Abstract
The peptide-N 4-(N-acetyl-β-d-glucosaminyl) asparagine amidase F (PNGase F) catalyzes the cleavage of N-linked oligosaccharides between the innermost GlcNAc and asparagine residues of high mannose, hybrid and complex oligosaccharides from glycoproteins. The PNGase F has broad substrate specificity and thus is extensively used for the structural and functional studies of the glycoproteins. In this study, we tried to produce active recombinant PNGase F as secreted and intracellular-expressed forms using baculovirus expression vector system (BEVS) through silkworm larvae or cultured cells. PNGase F itself contains potential N-linked glycosylation sites and we found that it was N-glycosylated when PNGase F secreted from silkworm cells. Intriguingly, the secreted recombinant PNGase F has the lower catalytic activity and self-digests its N-linked glycans and therefore this secreted form of this enzyme produced from BEVS is not appropriate for carbohydrate chain analysis. Instead, we successfully mass-produced (2.1 mg/20 silkworm larvae) and purified active recombinant PNGase F as an intracellular protein without N-glycosylations. Besides, we confirmed by directed mutagenesis that several amino acid residues are crucial for the function of PNGase F. Our results provide an alternative method for the mass production of active enzymes involved in the study of glycoproteins.
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Acknowledgments
The NIAS-Bm-oyanagi2 cell line for propagation of recombinant BmNPVs was kindly provided by Dr. Imanihi (National Institute of Agrobiological Sciences, Japan). We also thank Dr. Chisa Aoki (Kyushu University Graduate School) for providing the Bme21 cell line for the expression of recombinant protein. The MALDI-TOF MS was kindly supported by Center for Advanced Instrumental and Educational Supports (Faculty of Agriculture, Kyushu University).
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Supplemental Fig. 1
Diagram of substrate specificities of PNGase F. The reaction results in release of the oligosaccharide and the aspartic acid-containing polypeptide. PNGase F is not able to cleave N-linked glycans from glycoproteins when the innermost GlcNAc residue is linked to an α(1-3) fucose residue. Black arrow represents the cleavage site of PNGase F. Gray circles: mannose, Black squares: GlcNAc, Black triangle: fucose, X: any sugar. Supplementary material 1 (JPEG 420 kb)
Supplemental Fig. 2
Comparison of the enzymatic activity of 30K-PNGase F before and after the self-digestion. 30K-PNGase F (self-digested) was generated by incubating 30K-PNGase F under the reaction condition at 37 °C for 1 h. 200 ng of 30K-PNGase F (with N-glycan) (lane 2, 3), 30K-PNGase F (self-digested) (lane 4, 5) and NoSP-PNGase F (lane 6, 7) which were incubated with denatured 15 μg fetuin (lane 3, 5, 7) at 37 °C for 1 h and that before the incubation (lane 2, 4, 6) were analyzed by CBB-stained 10 % SDS-PAGE. The arrows indicate the bands of rPNGase F. Mock (lane 1): fetuin without enzyme treatment. M: molecular mass markers. Supplementary material 2 (JPEG 525 kb)
Supplemental Fig. 3
Purification of rPNGase F by nickel affinity chromatography. The NoSP-PNGase F proteins purified from (a) the Bme21 cells, and (b) the silkworm fat bodies by nickel affinity chromatography. M molecular mass markers, IP input, FT flow-through, WS wash fraction, lanes 1–9 elution fractions by 500 mM imidazole. All samples were analyzed by Coomassie-stained 10 % SDS-PAGE, and the arrows indicate the bands of rPNGase F. Supplementary material 3 (JPEG 652 kb)
Supplemental Fig. 4
Structure of N-linked oligosaccharides of RNase B. The gray circles and black squares represent mannose and GlcNAc, respectively. Black arrow represents the cleavage site of PNGase F. Supplementary material 4 (JPEG 524 kb)
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Masuda, A., Xu, J., Mitsudome, T. et al. Mass Production of an Active Peptide-N-Glycosidase F Using Silkworm-Baculovirus Expression System. Mol Biotechnol 57, 735–745 (2015). https://doi.org/10.1007/s12033-015-9866-1
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DOI: https://doi.org/10.1007/s12033-015-9866-1