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High-level expression and characterization of a secreted recombinant cation-dependent mannose 6-phosphate receptor in Pichia pastoris


High-level expression and characterization of a secreted recombinant cation-dependent mannose 6-phosphate receptor in Pichia pastoris



Protein Expression and Purification 26(2): 290-300



ISSN/ISBN: 1046-5928

PMID: 12406684

DOI: 10.1016/s1046-5928(02)00542-9

Mannose 6-phosphate receptors (MPRs) form essential components of the lysosomal enzyme targeting system by binding newly synthesized acid hydrolases with high (nM) affinity. We report the use of Pichia pastoris as a host to efficiently express the extracytoplasmic ligand-binding domain of the cation-dependent mannose 6-phosphate receptor. A truncated and glycosylation-deficient form of the receptor AF-Asn(81)/Stop(155) was secreted into the culture medium, yielding approximately 28mg/L after purification, which is an improvement of 10-100-fold compared to expression in baculovirus-infected insect cells and mammalian cells, respectively. Enzymatic deglycosylation indicated high-mannose sugars at the single potential glycosylation site of Asn 81. The extent and heterogeneity of N-glycans were revealed by applying matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS). In the case of AF-Asn(81)/Stop(155), the majority (75%) of the oligosaccharides contained chain lengths of Man(8-10)GlcNAc(2) while Man(11-12)GlcNAc(2) comprised the remaining (25%) N-linked sugars. A comparative MALDI-TOF spectra of Asn(81)/Stop(155) purified from insect cells indicated that Man(2-3)GlcNAc(2) and GlcNAcMan(2-3)GlcNAc(2) share the oligosaccharide pool. The receptor isolated from yeast was functional with respect to ligand binding and acid-dependent dissociation properties, as determined by pentamannosyl phosphate-agarose affinity chromatography. In addition, the protein was biochemically and functionally similar to Asn(81)/Stop(155) expressed in insect cells concerning its oligomeric state and binding affinity to the lysosomal enzyme, beta-glucuronidase (K(d)=1.4nM). These results demonstrate that P. pastoris is a convenient system for the production of large quantities of functional recombinant MPRs suitable for structure-function studies.

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