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3 protocols using ppicza vector

1

Cloning and Mutagenesis of Human Serum Albumin

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Total RNA from HepG2 cells was isolated using the RNeasy mini kit (QIAGEN) following manufacturer’s instructions. Retrotranscription was performed using 2.5 μg of RNA, a specific HSA oligonucleotide (ATAAGCCTAAGGCAGCTTGACTGG) and Superscript II reverse transcriptase (Invitrogen). The full-coding sequence of HSA was PCR- amplified with U-Taq (SBS GeneTech) and sense (CGCGAATTCATGAAGTGGGTAACC) and antisense (CGCCTCGAGTTATAAGCCTAAGGCAGC) primers containing EcoRI and XhoI restriction sites (underlined), respectively. The amplified product was cloned into a pGEM vector (Promega), sequenced and subcloned into pPICZA vector (Invitrogen). The propeptide sequence (AGGGGTGTGTTTCGTCGA) was deleted by PCR using primers flanking the target sequence (reverse GGAATAAGCCGAGCTAAAGAGAAAAAGAAGGG and forward GATGCACACAAGAGTGAGGTTGCTCATCGG) previously phosphorylated with T4 polynucleotide kinase T4-PNK (Thermo Scientific). T4 ligase (Thermo Scientific) was used to blunt end ligate the PCR product. Domain I (DomI) coding region was obtained from the last by PCR amplification using KAPA HiFi polymerase (Kapa Biosystems) and specific sense (CGCGAATTCATGAAGTGGGTAACC) and antisense (CGCCTCGAGTTATTTGGCAGACGAAGCCTT) primers containing EcoRI and XhoI restriction sites (underlined), respectively. Then it was subcloned back into pPICZA (pPICZA-DomI).
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2

Recombinant Human β-Actin Expression

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Homo sapiens ACTB cDNA cloned in the pGEM-T Easy Vector (#A1360, Promega) was modified by PCR using the sense primer (GGT ACC ATG CAC CAT CAC CA TCA CCA TGA AAA CCT GTA CTT CCA ATC CAT GGA TGA TGA TAT CGC CGC G) that contains one KpnI restriction site (underlined) and a start codon followed by a 6x histidine-encoding sequence and TEV protease cleavage site; and the AgeI-containing antisense primer ACCGGTCTAGAAGCATTTGCGGTGGAC. The corresponding PCR product was digested with KpnI/AgeI and subcloned in the pPICZA vector (#V19020, Invitrogen) for expression of 6xHis-tagged human β-actin in Pichia pastoris yeast. DNA sequencing of the human ACTB construct in pPICZA (pPICZA/h-β -actin) was performed.
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3

Heterologous Protein Expression in Pichia pastoris

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Pichia pastoris X-33 strain, the EasySelect™ Pichia expression Kit and pPICZA vector were purchased from Invitrogen (Carlsbad, CA). Restriction enzymes were purchased from New England Biolabs (Ipswich, Massachusetts, USA). All chemicals were of the highest purity grade available and were purchased from Sigma-Aldrich (St. Louis, MO, USA) unless stated differently. Methanol and microcrystalline cellulose (MCC) were purchased from Merck (Kenilworth NJ, EEUU), carboxymethylcellulose sodium salt (CMC) with a degree of substitution of 0.60–0.95 was purchased from Fluka (Buchs, Switzerland), xylan (Carl Roth, Karlsruhe, Germany), glucomannan, lichenan, barley β-glucan, cellotriose, cellotetraose, cellopentaose and cellohexaose were purchased from Megazyme (Wicklow, Ireland). Kobe Agar-agar and yeast extract were purchased from Carl Roth and yeast nitrogenous base without amino acids (YNB) was obtained from VWR chemicals (Radnor, Pensylvania, USA). Phosphoric acid swollen cellulose (PASC) was prepared from MCC as described previously [19 (link)].
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