Glossary

Pyroglutamate

Pyroglutamate is a cyclic derivative formed when an N-terminal glutamine or glutamic acid cyclises to form a lactam. Formation from glutamine releases ammonia and reduces mass by about 17 Da, while formation from glutamic acid releases water, reducing mass by about 18 Da. It blocks the N-terminus and may form during storage of susceptible peptides.

Source: en.wikipedia.org

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