pET30a-β4

Protocol tips

Upstream tips	Protocol tips	Downstream tips
	The pET30a-α9 and pET30a-β4 were finally transformed into competent BL21 (DE3) cells (Tiangen, China) using the heat shock method. The positive clones were selected and cultured in 2 L LB medium containing 50 μg/mL kanamycin until the mid-log phase. Expression was induced with 1 mM isopropyl-1-thio-β-D-galactopyranoside (IPTG) for 6 h at 37 °C/200 rpm.	The cells were harvested at 8000 × g for 15 min, and the pellet was washed with phosphate buffer saline (PBS). The cells were centrifuged again and resuspended in lysis buffer (50 mM Tris-HCl, 300 mM NaCl, 10 mM imidazole, 0.5 mM PMSF, 0.1% Triton X-100, pH 7.4), disrupted by sonication. The inclusion bodies were collected by centrifugation at 12,000 × g, 4 °C for 20 min.

Protocol tips
The pET30a-α9 and pET30a-β4 were finally transformed into competent BL21 (DE3) cells (Tiangen, China) using the heat shock method. The positive clones were selected and cultured in 2 L LB medium containing 50 μg/mL kanamycin until the mid-log phase. Expression was induced with 1 mM isopropyl-1-thio-β-D-galactopyranoside (IPTG) for 6 h at 37 °C/200 rpm.
Downstream tips
The cells were harvested at 8000 × g for 15 min, and the pellet was washed with phosphate buffer saline (PBS). The cells were centrifuged again and resuspended in lysis buffer (50 mM Tris-HCl, 300 mM NaCl, 10 mM imidazole, 0.5 mM PMSF, 0.1% Triton X-100, pH 7.4), disrupted by sonication. The inclusion bodies were collected by centrifugation at 12,000 × g, 4 °C for 20 min.

Publication protocol

"The purified PCR fragments were directly cloned into the pMD19-T vector (Takara, Japan) for TA cloning using the Mighty TA-Cloning Kit (Takara, Japan) and transformed into competent Escherichia coli DH5α cells (Tiangen, China), which were incubated at 37 °C overnight on a Luria-Bertani (LB) plate containing 100 μg/mL ampicillin (Sigma, USA). A single clone from each construct was selected and sequenced to ensure sequence fidelity. The verified α9- and β4-tubulin sequences were cut from the pMD19-T construct by double enzyme digestion and directionally ligated into the pET30a(+) vector (Novagen, USA), which had previously been digested with the same enzymes. Then, plasmid constructs (pET30a-α9 and pET30a-β4) were confirmed by double enzyme digestion with corresponding enzymes.

The pET30a-α9 and pET30a-β4 were finally transformed into competent BL21 (DE3) cells (Tiangen, China) using the heat shock method. The positive clones were selected and cultured in 2 L LB medium containing 50 μg/mL kanamycin until the mid-log phase. Expression was induced with 1 mM isopropyl-1-thio-β-D-galactopyranoside (IPTG) for 6 h at 37 °C/200 rpm. The cells were harvested at 8000 × g for 15 min, and the pellet was washed with phosphate buffer saline (PBS). The cells were centrifuged again and resuspended in lysis buffer (50 mM Tris-HCl, 300 mM NaCl, 10 mM imidazole, 0.5 mM PMSF, 0.1% Triton X-100, pH 7.4), disrupted by sonication. The inclusion bodies were collected by centrifugation at 12,000 × g, 4 °C for 20 min."

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