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Phage-Display-Derived Peptide Specific to Carbamylated Protein.

ABSTRACT: Protein carbamylation has been linked with diseases commonly associated with patients with reduced kidney function. Carbamylated human serum albumin (cHSA), which has been proven to be nephrotoxic and associated with heart failure for chronic kidney disease (CKD) patients, was chosen for our study. Through phage display against cHSA, one specific peptide sequence (cH2-p1) was identified with higher selectivity toward cHSA over native HSA. The cH2-p1 peptide was synthesized, and its target binding was analyzed through isothermal titration calorimetry (ITC). The result showed that cH2-p1 was able to bind cHSA of different levels of carbamylation with a similar dissociation constant of ?1.0 × 10^-4 M. This peptide also showed a binding specificity to carbamylated fibrinogen (cFgn), while not binding to native Fgn at all. For better understanding of the binding mechanism of cH2-p1, competitive binding of cH2-p1 and anti-homocitrulline to cHSA was performed, and the result revealed that cH2-p1 may bind to homocitrulline residues in a similar manner to the antibody. A molecular docking study was further performed to investigate the favored binding conformation of homocitrulline residue to cH2-p1. This work demonstrates the potential of peptides as a specific binding element to carbamylated proteins.

SUBMITTER: Ma Y

PROVIDER: S-EPMC7860060 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature

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Phage-Display-Derived Peptide Specific to Carbamylated Protein.

Ma Yuhao Y Wu Meng M Li Shuhui S Tonelli Marcello M Unsworth Larry D LD

ACS omega 20210125 4

Protein carbamylation has been linked with diseases commonly associated with patients with reduced kidney function. Carbamylated human serum albumin (cHSA), which has been proven to be nephrotoxic and associated with heart failure for chronic kidney disease (CKD) patients, was chosen for our study. Through phage display against cHSA, one specific peptide sequence (cH2-p1) was identified with higher selectivity toward cHSA over native HSA. The cH2-p1 peptide was synthesized, and its target bindin ...[more]

PMID: 33553925

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Project description:PURPOSE:Osteosarcoma represents the most common malignant primary bone tumor in childhood; however, the survival rate has remained unchanged for the past 20 years. To improve existing diagnosis and treatment methods and broaden the spectrum of imaging agents that can be used for early detection and assessment of tumor response to therapy, we performed a phage display-based screening for peptide sequences that bind specifically to osteosarcoma cells. EXPERIMENTAL DESIGN:From the Ph.D.-12 phage display peptide library composed of 2.7 x 10(9) different displayed peptides, one peptide was enriched after four rounds of in vitro selection in 143B osteosarcoma tumor cells with 293T human embryonic kidney cells as a control. Both the peptide and the phage clone displaying the peptide were conjugated with fluorescent dyes for in vitro cell and ex vivo tumor tissue stainings. The peptide was further labeled with (18)F for positron emission tomography imaging studies. Cell uptake and efflux and ex vivo biodistribution were also done with (18)F-labeled osteosarcoma specific peptide. RESULTS:ASGALSPSRLDT was the dominant sequence isolated from biopanning and named as OSP-1. OSP-1 shares a significant homology with heparinase II/III family protein, which binds and reacts with heparan sulfate proteoglycans. The fluorescence staining showed that FITC-OSP-1-phage or Cy5.5-OSP-1 had high binding with a panel of osteosarcoma cell lines, much less binding with UM-SCC1 human head and neck squamous cell carcinoma cells, and almost no binding with 293T cells, whereas the scrambled peptide OSP-S had virtually no binding to all the cell lines. (18)F-OSP-1 had significantly higher accumulation in 143B tumor cells both in vitro and in vivo than (18)F-OSP-S. (18)F-OSP-1 also had higher uptake in 143B tumors than in UM-SCC-1 tumors. CONCLUSIONS:Our data suggest that OSP-1 peptide is osteosarcoma specific, and the binding site of OSP-1 might be related to heparan sulfate proteoglycans. Appropriately labeled OSP-1 peptide has the potential to serve as a novel probe for osteosarcoma imaging.

Dataset Information

Phage-Display-Derived Peptide Specific to Carbamylated Protein.

Publications

Phage-Display-Derived Peptide Specific to Carbamylated Protein.

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