spliceosome A complex (prespliceosome)

Function: - 2nd complex of spliceosome assembly - U2 snRNP is recruited to the branch region of a splice site through interactions with the 'E complex' & becomes tightly associated with the branch point sequence to form 'complex A' Structure: - consist of hnRNA, U1 snRNP, U2 snRNP, U2AF

References

- Wikipedia: Spliceosome http://en.wikipedia.org/wiki/spliceosome