Monoclonal antibody RYSK173 recognizes the dinuclear Zn center of serum carnosinase 1 (CN-1): possible consequences of Zn binding for CN-1 recognition by RYSK173
Background and Aims The proportion of serum carnosinase (CN-1) recognized by RYSK173 monoclonal antibody negatively correlates with CN-1 activity. We thus hypothesized that the epitope recognized by RYSK173 is accessible only in a catalytically incompetent conformation of the zinc dependent enzyme a...
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| Hauptverfasser: | , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
January 22, 2016
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| In: |
PLOS ONE
Year: 2016, Jahrgang: 11, Heft: 1, Pages: 1-12 |
| ISSN: | 1932-6203 |
| DOI: | 10.1371/journal.pone.0146831 |
| Online-Zugang: | Verlag, Volltext: http://dx.doi.org/10.1371/journal.pone.0146831 Verlag, Volltext: https://journals-plos-org.ezproxy.medma.uni-heidelberg.de/plosone/article?id=10.1371/journal.pone.0146831 
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| Verfasserangaben: | Shiqi Zhang, Holger A. Lindner, Sarah Kabtni, Jaap van den Born, Stephan Bakker, Gerjan Navis, Bernard Krämer, Benito Yard, Sibylle Hauske |
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| 245 | 1 | 0 | |a Monoclonal antibody RYSK173 recognizes the dinuclear Zn center of serum carnosinase 1 (CN-1) |b possible consequences of Zn binding for CN-1 recognition by RYSK173 |c Shiqi Zhang, Holger A. Lindner, Sarah Kabtni, Jaap van den Born, Stephan Bakker, Gerjan Navis, Bernard Krämer, Benito Yard, Sibylle Hauske |
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| 520 | |a Background and Aims The proportion of serum carnosinase (CN-1) recognized by RYSK173 monoclonal antibody negatively correlates with CN-1 activity. We thus hypothesized that the epitope recognized by RYSK173 is accessible only in a catalytically incompetent conformation of the zinc dependent enzyme and we mapped its position in the CN-1 structure. Since patients with kidney failure are often deficient in zinc and other trace elements we also assessed the RYSK173 CN-1 proportion in serum of these patients and studied the influence of hemodialysis hereon in relation to Zn2+ and Cu2+ concentration during hemodialysis. Methods and Results Epitope mapping using myc-tagged CN-1 fragments and overlapping peptides revealed that the RYSK173 epitope directly contributes to the formation of the dinuclear Zn center in the catalytic domain of homodimeric CN-1. Binding of RYSK173 to CN-1 was however not influenced by addition of Zn2+ or Cu2+ to serum. In serum of healthy controls the proportion of CN-1 recognized by RYSK173 was significantly lower compared to end-stage renal disease (ESRD) patients (1.12 ± 0.17 vs. 1.56 ± 0.40% of total CN-1; p<0.001). During hemodialysis the relative proportion of RYSK173 CN-1 decreased in parallel with increased serum Zn2+ and Cu2+ concentrations after dialysis. Conclusions Our study clearly indicates that RYSK173 recognizes a sequence within the transition metal binding site of CN-1, thus supporting our hypothesis that metal binding to CN-1 masks the epitope. The CN-1 RYSK173 proportion appears overall increased in ESRD patients, yet it decreases during hemodialysis possibly as a consequence of a relative increase in transition metal bound enzyme. | ||
| 650 | 4 | |a Chronic kidney disease | |
| 650 | 4 | |a Enzyme-linked immunoassays | |
| 650 | 4 | |a Epitope mapping | |
| 650 | 4 | |a Medical dialysis | |
| 650 | 4 | |a Monoclonal antibodies | |
| 650 | 4 | |a Recombinant proteins | |
| 650 | 4 | |a Synthetic peptides | |
| 650 | 4 | |a Zinc | |
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