Ordering and renaming Columns in Pandas data frame - Elegant Solution Possible?

Question

I have a dataframe as follows:

   df 
        ATG@FTY@RG@NUMFB@ZQ=CT    QTG@SSTY@RG@NUMFB@ZQ=ED   WQTG@SSTWY@RGW@NUMFB@ZQ=XED QQTG@SSTQY@RGQ@NUMFB@ZQ=XXED