Basically most of the peptides are identified through
Liquid chromatography–mass spectrometry So if it is possible to take sequences from this we can align those sequences to find the next area in genome of other organism to study
"Is it possible to get Amino acid and gene sequences after protein analysis with Liquid chromatography–mass spectrometry?"
Liquid chromatography–mass spectrometry are techniques to identify components of a complex mixture and will be used to derive sequence of individual peptides. Once you have protein sequence obviously you can find/generate DNA sequence using the following