As previous studies indicated that the RVS161 and RVS167 gene products of Saccharomyces cerevisiae seem to be involved in the same cellular function, we considered the possibility of a complex between the proteins encoded by these two genes. Using the two hybrid system, we have shown that Rvs167p interacts with Rvs161p, through its N-terminal domain which contains predicted coiled-coil structures. Moreover, if a tagged Rvs167p protein was immune adsorbed under non-denaturing conditions, it brought along the Rvs161p protein. These results confirmed the hypothesis of an in vivo complex between the two proteins. (C) 1997 Elsevier Science B.V.