Biochemistry
Biochemistry
9th Edition
ISBN: 9781319114671
Author: Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher: W. H. Freeman
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You have a crude lysate sample (CL) containing a mixture of six proteins (1, 2, 3, 4, 5, ẞ- galactosidase), and your goal is to obtain purified ẞ-gal. Some characteristics of these
proteins are shown in the table below.
Protein
Alcohol dehydrogenase
Carbonic anhydrase
Insulin B chain
Phosphorylase B
Glutamic dehydrogenase
B-galactosidase
45%
Concentration of ammonium sulfate
(AS) required for precipitation
Molecular Weight (kDa)
Isoelectric point (pl)
38
3.7
80%
65%
20%
30%
45%
28
4.8
4
5.3
98
6.8
49
9.5
115
5.3
You begin your purification by performing an ammonium sulfate (AS) precipitation. You add the appropriate concentration of AS to your CL sample, incubate overnight at 4°C, then
centrifuge to generate a supernatant (AS-S) and pellet (AS-P).
What concentration of AS will you use to precipitate Glutamic dehydrogenase?
© 20%
O 30%
45%
65%
80%
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Transcribed Image Text:You have a crude lysate sample (CL) containing a mixture of six proteins (1, 2, 3, 4, 5, ẞ- galactosidase), and your goal is to obtain purified ẞ-gal. Some characteristics of these proteins are shown in the table below. Protein Alcohol dehydrogenase Carbonic anhydrase Insulin B chain Phosphorylase B Glutamic dehydrogenase B-galactosidase 45% Concentration of ammonium sulfate (AS) required for precipitation Molecular Weight (kDa) Isoelectric point (pl) 38 3.7 80% 65% 20% 30% 45% 28 4.8 4 5.3 98 6.8 49 9.5 115 5.3 You begin your purification by performing an ammonium sulfate (AS) precipitation. You add the appropriate concentration of AS to your CL sample, incubate overnight at 4°C, then centrifuge to generate a supernatant (AS-S) and pellet (AS-P). What concentration of AS will you use to precipitate Glutamic dehydrogenase? © 20% O 30% 45% 65% 80%
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