Functional similarities between the dictyostelium protein AprA and the human protein dipeptidyl-peptidase IV. Academic Article uri icon


  • Autocrine proliferation repressor protein A (AprA) is a protein secreted by Dictyostelium discoideum cells. Although there is very little sequence similarity between AprA and any human protein, AprA has a predicted structural similarity to the human protein dipeptidyl peptidase IV (DPPIV). AprA is a chemorepellent for Dictyostelium cells, and DPPIV is a chemorepellent for neutrophils. This led us to investigate if AprA and DPPIV have additional functional similarities. We find that like AprA, DPPIV is a chemorepellent for, and inhibits the proliferation of, D. discoideum cells, and that AprA binds some DPPIV binding partners such as fibronectin. Conversely, rAprA has DPPIV-like protease activity. These results indicate a functional similarity between two eukaryotic chemorepellent proteins with very little sequence similarity, and emphasize the usefulness of using a predicted protein structure to search a protein structure database, in addition to searching for proteins with similar sequences.

published proceedings

  • Protein Sci

author list (cited authors)

  • Herlihy, S. E., Tang, Y. u., Phillips, J. E., & Gomer, R. H.

citation count

  • 12

complete list of authors

  • Herlihy, Sarah E||Tang, Yu||Phillips, Jonathan E||Gomer, Richard H

publication date

  • March 2017