obsolete RNA polymerase II transcription coactivator activity involved in preinitiation complex assembly true OBSOLETE. Binding to an RNA polymerase II (RNAP II) regulatory transcription factor and also with the RNAP II basal transcription machinery in order to increase the frequency, rate or stability of the aggregation, arrangement and bonding together of proteins on RNA polymerase II promoter DNA to form the transcriptional preinitiation complex (PIC). Cofactors generally do not bind DNA, but rather mediate protein-protein interactions between activating transcription factors and the basal RNAP II transcription machinery. krc RNA polymerase II transcription coactivator activity involved in preinitiation complex assembly GO:0001128 This term was obsoleted because it represented a mix of function and process and is not annotated consistently 2011-01-20T02:13:36Z molecular_function