Identification of variant forms of the neuroendocrine peptide galanin

2004 
Galanin is a neuroendocrine peptide widely distributed in the central and peripheral nervous systems and in endocrine tissues. Using radioimmunoassays, chromatographic separations, and tandem mass spectrometry, we have identified a series of five variant forms of galanin purified from porcine upper intestine. The modified variants include three β-aspartyl-shifted forms, an oxidized form containing Trp monooxide, and an N-terminally truncated form. All were found to be C-terminally amidated. At least the β-aspartyl-shifted forms could be of native occurrence. Mechanistic explanations of the mass spectrometric fragmentation patterns of the different forms are suggested. Copyright © 2004 John Wiley & Sons, Ltd.
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