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Sf 900 2 sfm medium

Manufactured by Thermo Fisher Scientific
Sourced in United States, Germany, United Kingdom

Sf-900 II SFM medium is a serum-free medium designed for the growth and maintenance of insect cells in suspension culture. It is a proprietary formulation that provides a chemically defined, protein-free, and low-lipid environment to support the optimal growth and productivity of insect cell lines.

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71 protocols using sf 900 2 sfm medium

1

Bacterial and Insect Cell Culture Protocols

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E. coli cells were cultured in LB medium (Sigma) at 37 °C. The E. coli strain Stellar cells were used to generate and amplify plasmids for SPNS2 mutations and strain DH10Bac cells were used to generate bacmids.
Sf9 insect cells (Thermo Fisher Scientific) were cultured in Sf-900 II SFM medium (GIBCO) at 27 °C. The baculovirus were generated and amplified in Sf9 cells in Sf-900 II SFM medium supplemented with 2% (v/v) fetal bovine serum (FBS) (GIBCO).
Expi293F suspension cells were cultured in Freestyle 293 expression medium (GIBCO) and grown in an orbital shaker at 37 °C and 8% CO2.
HEK293T cells were cultured in Dulbecco’s Modified Eagle’s Medium (DMEM) (GIBCO) supplemented with 10% FBS and grown in an incubator at 37 °C and 5% CO2.
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2

Bacterial and Insect Expression of Eukaryotic Protein Complexes

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Pab1 and PABPC1 full-length and truncation constructs were heterologously expressed in the E. coli expression strain Rosetta DE3. Not1(754-1000) was heterologously expressed in the E. coli expression strain BL21 DE3. Cells were grown to an OD600nm of 1.0 at 37°C in standard TB medium, the temperature reduced to 18°C and expression induced by the addition of IPTG at a final concentration of 250 μM. Cells were harvested 16 h post induction. Both yeast and human recombinant Pan2-Pan3 complexes as well as the core yeast Ccr4-Caf1 nucleases were expressed in the Trichoplusia ni Hi5 cell line. All Pan2-Pan3 complexes were subcloned in the pFL expression vector and co-expressed in insect cells using the Multibac method (Fitzgerald et al., 2006 (link)). The Ccr4(110-837)-Caf1(146-433) complex was expressed from the pFastBac DUAL vector (Invitrogen). Cells were transfected with recombinant Baculovirus variants carrying Pan2-Pan3 or Ccr4(110-837)-Caf1(146-433) coding sequences and grown for 48 to 60 h in Sf-900 II SFM Medium (Thermo Fisher Scientific) at 27°C. Recombinant Baculovirus generations were amplified in the Spodoptera frugiperda Sf21 cell line grown in Sf-900 II SFM Medium at 27°C.
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3

Nanoparticle Characterization Using DLS and PALS

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Mean hydrodynamic diameters (intensity-weighted average) and zeta potentials of the NP suspensions were measured in DI water or SF900 II SFM medium with a Zetasizer NanoZS (Malvern Instruments, Malvern, U.K.) using dynamic light scattering (DLS) or phase analysis light scattering (PALS), respectively. The Hückel approximation was used to estimate zeta potential from electrophoretic mobility. The nanoparticle suspensions were diluted down to a concentration of 10 μg mL−1 in DI water or in SF900 II SFM medium (Thermo Fisher Scientific, U.S.A.). We periodically analyze a polystyrene/latex standard reference material provided by Malvern to ensure the accuracy of PALS/DLS measurements. Additionally, we followed manufacturers recommended quality control included in the software package which evaluates goodness of fit of correlograms. The software also automatically adjusts the number of replicates to achieve the required precision.
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Cell Culture Conditions for HEK 293T, MDCK-SIAT1, and Sf9 Cells

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HEK 293T cells (human embryonic kidney cells, female) were maintained in DMEM medium (Thermo Fisher Scientific) supplemented with 10% fetal bovine serum (FBS, Thermo Fisher Scientific), 1x MEM non-essential amino acids (Thermo Fisher Scientific), and 100 U mL−1 of Penicillin-Streptomycin (Thermo Fisher Scientific). MDCK-SIAT1 cells (Madin-Darby canine hidney cells with stable expression of human 2,6-sialtransferase, female, Sigma-Aldrich) were maintained in DMEM medium supplemented with 10% FBS, 1x MEM non-essential amino acids, and 100 U mL−1 of Penicillin-Streptomycin. Sf9 cells (Spodoptera frugiperda ovarian cells, female, ATCC) were maintained in Sf-900 II SFM medium (Thermo Fisher Scientific).
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5

