Just a clarification (because it's not specified on the rules) the residues 1-85 refers to those on the B chain, correct? It's the only chain actually labeled "Anti-CRISPR protein," but I'd like confirmation before I show up to competition with the wrong chain. XP
Also, does anyone have any tips for finding what "functionally relevant features" to note on the model? I did this as a trial event last year, and trying to figure out what to mark was the thing my partner and I struggled with the most.
To the first question, I believe so. After playing around with it in the JSmol on CBM's website, it appears that the 5vw1.pdb file contains an A and a B chain, however, after manipulating a handful of things in the environment, it appears that the B chain seems to be 85 residues long (not counting residue 0, which exists in this pdb file) and is completely detached from the A chain (which is many more amino acids long yet still has a 1-85 as well). However, the provided JSmol design environment on the official website for protein modeling does say B chain in its prebuild visualization environment, which is why you could reasonably suspect that the prebuild is that way. If you really, really want to make sure, you could submit a FAQ or clarification to the National Committee here
if you feel like it.
In terms of the bonus "functionally relevant features" part, my best recommendation is to read the paper that the protein is based off of to determine those. The paper will give you plenty of ideas by mentioning several different very crucial amino acids, ligands, or any other things critical to the protein function. Then it's up to you to decide which ones you would want to portray, if any, and how you want to do that.