Gene ontology, GO for short, is a quite powerful bioinformatics initiative to unify the representation of gene and gene product attributes across all species. Gene Ontology is established by Gene Ontology Consortium in 2008 in order to annotate and classify genes and their corresponding products, mainly under 3 terms: molecular functions, cellular components and biological processes. More specifically, the project aims to:

Maintain and develop its controlled vocabulary of gene and gene product attributes
Annotate genes and gene products, and assimilate and disseminate annotation data
Provide tools for easy access to all aspects of the data, and enable functional interpretation of experimental data.

And GO analysis can be used for the following:

integration of proteomic data from different species
classify the differential proteins
predict the functions of specific protein domains
identify genes involved in certain diseases

With experienced bioinformatists on board, Creative Proteomics can provide GO analysis and GO Enrichment analysis, as you required.

http://www.creative-proteomics.com/services/gene-ontology-go-analysis.htm