Robust protein quantitation in chromatographic fractions using MALDI-MS of tryptic peptides.

Abstract:

:A method is introduced to evaluate protein concentrations using the height sum of all MALDI-MS peaks that unambiguously match theoretic tryptic peptide masses of the protein sought after. The method uses native chromatographic protein fractionation prior to digestion but does not require any depletion, labeling, derivatization, or preparation of a compound similar to the analyte. All peak heights of tryptic peptides are normalized with the peak height of a unique standard peptide added to the MALDI-MS samples. The sum of normalized peak heights, S(n), or the normalized mean peak height, M(n), reflects the concentration of the respective protein. For fractions containing various proteins, S(n) and M(n) can be used to compare concentrations of a protein between different fractions. For fractions with one predominating protein, they can be used to estimate concentration ratios between fractions, or to quantify the fractional protein concentration after calibration with pure protein solutions. Initial native fractionation retains the possibility to apply all conventional analytic procedures. Moreover, it renders the method relatively robust to MS mass accuracy. The method was validated with albumin, transferrin, alpha1-antitrypsin, and immunoglobulin G within highly complex chromatographic fractions of pathological and normal sera, which contained the respective intact native protein in dominating as well as minor concentrations. The correlation found between S(n) and the protein concentration as determined with ELISA showed that the method can be applied to select markers for distinguishing between normal and pathological serum samples.

journal_name

Proteomics

journal_title

Proteomics

authors

Bublitz R,Kreusch S,Ditze G,Schulze M,Cumme GA,Fischer C,Winter A,Hoppe H,Rhode H

doi

10.1002/pmic.200500747

subject

Has Abstract

pub_date

2006-07-01 00:00:00

pages

3909-17

issue

13

eissn

1615-9853

issn

1615-9861

journal_volume

6

pub_type

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