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Peptide mass fingerprint data from silver stained proteins can be improved by using 2,5-dihydroxybenzoic acid instead of α-cyano-4-hydroxycinnamic acid as matrix in MALDI-TOF MS
Linköpings universitet, Institutionen för klinisk och experimentell medicin, Yrkes- och miljömedicin. Linköpings universitet, Hälsouniversitetet.
Linköpings universitet, Institutionen för klinisk och experimentell medicin. Linköpings universitet, Hälsouniversitetet.
Linköpings universitet, Institutionen för klinisk och experimentell medicin, Onkologi. Linköpings universitet, Hälsouniversitetet.
Linköpings universitet, Institutionen för klinisk och experimentell medicin, Yrkes- och miljömedicin. Linköpings universitet, Hälsouniversitetet.
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2007 (Engelska)Artikel i tidskrift (Refereegranskat) Submitted
Ort, förlag, år, upplaga, sidor
2007.
Nationell ämneskategori
Medicin och hälsovetenskap
Identifikatorer
URN: urn:nbn:se:liu:diva-14352OAI: oai:DiVA.org:liu-14352DiVA, id: diva2:23300
Tillgänglig från: 2007-03-15 Skapad: 2007-03-15
Ingår i avhandling
1. Lipoproteomics: A New Approach to the Identification and Characterization of Proteins in LDL and HDL
Öppna denna publikation i ny flik eller fönster >>Lipoproteomics: A New Approach to the Identification and Characterization of Proteins in LDL and HDL
2007 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

A proteomic approach was applied to examine the protein composition of low-density lipoprotein (LDL) and high-density lipoprotein (HDL) in humans. LDL and HDL were isolated by density gradient ultracentrifugation, and proteins were separated with twodimensional gel electrophoresis (2-DE) and identified with peptide mass fingerprinting, using matrix-assisted laser desorption/ionization-time of flight mass spectrometry, and with amino acid sequencing using electrospray ionization tandem mass spectrometry. To improve the identification of low abundant proteins in silver stained 2-DE gels, 2,5-dihydroxybenzoic acid was used instead of α-cyano-4-hydroxycinnamic acid as matrix in the peptide mass fingerprinting procedure; this was demonstrated to give more matching peptide peaks, higher sequence coverage, and higher signal to noise ratio. Altogether 18 different proteins were demonstrated in LDL and/or HDL: three of these (calgranulin A, lysozyme C and transthyretin) have not been identified in LDL before. Apo C-II, apo C-III, apo E, apo A-I, apo A-IV, apo J, apo M, serum amyloid A-IV and α1-antitrypsin were found in both LDL and HDL, while apo B-100 (clone), calgranulin A, lysozyme C and transthyretin were found only in LDL, and apo A-II, apo C-I, and serum amyloid A only in HDL. Salivary α-amylase wass identified only in HDL2, and apo L and glycosylated apo A-II only in HDL3. Many of the proteins occurred in a number of isoforms: in all, 47 different isoform identities were demonstrated. A 2-DE mobility shift assay and deglycosylation experiments were used to demonstrate, for the first time, that apo M in LDL and HDL occurs in five isoforms; three that are both N-glycosylated and sialylated, one that is N-glycosylated but not sialylated and one that is neither N-glycosylated nor sialylated. LDL from obese subjects was found to contain more apo J, apo C-II, apo M, α1-antitrypsin and serum amyloid A-IV than LDL from controls,, and also more of an acidic isoform (pI/Mr; 5.2 / 23 100) of apo A-I. In addition, the new LDLassociated protein transthyretin, was found to be significantly more abundant in LDL from obese subjects. On the other hand, the amounts of apo A-IV and the major isoform of apo A-I (pI/Mr; 5.3 / 23 100) were significantly less. Altogether, these findings (i) illustrate the power of 2-DE and mass spectrometry for detailed mapping of the proteins and their isoforms in human lipoproteins; (ii) demonstrate the presence of a number of new proteins in LDL (calgranulin A, lysozyme C and transthyretin); (iii) give precise biochemical clues to the polymorphism of apo M in LDL and HDL, and; (iv) indicate that obesity is associated with significant changes in the protein profile of LDL. It is concluded that new information on lipoproteins can easily be obtained through a proteomic approach, thus facilitating the development of a new proteomic field: lipoproteomics. Much further investigation in this field is warranted, particularly because newly discovered LDL and HDL proteins may play hitherto unknown role(s) in inflammatory reactions of the arterial wall and evolve as useful biomarkers in cardiovascular disease.

Ort, förlag, år, upplaga, sidor
Institutionen för molekylär och klinisk medicin, 2007
Serie
Linköping University Medical Dissertations, ISSN 0345-0082 ; 986
Nyckelord
LDL, HDL, Proteomik, Atheroskleros, Masspektrometri, 2-DE
Nationell ämneskategori
Cell- och molekylärbiologi
Identifikatorer
urn:nbn:se:liu:diva-8527 (URN)978-91-85715-47-3 (ISBN)
Disputation
2007-03-29, Aulan, Hälsans Hus, Campus US, Linköpings Universitet, Linköping, 09:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2007-03-15 Skapad: 2007-03-15 Senast uppdaterad: 2018-01-13

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Ghafouri, BijarKarlsson, HelenLewander, AndreasTagesson, ChristerLindahl, Mats

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