SL snRNP

A ribonucleoprotein complex that contains spliced leader (SL) RNA and associated proteins.

formation of quadruple SL/U4/U5/U6 snRNP

Formation of a quadruple snRNP complex composed of the spliced leader (SL) RNA along with the U4/U6-U5 tri-snRNP complex. Interactions that may facilitate this include a duplex between the SL and U6 RNAs and interactions between the U5 RNA and the exon sequence at the 5' splice site within the SL RNA.

nicotinate nucleotide salvage

The generation of nicotinate nucleotide without de novo synthesis.

mRNA trans splicing, SL addition

The joining together of two independently transcribed RNAs, where the one that provides the 5' portion of the final mRNA is from a splice leader RNA (SL-RNA). The SL-RNA, or mini-exon donor sequence, is added to the 5'-end of the acceptor RNA molecule which provides the mRNA body.

trans assembly of SL-containing precatalytic spliceosome

Assembly of a spliceosomal complex containing the SL RNA and the pre-mRNA to be joined, as well as all the spliceosomal snRNPs involved in trans leader splicing. Formation of the trans leader spliceosome brings together the quadruple SL/U4/U5/U6 snRNP and the complex of the U2 snRNP with the splice site of the pre-mRNA.

deoxyguanosine salvage

Any process that generates deoxyguanosine from derivatives of it, without de novo synthesis.

microtubule nucleation by spindle pole body

The 'de novo' formation of a microtubule, mediated by the spindle pole body.

deoxyinosine salvage

Any process that generates deoxyinosine from derivatives of it, without de novo synthesis.

microtubule nucleation by microtubule organizing center

The 'de novo' formation of a microtubule, mediated by the microtubule organizing center.

queuosine salvage

Any process which produces queuosine from derivatives of it, without de novo synthesis.