Protein Production in Eukaryotic and Bacterial Cells

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All bacterial and eukaryotic cell lines in this study were used for protein production for in vitro experiments, rather than being experimental models in the typical sense. They are listed in the key resources table.
Recombinant proteins were either cloned or synthesized as described in the method details. Spodoptera frugiperda 21 (Sf21) cells were maintained in Sf-900 II SFM medium (Thermo Fisher Scientific) at 27°C. Escherichia coli expression strains BL21 STAR pRARE (Thermo Fisher Scientific) were grown in TB medium at 37°C under antibiotic selection to an OD600nm = 2 before inducing protein expression by adding 500 μM IPTG for 16 h at 18°C. HEK 293T cells were adapted to grow in suspension and stable transfected using the piggyBac transposon system (Li et al., 2013 (link)). Cells were maintained in FreeStyle 293 Expression medium (Thermo Fisher Scientific) at 37°C and 5% CO2 and protein expression induced by adding 1 μg/mL doxycycline.
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6

Overexpressing HsLRRC8A in Sf9 Cells

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To overexpress HsLRRC8A for structural studies, recombinant baculovirus for HsLRRC8A was produced in Spodoptera frugiperda (Sf9) cells maintained in Sf-900 II SFM medium (Thermo Fisher Scientific) with 10% FBS (Thermo Fisher Scientific) and GlutaMAX (Thermo Fisher Scientific).
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7

Expression and Purification of DPAGT1 Protein

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The WT DPAGT1 cDNA sequence was cloned into the pFB-LIC-Bse expression vector (available from the SGC) with an N-terminal purification tag with a tobacco etch virus (TEV) protease cleavage site, and a 6x His purification sequence. Baculoviruses were produced by transformation of DH10Bac cells. Spodoptera frugiperda (Sf9) insect cells in Sf-900 II SFM medium (Thermo Fisher) were infected with recombinant baculovirus and incubated for 65 h at 27 °C in shaker flasks.
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8

Cell Culture Protocols for HEK293T, Expi293F, and Sf9

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HEK293T cells were cultured in Dulbecco’s modified Eagle’s medium (DMEM high glucose; Gibco) supplemented with 10% heat-inactivated fetal bovine serum (FBS; Gibco), 1% penicillin-streptomycin (Gibco), and 1× GlutaMax (Gibco). Cell passaging was performed every 3 to 4 days using 0.05% Trypsin-EDTA solution (Gibco). Expi293F cells were maintained in Expi293 Expression Medium (Thermo Fisher Scientific). Sf9 cells (Spodoptera frugiperda ovarian cells, female, ATCC) were maintained in Sf-900 II SFM medium (Thermo Fisher Scientific).
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9

Recombinant Protein Expression in Insect Cells

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Human UGGT1wt-Sep15 and Sep15 were expressed in Spodoptera frugiperda (Sf21) insect cells according to standard protocols for the Bac-to-Bac system (Thermo Fisher Scientific). Sf21 cells were typically grown in Sf-900 II SFM medium (Thermo Fisher Scientific) at 29 °C, and a high-titer recombinant baculovirus stock was used to infect 2×106 cells/mL. The cell culture medium containing secreted proteins was harvested 4 days after infection.
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10

Cell Culture Conditions for HEK 293T, MDCK-SIAT1, and Sf9 Cells

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HEK 293T cells (human embryonic kidney cells, female) were maintained in DMEM medium (Thermo Fisher Scientific) supplemented with 10% fetal bovine serum (FBS, Thermo Fisher Scientific), 1x MEM non-essential amino acids (Thermo Fisher Scientific), and 100 U mL−1 of Penicillin-Streptomycin (Thermo Fisher Scientific). MDCK-SIAT1 cells (Madin-Darby canine hidney cells with stable expression of human 2,6-sialtransferase, female, Sigma-Aldrich) were maintained in DMEM medium supplemented with 10% FBS, 1x MEM non-essential amino acids, and 100 U mL−1 of Penicillin-Streptomycin. Sf9 cells (Spodoptera frugiperda ovarian cells, female, ATCC) were maintained in Sf-900 II SFM medium (Thermo Fisher Scientific).
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