WITH BOTH EXONS

Replaces:  1T42
Entity
Entity IDChain IDDescriptionTypeChain lengthFormula weightNumber of moleculesDB Name (Accession)Biological sourceDescriptive keywords
1A
(B)
197-MERpolymer19764057.01
2B
(C)
5'-R(*AP*AP*GP*CP*CP*AP*CP*AP*CP*AP*AP*AP*CP*CP*AP*GP*AP*CP*GP *GP*CP*C)-3'polymer227045.41
3C
(D)
5'-R(*CP*AP*(5MU))-3'polymer3909.61
4D
(A)
U1 small nuclear ribonucleoprotein Apolymer9811340.31UniProt (P09012)
Pfam (PF00076)
Homo sapiens (human)U1 snRNP protein A, U1A protein, U1-A
5E, F, G, H, I
(B)
POTASSIUM IONnon-polymer39.15Chemie (K)
6J, K, L, M, N...
(B)
MAGNESIUM IONnon-polymer24.313Chemie (MG)
7W, X, Y
(B, C, D)
waterwater18.054Chemie (HOH)
Sequence modifications
A: 1 - 98 (UniProt: P09012)
PDBExternal DatabaseDetails
His 31Tyr 31engineered mutation
Arg 36Gln 36engineered mutation
Sequence viewer
Contents of the asymmetric unit
PolymersNumber of chains4
Total formula weight83352.3
Non-Polymers*Number of molecules18
Total formula weight511.5
All*Total formula weight83863.8
*Water molecules are not included.

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PDB entries from 2025-08-27

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