| Name | generation of catalytic spliceosome for first transesterification step |
| ID | GO_0000349 |
| collection_id | Biological process |
| Alternative ID | GO:0000356, GO:0000357 |
| Exact synonym | formation of catalytic spliceosome for first transesterification step |
| Description | Formation of a catalytic spliceosome complex ready to perform the first splicing reaction. This occurs by an ATP-dependent conformational change of the pre-catalytic spliceosome. |
| Related synonym | catalytic spliceosome assembly for first transesterification step |
| Comment | Note that this step represents the formation of the A2-2 complex (yeast) or the C1 complex (mammalian). |
| External URL | |
| Genes |