Format

Send to

Choose Destination
Biol Mass Spectrom. 1992 Feb;21(2):92-6.

Some proline substituent effects in the tandem mass spectrum of protonated pentaalanine.

Author information

1
Department of Chemistry, University of North Carolina, Chapel Hill 27599-3290.

Abstract

Tandem mass spectral effects of the replacement of alanine by proline in pentaalanine were studied. The principal difference when residue 3 or 4 is proline is the great enhancement of the y3 or y2 ion, respectively. This is precisely the principal difference which thermochemical arguments predict, since a y-type ion with N-terminal proline is estimated to be 32 kJ mol-1 more stable than with N-terminal alanine. When this proline effect and the effect of neutral diketopiperazine loss occur simultaneously, the y-type ion is not observed, as predicted from the additivity of substituent effects by the kinetic approach. No interpretation is offered for observations of b-type ion intensities, since the pattern is not obvious to us.

PMID:
1606186
DOI:
10.1002/bms.1200210206
[Indexed for MEDLINE]

Supplemental Content

Loading ...
Support Center