Formation of N-pyroglutamyl peptides from N-Glu and N-Gln precursors in Aplysia neurons.

Abstract:

:Matrix-assisted laser desorption/ionization with time-of-flight mass spectrometry is used to examine the formation of N-pyroglutamate (pGlu) in single, identified neurons from Aplysia. Six pGlu peptides are identified in the R3-14 and the R15 neurons that result from in vivo processing of peptides containing either Glu or Gln at their respective N-termini. Moreover, we show that Glu-derived pGlu is not a sample collection or measurement artifact. The pGlu peptides are detected in isolated cell bodies, regenerated neurites in culture, interganglionic connective nerves, cell homogenates, and collected releasates. We also demonstrate that R3-14 cells readily convert a synthetic N-Glu peptide to its pGlu analogue, indicating the presence of novel enzymatic activity.

journal_name

J Neurochem

authors

Garden RW,Moroz TP,Gleeson JM,Floyd PD,Li L,Rubakhin SS,Sweedler JV

doi

10.1046/j.1471-4159.1999.0720676.x

subject

Has Abstract

pub_date

1999-02-01 00:00:00

pages

676-81

issue

2

eissn

0022-3042

issn

1471-4159

journal_volume

72

pub_type

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