A Multiple N-Glucosylated Peptide Epitope Efficiently Detecting Antibodies in Multiple Sclerosis
Abstract
:1. Introduction
2. Materials and Methods
2.1. Synthesis of the N-Glc Peptides
2.2. Synthesis of N-Glc Multiple Epitope Peptides (N-Glc MEPs)
2.3. Immunological Assays
2.3.1. Inhibition ELISA
2.3.2. Solid-Phase ELISA (SP-ELISA)
2.4. Statistical Analysis
3. Results
3.1. Antibody Detection in Solid-Phase ELISA (SP-ELISA) Is Affected by the Length of the Peptide Antigen
3.2. Antibody Affinity of Shortened CSF114(Glc) Glucopeptide Sequences in Competitive ELISA: Shortening CSF114(Glc) Does not Affect Antibody Epitope Recognition
3.3. Study of the Possible Role of a Consensus Sequence Surrounding N(Glc) in Antibody Recognition
3.4. N-Glc Multiple Epitope Peptides (N-Glc MEPs) to Mimic Multivalency in SP-ELISA
4. Discussion
5. Conclusions
Supplementary Materials
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Peptide Name Number | N-Glucosylated Peptide Sequence |
---|---|
CSF114(Glc) (1) | TPRVERN(Glc)GHSVFLAPYGWMVK |
[Asn7(Glc)] CSF114(1–18) (2) | Ac-TPRVERN(Glc)GHSVFLAPYGW-NH2 |
[Asn7(Glc)] CSF114(1–16) (3) | Ac-TPRVERN(Glc)GHSVFLAPY-NH2 |
[Asn7(Glc)] CSF114(1–14) (4) | Ac-TPRVERN(Glc)GHSVFLA-NH2 |
[Asn7(Glc)] CSF114(2–13) (5) | Ac-PRVERN(Glc)GHSVFL-NH2 |
[Asn7(Glc)] CSF114(4–11) (6) | Ac-VERN(Glc)GHSV-NH2 |
[Asn7(Glc)] CSF114(5–10) (7) | Ac-ERN(Glc)GHS-NH2 |
[Asn7(Glc)] CSF114(6–9) (8) | Ac-RN(Glc)GH-NH2 |
Glucosylated Core Peptide | Glucosylated Tripeptides | Glucosylated Pentapeptides |
---|---|---|
Selected NXT/S sequences | Ac-N(Glc)GS-NH2 (9); Ac-N(Glc)GT-NH2 (10); Ac-N(Glc)KS-NH2 (11); Ac-N(Glc)KT-NH2 (12). | Ac-ERN(Glc)GS-NH2 (16); Ac-ERN(Glc)GT-NH2 (17); Ac-ERN(Glc)KS-NH2 (18); Ac-ERN(Glc)KT-NH2 (19) |
CSF114(Glc) | Ac-N(Glc)GH-NH2 (13); Ac-N(Glc)KH-NH2 (14) | Ac-ERN(Glc)GH-NH2 (20); Ac-ERN(Glc)KH-NH2 (21) |
[Asn31(Glc)]hMOG(30–50) | Ac-N(Glc)AT-NH2 (15) | Ac-KGN(Glc)AT-NH2 (22) |
Compound | Area Under Curve (AUC) | Criterion Value and Coordinates | ||||||
---|---|---|---|---|---|---|---|---|
AUC | Standard Error (SE) | 95% Confidence Interval | p-Value | Cut-Off | Sensitivity (%) | Specificity (%) | Likelihood Ratio | |
N-Glc MEP (23) | 0.5747 | 0.1073 | 0.3643 to 0.7850 | 0.4899 | >1.057 | 17.65 (3.799 to 43.43) | 92.31 (63.97 to 99.81) | 2.294 |
N-Glc MEP (24) | 0.5249 | 0.1100 | 0.3092 to 0.7406 | 0.8180 | >0.6104 | 35.29 (14.21 to 61.67) | 92.31 (63.97 to 99.81) | 4.588 |
N-Glc MEP (25) | 0.7511 | 0.09376 | 0.5673 to 0.9350 | 0.02023 | >1.053 | 38.46 (13.86 to 68.42) | 82.35 (56.57 to 96.20) | 2.179 |
N-Glc MEP (26) | 0.6380 | 0.1041 | 0.4339 to 0.8421 | 0.2018 | >1.029 | 30.77 (9.092 to 61.43) | 82.35 (56.57 to 96.20) | 1.744 |
CSF114(Glc) (1) | 0.6516 | 0.1049 | 0.4458 to 0.8573 | 0.1610 | >0.7575 | 47.06 (22.98 to 72.19) | 92.31 (63.97 to 99.81) | 6.118 |
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Nuti, F.; Fernandez, F.R.; Sabatino, G.; Peroni, E.; Mulinacci, B.; Paolini, I.; Pisa, M.D.; Tiberi, C.; Lolli, F.; Petruzzo, M.; et al. A Multiple N-Glucosylated Peptide Epitope Efficiently Detecting Antibodies in Multiple Sclerosis. Brain Sci. 2020, 10, 453. https://0-doi-org.brum.beds.ac.uk/10.3390/brainsci10070453
Nuti F, Fernandez FR, Sabatino G, Peroni E, Mulinacci B, Paolini I, Pisa MD, Tiberi C, Lolli F, Petruzzo M, et al. A Multiple N-Glucosylated Peptide Epitope Efficiently Detecting Antibodies in Multiple Sclerosis. Brain Sciences. 2020; 10(7):453. https://0-doi-org.brum.beds.ac.uk/10.3390/brainsci10070453
Chicago/Turabian StyleNuti, Francesca, Feliciana Real Fernandez, Giuseppina Sabatino, Elisa Peroni, Barbara Mulinacci, Ilaria Paolini, Margherita Di Pisa, Caterina Tiberi, Francesco Lolli, Martina Petruzzo, and et al. 2020. "A Multiple N-Glucosylated Peptide Epitope Efficiently Detecting Antibodies in Multiple Sclerosis" Brain Sciences 10, no. 7: 453. https://0-doi-org.brum.beds.ac.uk/10.3390/brainsci10070453