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Mass spectrometrical analysis of the processed metastasis-inducing anterior gradient protein 2 homolog reveals 100% sequence coverage

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Summary.

Anterior gradient protein 2 homolog is a metastasis-inducing protein in a rat model of rat breast cancer and prognostic for outcome in hormonally treated breast cancer patients. Carrying out protein profiling in several mammalian cells and tissues, we detected this protein (synonym: secreted cement gland protein XAG-2 homolog) that was originally described in toad skin, in human bronchial epithelia.

Tissues obtained from biopsies were homogenised and extracted proteins were run on two-dimensional gel electrophoresis. Following in-gel digestion with proteases trypsin, AspN, LysC and chymotrypsin, mass spectrometrical analysis was carried out by MALDI-TOF/TOF.

The use of MS following multi-enzyme digestion of the protein resulted into 100% sequence coverage. MS/MS analysis enabled sequencing of 87% of the protein structure. This percentage does not include the signal peptide that was not observed in our protein due to processing. No posttranslational modifications were detectable and no sequence conflicts were observed.

Complete analysis, unambiguous identification and characterisation of this biologically important protein could be shown, which is relevant for the definition of a marker protein that has been described so far by immunochemical methods only. Complete analysis is of importance as it forms the basis for all future work on this protein and, moreover, may serve as an analytical tool for further studies.

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Authors and Affiliations

  1. Department of Pediatrics, Medical University of Vienna, Vienna, Austria

    J.-K. Myung, T. Frischer, L. Afjehi-Sadat, A. Pollak & G. Lubec

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  1. J.-K. Myung
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  2. T. Frischer
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  3. L. Afjehi-Sadat
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  4. A. Pollak
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  5. G. Lubec
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Authors’ address: Prof. Dr. Gert Lubec, Department of Pediatrics, Medical University of Vienna, Währinger Gürtel 18, A-1090 Vienna, Austria

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Myung, JK., Frischer, T., Afjehi-Sadat, L. et al. Mass spectrometrical analysis of the processed metastasis-inducing anterior gradient protein 2 homolog reveals 100% sequence coverage. Amino Acids 35, 485–494 (2008). https://doi.org/10.1007/s00726-007-0551-y

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  • DOI: https://doi.org/10.1007/s00726-007-0551-y

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