I am trying to build to both phosphorylated and sulfated tyrosine containing peptide squences to use for docking. Unfortunately, I am unable to use the BuildPeptide command to construct these peptides as aI always recieve a Segmentation Fault error. I would appreciate any help. I have been trying to convert the starting fasta sequences: GY[TYR:phosphorylated]EEIA and GY[TYR:sulfated]EEIA without any luck. I have been able to construct the unmodified peptide, GYEEIA, successfully.
On another note, I was curious if I had to be concerned when trying to dock these modified peptides using the FlexPepDock command. Any information would be helpful.