PDBsum is another resource providing information about each known structure. Some of this information is very similar to that obtained from the Protein Data Bank, but PDBsum also provides some extra information calculated by separate programs.
Go to the PDBsum website and type the same code 2dn2 into the search box. Click 'Find' to get to the information about this protein.
Click on the Protein tab to get information about the protein sequence and structure. Use this information to answer the questions. Note that only one chain is displayed at a time. To look at other polypeptide chains click on the appropriate link under the Protein tab towards the bottom at the left hand side. When looking at a particular chain, the FASTA link on the right hand side of the page provides the complete amino acid sequence.