Is there a way to download the proteome of an organism from GenBank?
Yes, if the organism is represented in Entrez Genomes. Navigate to the Entrez Genomes summary page for the organism in question and click on the Protein Coding Genes link in the Feature table. A table will be displayed giving the protein coding regions of the genome and links to corresponding protein sequences. This table, as well as the corresponding protein sequences, can be saved to a local file. Entrez Genomes is found at www.ncbi.nlm.nih.gov/Entrez/Genome/main_genomes.html.