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Membrane protein identification: N-terminal labeling of nontryptic membrane protein peptides facilitates database searching

In English

Författare

Summary, in English

Membrane proteins are fairly refractory to digestion especially by trypsin, and less specific proteases, such as elastase and pepsin, are much more effective. However, database searching using nontryptic peptides is much less effective because of the lack of charge localization at the N and C termini and the absence of sequence specificity. We describe a method for N-terminal-specific labeling of peptides from nontryptic digestions of membrane proteins, which facilitates Mascot database searching and can be used for relative quantitation. The conditions for digestion have been optimized to obtain peptides of a suitable length for mass spectrometry (MS) fragmentation. We show the effectiveness of the method using a plasma membrane preparation from a leukemia cell line and demonstrate a large increase in the number of membrane proteins, with small extra-membranar domains being identified in comparison to previous published methods.

Publiceringsår

2008

Språk

Engelska

Sidor

659-665

Publikation/Tidskrift/Serie

Journal of Proteome Research

Volym

7

Issue

2

Dokumenttyp

Artikel i tidskrift

Förlag

The American Chemical Society (ACS)

Ämne

  • Immunology in the medical area

Nyckelord

  • database
  • search
  • N-terminal labeling
  • proteinase K
  • membrane proteins
  • pepsin

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1535-3893