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Tryptone is a complex mixture of peptides and amino acids derived from the enzymatic digestion of casein. It is commonly used as a source of nitrogen, carbon, and other nutrients in microbiological growth media, supporting the growth of a variety of microorganisms. Tryptone provides essential nutrients for the cultivation of bacteria, fungi, and other microbes in laboratory settings.

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4 protocols using tryptone

1

Protein Expression and Purification Protocol

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All organic solvents (methanol, ethanol, acetone, dimethyl formamide (DMF) and, N,N-diisopropylethylamine (DIPEA)) were HPLC grade (Fisher Scientific) and used without further purification. E. coli cells (BL21 and NEB 5-alpha) were purchased from New England Biolabs. Lysozyme and Sephadex LH-20 were purchased from Sigma-Aldrich. BLUEStain protein ladder and ampicillin were purchased from Gold Biotechnology. Yeast extract, L-proline, tryptone, glycerol, and other bacterial culture media components were purchased from Research Products International. All materials for SDS-PAGE were obtained from Bio-Rad. PE/Cyanine7 anti-human EGFR antibody was purchased from BioLegend. Cy5.5 NHS ester was obtained from Lumi Probe. DMEM/F12, DMEM, fetal bovine serum (FBS), PenStrep, and other cell culture reagents were obtained from Corning Life Sciences.
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2

Preparation of Tryptophan-Containing Biomolecules

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Tryptone was purchased from Research Products International, general laboratory chemicals and supplies were obtained from Sigma/Aldrich and the NMR shift reagent Fmoc-Trp(Boc)-OH was obtained from Sigma/Aldrich. Vivaspin columns (10 kD) were purchased from GE Healthcare.
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3

Purification and Characterization of Protein

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We purchased yeast extract, sodium chloride, LB broth (Miller), potassium phosphate monobasic and dibasic, tris base, tetracycline hydrochloride, magnesium sulfate heptahydrate, imidazole, (4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid) (HEPES), and premade 1 M HEPES buffer (pH 7.3) from Fisher; Triton X-100, tris(2-carboxyethyl)phosphine (TCEP), phenylmethylsulfonyl fluoride (PMSF), bovine serum albumin (BSA), p-nitrophenyl phosphate disodium salt hexahydrate (pNPP), and dimethyl sulfoxide (DMSO) from MilliporeSigma; Phusion and DNase I from New England Biolabs; agar and M9 salts from Becton Dickinson; glucose and Nalpha-4-tosyl-L-arginine methyl ester hydrochloride (TAME) from Acros Organics; tryptone from Research Products International; isopropyl βd-1-thiogalactopyranoside (IPTG) from ChemCruz; kanamycin sulfate from IBI Scientific; carbenicillin from Gemini Bioproducts; lysozyme from Alfa Aesar; 10 kDa spin columns from Sartorius; 4–20% criterion TGX stain-free protein gels from Bio-Rad; and HisTrap and HiTrap columns from GE Healthcare.
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4

Purification and Characterization of StsA

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Materials and reagents were purchased from
Gold Biotechnology, Fisher Scientific, or Sigma-Aldrich unless otherwise
noted. Yeast extract and tryptone were purchased from Research Products
International. Molecular biology reagents for cloning (e.g., restriction
enzymes, Q5 polymerase, T4 DNA ligase, and deoxynucleotides) were
purchased from New England Biolabs. Oligonucleotide primers and gene
blocks were obtained from Integrated DNA Technologies. DNA spin columns
were purchased from Epoch Life Sciences. Sanger sequencing was performed
by the Roy J. Carver Biotechnology Center (University of Illinois
at Urbana-Champaign). Polymerase chain reactions were performed using
a Bio-Rad S1000 thermal cycler. Escherichia coli DH5α and BL21(DE3) strains were used for plasmid maintenance
and protein overexpression, respectively. Expressed StsA was purified
using an Agilent 1200 series HPLC fitted with a 10 × 250 mm C18
column (Macherey Nagel). Mass spectroscopy was performed using a Bruker
Daltonics UltrafleXtreme MALDI-TOF mass spectrometer and a ThermoFisher
Scientific Orbitrap Fusion ESI-MS using an Advion TriVersa Nanomate
100.
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