[DAS] gene annotation

[RIDVAN EKSI]

Hello,
I want to have an annotation file that includes everything known about every genes for mouses. MGI database has a lot of field but it does not include some parts for example protein-protein interaction. So a couple of databases should be merged to have this kind of annotation file. I wonder is it possible with DAS, or is there any tool that already does that. 
Thanks in advance

Ridvan Eksi