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3 protocols using tris 2 carboxyethyl phosphine hydrochloride

1

Purity and Synthesis of Cofactors

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N-(2-Hydroxyethyl)-piperazine-N′-(2-ethanesulfonic acid) (HEPES) was purchased
from Fisher Scientific. Imidazole was purchased from J. T. Baker Chemical
Co. Potassium chloride and glycerol were purchased from EMD Chemicals.
β-Mercaptoethanol (BME), sodium dithionite, sodium sulfide,
5′-deoxyadenosine (5′-dAH), and S-adenosylhomocysteine
(SAH) were purchased from MilliporeSigma. Kanamycin, ampicillin, dithiothreitol
(DTT), arabinose, isopropyl β-d-1-thiogalactopyranoside
(IPTG) and tris(2-carboxyethyl)phosphine hydrochloride (TCEP) were
purchased from Gold Biotechnology. Ni-nitrilotriacetic acid (NTA)
resin was acquired from Qiagen. SAM was synthesized and purified as
described previously.45 (link) DNA isolation kits
were purchased from Macherey-Nagel (Dueren, Germany). All other chemicals
and materials were of the highest grade available and were from MilliporeSigma.
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2

Bacterial Growth Media Protocols

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Tryptic Soy Broth (TSB, Becton, Dickinson) was used as rich medium for
Staphylococcus aureus strains. Nutrient broth (NB) (Difco)
supplemented with NaCl (85 mM) was used as rich medium for Salmonella
enterica
strains. No-carbon Essential (NCE) minimal medium (Berkowitz et al., 1968 (link))
supplemented with trace minerals (Balch &
Wolfe, 1976
), L-methionine (100 μM), and magnesium sulfate (1
mM) was used to grow S. enterica strains. When present in the
medium, acetate was at 10 mM. All strains were grown at 37 ºC with
shaking (180 rpm). When added to the medium, antibiotics were present at the
following concentrations: ampicillin (Fisher Scientific), 100 μg
ml−1; chloramphenicol (Sigma), 10 μg
ml-1. 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid (HEPES)
buffer, tris(2-carboxyethyl)phosphine hydrochloride (TCEP),
isopropyl-β-D-1-thiogalactopyranoside (IPTG), dithiothreitol (DTT) were
purchased from Gold BioTechnology; L-(+)-arabinose was purchased from Sigma.
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3

Purification of Recombinant GPIbα LBD

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Recombinant human GPIbα ligand-binding domain (LBD) proteins were expressed and purified as described previously. 5, 6 DNA primers were supplied by Integrated DNA Technologies (Coralville, IA); cell culture dishes and flasks were from Corning (Corning, NY); ristocetin was purchased from MP Biomedicals (Santa Ana, CA); bovine serum albumin and guanidine hydrochloride were from Millipore-Sigma (Burlington, MA); and Tris (2carboxyethyl) phosphine hydrochloride was from GoldBio (St. Louis, MO).
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