Thread:BastionMonk/@comment-3213993-20150829072907

I am currently working on BLASTing the original dinosaur peptide fragments and evaulating their authenticity one-by-one. One protein sequence, GAPGPQGPSGAPGPK, is equally similar to birds and alligators (two amino acids off) as it is to collagen-like proteins in two species of bacteria. The original paper by Schweitzer says that the peptide had a hydroxyl modification to one of the proline residues. I am confused by this. If this means that this proline was a hydroxylproline, that would be strong evidence against the biofilm hypothesis. However, as hydroxylproline is a non-proteinogenic amino acid, I don't think this is the case. Could you enlighten me further as to what the hydroxyl modification means? Thanks. 