The characterization of Amino Acids and the Purification of Proteins Shawndell Powell High School for Medical Science Bronx, NY, Dr. Jeffrey O. Boles Chemistry Department Tennessee Technological University Cookeville, TN, 38505

Amino Acids A class of organic compounds that contain both the amino and carboxyl groups. Of these acids, 20 serve as the building blocks of proteins. Known as the standard, or alpha, amino acids, they comprise serine and tryptophan which are 2 of the 20 that are constructed according to a general formula: H2NH2N R CC H O OH

Proteins A large number of organic compounds that make up living organisms and are essential to their functioning. Whether found in humans or in single- celled bacteria, proteins are composed of units of about 20 different amino acids

To make selenatryptophan more commercially available Run a TLC (Thin Layer Chromatography) Purify Proteins Objective: Goal:

RxN Se-Indole analog substrate synthesized at Los Alamos National Lab to make with 90% yield the enzyme that were over expressed in bacteria and then purified using medium pressure liquid chromatography commercially available buffer to control pH product analysis by TLC & NMR selenatryptophan centraprep to remove enzyme better yield reproducibility

Running a TLC Dissolve 10mg (0.01g) into 2mL of dH 2 O Vortex until in solution

Running a TLC Spot sample on a TLC plate Set in TLC solution for about 10-15mins.

Running a TLC Look at it under a light Circle samples movement

Running a TLC Set it in a jar of iodine or spray it with ninhydrant Then dry it with a plow dryer

Results

Purifying Proteins Turn on recorder, detector, gradifrac, and P-50 pump. Put on recorder pens In “wash” mode with the P-1 pump, pass H2O of 10% EtOH through P-1 out port 4 to waste, then turn P-1 off Change to “inject” mode, turn P-1 on and pass 2- 3mL of H20 or 10% EtOH through the column Turn P-1 off, switch to Buffer A, turn on P-1 on for 2-3mins. Wash Mode:

Drop A & B line of P-50 into Buffer A and Buffer B, change to “wash” mode Run method 0 on gradifrac P-50 Preparation:

Change to “inject” mode Put P-1 line in Buffer A and pump 2mls Turn off P-1 pump Go into manual mode on gradifrac and set it to 0% B, 2ml/min, 8ml fractions, and put line 6 in Buffer A after line 6 spends 2mins in waste beaker Loading CFE (Cell Free Extract):

Pump Buffer A through P-1 to equilibrate the column. Turn P-1 off and press “pause” on gradifrac Put P-1 line in CFE, turn on P-1, press “continue” on gradifrac and load the CFE, turn off P-1 and switch line back to buffer A Continue with Buffer A through P-1 for mins.(until the recorder approaches the base line Press “end” on gradifrac, turn off P-1 Change valve to “load” mode and run method

Push “end” on gradifrac Set valve to “inject” mode Pump P-1 line in strip buffer and turn on P-1 on Pump until column is white Turn off P-1 and change line to 10% EtOH Run 10% EtOH through column for 10mins Stripping Chelating Sepharose:

Push “end” on gradifrac Change valve to “inject” mode, put P-1 line in 10% EtOH and turn P-1 on for 10mins. Turn P-1 pump Change valve to “wash” mode, drop P-50 A & B lines into 10% EtOH and run method 9 on gradifrac Turn all power off. After finishing your chromatography:

Acknowledgements Dr. Boles Jeffrey Dr. Dan Dr. Sat Harlem Children Society Chemistry Dept. at TTU