22.10. What Is the Tertiary Structure of a Protein?, 598
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Denaturation of Protein by Strong AcidJohn W. Moore, Jerrold J. Jacobsen, Gary Trammell, Kristin Johnson "Strong acid denatures egg white proteins.This video contains voiceover:""The tertiary structure of egg white proteins is held together by hydrogen bonding and hydrophobic interactions. Adding strong acid to the protein disrupts the intermolecular forces, and the tertiary structure is lost. The loss in protein structure is called denaturation. The proteins precipitate, forming a white solid."""
Acids / Bases |
Proteins / Peptides
Nature of Proteins Effect of pH on solubility, denaturing proteins, hydrolysis in strong base, binding to coomassie blue, dying wool and cotton, gel filtration column, reaction of ninhydrin with amino acids and precipitating protein with ammonium sulfate are demonstrated.
Proteins / Peptides
Protein Reactions Curdling milk, decomposition of hydrogen peroxide by catalase, glucose oxidase activity, hydrolyzing of sucrose with invertase, and using an enzyme to halt the Briggs-Rauscher reaction are demonstrated. Inhibiting the enzyme HIV-1 protease may slow the spread of AIDS.
A "Polypeptide Demonstrator"Addison Ault I have used a telephone Handset Coil Cord as a simple and convenient model for the structure of a polypeptide. Ault, Addison. J. Chem. Educ.2004, 81, 196.
Proteins / Peptides |
Molecular Modeling |
Molecular Properties / Structure
Some Like It Cold: A Computer-Based Laboratory Introduction to Sequence and Tertiary Structure Comparison of Cold-Adapted Lactate Dehydrogenases Using Bioinformatics ToolsM. Sue Lowery and Leigh A. Plesniak Students download sequences and structures from appropriate databases, create sequence alignments, and carry out molecular modeling exercises, and then form hypotheses about the mechanism of biochemical adaptation for function and stability. This laboratory is appropriate for biochemistry and molecular biology laboratory courses, special topics, and advanced biochemistry lecture courses, and can be adapted for honors high school programs. Lowery, M. Sue; Plesniak, Leigh A. J. Chem. Educ.2003, 80, 1300.
Umami and ProteinsRobert Hetue A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Proteins / Peptides
ChemPaths 104 M Jan 31John W. Moore Today in Chem 104:
* Lecture: Biochemistry: Proteins
* Reading:
Kotz: Chemistry of Life (pp. 496-502);
Moore: Ch 3, Sec 11; Ch 12, Sec 7
* Biomolecules Tutorials
o Proteins 1 (including debriefing)
o Proteins 2 (including debriefing)
o Quiz due W Feb. 2, 11:55 PM)
* Homework #3 due by 11:55pm F Feb 4.
Proteins / Peptides
Polypeptide ChainsEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
