2003
DOI: 10.1021/pr0340173
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Proteomic Analysis of the Site Specificity of Glycation and Carboxymethylation of Ribonuclease

Abstract: Proteomic analysis using electrospray liquid chromatography-mass spectrometry (ESI-LC-MS) has been used to compare the sites of glycation (Amadori adduct formation) and carboxymethylation of RNase and to assess the role of the Amadori adduct in the formation of the advanced glycation end-product (AGE), N(epsilon)-(carboxymethyl)lysine (CML). RNase (13.7 mg/mL, 1 mM) was incubated with glucose (0.4 M) at 37 degrees C for 14 days in phosphate buffer (0.2 M, pH 7.4) under air. On the basis of ESI-LC-MS of tryptic… Show more

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Cited by 78 publications
(104 citation statements)
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“…The recovered protein was reduced with DTT, derivatized with 4-vinylpyridine, and digested with trypsin (enzyme:substrate ratio of 5:100 (w/w)) at 37°C for 5 h. All samples were prepared in triplicate. The procedures have been published in detail elsewhere (11).…”
Section: Modification Of Protein By Glucose or Glyoxal And Preparatiomentioning
confidence: 99%
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“…The recovered protein was reduced with DTT, derivatized with 4-vinylpyridine, and digested with trypsin (enzyme:substrate ratio of 5:100 (w/w)) at 37°C for 5 h. All samples were prepared in triplicate. The procedures have been published in detail elsewhere (11).…”
Section: Modification Of Protein By Glucose or Glyoxal And Preparatiomentioning
confidence: 99%
“…Control incubations used phosphate buffer in place of HA solution. Further aliquots of the 7-day RNase-1 mM glyoxal incubation (40 l) were ultrafiltrated to remove any unreacted glyoxal (11), resuspended in an equivalent volume of 0.4 M, pH 7.4 phosphate buffer (40 l) containing DTPA (final concentration 0.1 mM) and incubated for 1 and 7 days.…”
Section: Modification Of Protein By Glucose or Glyoxal And Preparatiomentioning
confidence: 99%
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“…Tryptic digestion of RNase was performed as described previously [8]. Briefly, RNase (1 mg) was suspended in 75 μl of MOPS buffer (100 mM, pH 7.2) containing urea (6 M) and EDTA (1 mM).…”
Section: Tryptic Digestionmentioning
confidence: 99%
“…Quantification of peptides was performed with the Quattro set in full scan mode (200 -1800 amu), and masses of interest were extracted using MassLynx (Micromass) software. Fractional modification of Met-containing peptides was calculated as described previously [8]. Briefly, relative amounts of unmodified peptides were determined by summing the peak areas of all charged forms of the peptide of interest and dividing by the sum of the peak areas of the charged forms of an internal reference peptide in RNase, H 105 -V 124 .…”
Section: Liquid Chromatography-mass Spectrometry (Lc-ms) and Lc/ms/msmentioning
confidence: 99%