"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."@en . . . . . "generation of catalytic spliceosome for first transesterification step"@en . . . "formation of catalytic spliceosome for first transesterification step"@en . . . "generation of catalytic spliceosome for first transesterification step"@en . "generation of catalytic spliceosome for first transesterification step"@en . "GO:0000349" . . . "\u0431\u0456\u043E\u043B\u043E\u0433\u0456\u0447\u043D\u0438\u0439 \u043F\u0440\u043E\u0446\u0435\u0441"@uk . "biologisch proces"@nl . "GO:0000349"@en .