The first three-dimensional structure of DHHC proteins—enzymes involved in many cellular processes, including cancer—explains how they function and may offer a blueprint for designing therapeutic drugs. Researchers have proposed blocking DHHC activity to boost the effectiveness of first-line treatments against common forms of lung and breast cancer. However, there are currently no licensed drugs that target specific DHHC enzymes. The study, led by researchers at the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), appears in the latest issue of Science.