A ribonucleoprotein complex that contains small nuclear RNA U5, a heptameric ring of Sm proteins, as well as several proteins that are unique to the U5 snRNP, most of which remain associated with the U5 snRNA both while the U5 snRNP is free or assembled into a series of spliceosomal complexes.

OBSOLETE. Brilliant blue copper-containing protein of low molecular weight found in some bacteria; thought to transfer electrons to cytochrome oxidase. This definition includes pseudoazurin.

OBSOLETE. A copper-containing electron carrier acting between cytochrome b(6)-f and P700 of photosystem I.

A ribonucleoprotein complex that contains the U7 snRNA and is required for the 3'-end processing of replication-dependent histone pre-mRNAs.

OBSOLETE. A copper-containing entity that serves as an electron acceptor and electron donor in an electron transport system.

OBSOLETE. (Was not defined before being made obsolete).

A ribonucleoprotein complex that contains small nuclear RNA U1, a heptameric ring of Sm proteins, as well as several proteins that are unique to the U1 snRNP, most of which remain associated with the U1 snRNA both while the U1 snRNP is free or assembled into a series of spliceosomal complexes.

OBSOLETE. (Was not defined before being made obsolete).

A ribonucleoprotein complex that contains small nuclear RNA U2, a heptameric ring of Sm proteins, as well as several proteins that are unique to the U2 snRNP, most of which remain associated with the U2 snRNA both while the U2 snRNP is free or assembled into a series of spliceosomal complexes.

OBSOLETE. Catalysis of the four-electron reduction of dioxygen (O2) to water, coupled to generation of a proton electrochemical gradient across a membrane.

A ribonucleoprotein complex that contains small nuclear RNA U4, a heptameric ring of Sm proteins, as well as several proteins that are unique to the U4 snRNP, most of which remain associated with the U4 snRNA both while the U4 snRNP is free or assembled into the U4/U6 snRNP or into a series of spliceosomal complexes.

A ribonucleoprotein complex that contains small nuclear RNA U6, the Lsm2-8 heptameric ring complex, as well as several proteins that are unique to the U6 snRNP, most of which remain associated with the U6 snRNA both while the U6 snRNP is free or assembled into the U4/U6 snRNP or into a series of spliceosomal complexes.

OBSOLETE. (Was not defined before being made obsolete).

Any spliceosomal complex that forms during the splicing of a messenger RNA primary transcript to excise an intron; the series of U12-type spliceosomal complexes is involved in the splicing of the majority of introns that contain atypical AT-AC terminal dinucleotides, as well as other non-canonical introns. The entire splice site signal, not just the terminal dinucleotides, is involved in determining which spliceosome utilizes the site.

Binding to a pre-mRNA 3' splice site sequence.

Binding to a U6 small nuclear RNA (U6 snRNA) at the 3' end.

Binding to a U6 small nuclear RNA (U6 snRNA).

Binding to a U2 small nuclear RNA (U2 snRNA).

Binding to a U4 small nuclear RNA (U4 snRNA).

Binding to a U4atac small nuclear RNA (U4atac snRNA).