Fingerprinting desmosine-containing elastin peptides
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Fingerprinting desmosine-containing elastin peptides. / Schräder, Christoph U; Heinz, Andrea; Majovsky, Petra; Schmelzer, Christian E H.
In: Journal of the American Society for Mass Spectrometry, Vol. 26, No. 5, 05.2015, p. 762-73.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Fingerprinting desmosine-containing elastin peptides
AU - Schräder, Christoph U
AU - Heinz, Andrea
AU - Majovsky, Petra
AU - Schmelzer, Christian E H
PY - 2015/5
Y1 - 2015/5
N2 - Elastin is a vital protein of the extracellular matrix of jawed vertebrates and provides elasticity to numerous tissues. It is secreted in the form of its soluble precursor tropoelastin, which is subsequently cross-linked in the course of the elastic fiber assembly. The process involves the formation of the two tetrafunctional amino acids desmosine (DES) and isodesmosine (IDES), which are unique to elastin. The resulting high degree of cross-linking confers remarkable properties, including mechanical integrity, insolubility, and long-term stability to the protein. These characteristics hinder the structural elucidation of mature elastin. However, MS(2) data of linear and cross-linked peptides released by proteolysis can provide indirect insights into the structure of elastin. In this study, we performed energy-resolved collision-induced dissociation experiments of DES, IDES, their derivatives, and DES-/IDES-containing peptides to determine characteristic product ions. It was found that all investigated compounds yielded the same product ion clusters at elevated collision energies. Elemental composition determination using the exact masses of these ions revealed molecular formulas of the type CxHyN, suggesting that the pyridinium core of DES/IDES remains intact even at relatively high collision energies. The finding of these specific product ions enabled the development of a similarity-based scoring algorithm that was successfully applied on LC-MS/MS data of bovine elastin digests for the identification of DES-/IDES-cross-linked peptides. This approach facilitates the straightforward investigation of native cross-links in elastin.
AB - Elastin is a vital protein of the extracellular matrix of jawed vertebrates and provides elasticity to numerous tissues. It is secreted in the form of its soluble precursor tropoelastin, which is subsequently cross-linked in the course of the elastic fiber assembly. The process involves the formation of the two tetrafunctional amino acids desmosine (DES) and isodesmosine (IDES), which are unique to elastin. The resulting high degree of cross-linking confers remarkable properties, including mechanical integrity, insolubility, and long-term stability to the protein. These characteristics hinder the structural elucidation of mature elastin. However, MS(2) data of linear and cross-linked peptides released by proteolysis can provide indirect insights into the structure of elastin. In this study, we performed energy-resolved collision-induced dissociation experiments of DES, IDES, their derivatives, and DES-/IDES-containing peptides to determine characteristic product ions. It was found that all investigated compounds yielded the same product ion clusters at elevated collision energies. Elemental composition determination using the exact masses of these ions revealed molecular formulas of the type CxHyN, suggesting that the pyridinium core of DES/IDES remains intact even at relatively high collision energies. The finding of these specific product ions enabled the development of a similarity-based scoring algorithm that was successfully applied on LC-MS/MS data of bovine elastin digests for the identification of DES-/IDES-cross-linked peptides. This approach facilitates the straightforward investigation of native cross-links in elastin.
KW - Animals
KW - Cattle
KW - Chromatography, High Pressure Liquid
KW - Cross-Linking Reagents
KW - Desmosine
KW - Elastin
KW - Humans
KW - Isodesmosine
KW - Models, Molecular
KW - Molecular Structure
KW - Molecular Weight
KW - Oligopeptides
KW - Peptide Fragments
KW - Peptide Mapping
KW - Protein Stability
KW - Proteolysis
KW - Spectrometry, Mass, Electrospray Ionization
KW - Stereoisomerism
KW - Tandem Mass Spectrometry
KW - Tropoelastin
KW - Journal Article
KW - Research Support, Non-U.S. Gov't
U2 - 10.1007/s13361-014-1075-9
DO - 10.1007/s13361-014-1075-9
M3 - Journal article
C2 - 25604393
VL - 26
SP - 762
EP - 773
JO - Journal of The American Society for Mass Spectrometry
JF - Journal of The American Society for Mass Spectrometry
SN - 1044-0305
IS - 5
ER -
ID: 186421960