https://www.helmholtz-muenchen.de/ibis/resourcesservices/genomics/funcat-the-functional-catalogue/index.html:
FunCat - The Functional Catalogue
The Functional Catalogue is an annotation scheme for the functional description of proteins of prokaryotic and eukaryotic origin. Taking into account the broad and highly diverse spectrum of known protein functions, the FunCat consists of 28 main functional categories (or branches) that cover general fields like cellular transport, metabolism and cellular communication/signal transduction.
The main branches exhibit a hierarchical, tree like structure with up to six levels of increasing specificity. In total, the FunCat version 2.1 includes 1362 functional categories. This general concept was retained since the annotation of the Saccharomyces cerevisiae genome with only 4 revisions and later on also proved to be well suited for the annotation of genomes from different domains of life (Ruepp et al. 2004). The present and previous versions as well as a version mapping file of the FunCat and annotation data of our core projects can be downloaded via


FunCat files for different organism can be downloaded from http://mips.gsf.de/funcatDB/
The file structure is described here: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC524302/