The Protein Data Bank (PDB) is celebrating its twenty-year anniversary of “Molecule of the Month”. Here we present the winner of June 2011, the glucansucrase protein. PDB has written a very interesting outline of these glucansucrase enzymes that are crucial to the CarbExplore technologies for oligosaccharide and polysaccharide synthesis, and for glucosylation of diverse acceptor substrates. Please click here to check the website of PDB.