T. Dandekar et al., CONSERVATION OF GENE ORDER - A FINGERPRINT OF PROTEINS THAT PHYSICALLY INTERACT, Trends in biochemical sciences, 23(9), 1998, pp. 324-328
A systematic comparison of nine bacterial and archaeal genomes reveals
a low level of gene-order (and operon architecture) conservation. Nev
ertheless, a number of gene pairs are conserved. The proteins encoded
by conserved gene pairs appear to interact physically. This observatio
n can therefore be used to predict functions of, and interactions betw
een, prokaryotic gene products.