Amino acids, Biology

 

  • An amino acid is amphiprotic (have both acid and base)

             o    Some are polar, non polar, acidic or basic

  • List of amino acids (red are non-polar, yellow are polar, green are acidic, blue are basic, starred are essential)

 

  •  An amino acid is amphiprotic (have both acid and base)

             o    Some are polar, non polar, acidic or basic

  •  List of amino acids (red are non-polar, yellow are polar, green are acidic, blue are basic, starred are essential)

 
                o    Glycine (gly)
                o    Alanine (ala)
                o    Valine (val)*
                o    Leucine (leu)*                                                                                    
                o    Isoleucine (ile)*
                o    Methionine(met)*
                o    Phenylalanine(phe)*
                o    Tryptophan (trp)*
                o    Proline (pro)

               o    Serine (ser)

 

                                                                1512_properties of Amino Acids.png1568_Amino Acids.png

 

               o    Threonine(thr)*
               o    Cysteine (cys)
               o    Tyrosine (tyr)

               o    Asparagines (asn)
               o    Glutamine (gln)
               o    Glutamic Acid (glu)
               o    Aspartic Acid (asp)

              o    Lysine (lys)*
              o    Arginine (arg)

              o    Histidine (his)

Properties of Amino Acids

Peptide Bond - bond between the acid group of one amino acid and the amino group of another
Dipeptide - 2 amino acids joined by a

peptide bond

  • Coded for by DNA and created by the ribosomes
  • Proteins are long, flexible and able to form different links with themselves or other molecules
  • Have an amino(A)-terminus and a Carboxyl(C)-terminus

Protein Structure

  • A Protein's function depends on its shape which depends on its amino acids

 

  • Primary Structure
    • Long chain of amino acids linked by covalent peptide bonds à in specific order
  • Secondary Structure
    • Intermolecular forces (mostly H-bonds) cause the chain to coil into an α-helix or fold into a β-pleated sheet
  • Tertiary Structure
    • Chaperone proteins help a growing polypeptide fold into its tertiary structure
    • Supercoiling due to polarity, the shape of the amino acids (e.g. proline causes a kink), other components (e.g. iron) and disulfide bridges.
  • Quaternary Structure
    • Various polypeptides join together with intermolecular forces to form a protein

Denaturing of Proteins

  • Change in è Heat, pH, temperature, ionic concentration etc.
    • Can cause changes in the 3-D structure of the protein

                        Change can be permanent if the 1° structure is broken

                        Change can be reversed if only the 3° structure is broken

  • Use of denaturing proteins à Food preservation

 

 

 

Posted Date: 8/20/2012 4:24:44 PM | Location : United States







Related Discussions:- Amino acids, Assignment Help, Ask Question on Amino acids, Get Answer, Expert's Help, Amino acids Discussions

Write discussion on Amino acids
Your posts are moderated
Related Questions
A field trip to observe flowers:- Plan a field trip to view flowers in bloom. If no interesting wildflowers can be found growing near the school, the trip can be planned to a p

Define Clinical Features and Medical Complications for bulimia? Unlike, anorexia nervosa, in bulimia you will find that symptoms are more difficult to detect because patients a

what is the main excretory organ of a lizard

Describe how the International Astronomical Union defines a planet. Also include why Pluto is no longer considered a planet.

How cell divides?

Which of the following serves as a controlled variable in a negative feedback system? A. Levels of hydrogen ions in the interstitial spaces of the brainstem. B. Blood plasma

Q. Use of Chemicals to Control and Destruct Microorganisms? Ans. The use of chemicals, as a process of food preservation, has been used since long, ever since man found

What are the main human diseases caused by virus? Between diseases caused by virus are common cold, flu, mumps, variola (considered eradicated nowadays), rubella, AIDS, measles

he recombinant plasmid extracted from the surviving colonies contains a gene called SUC2 that codes for convertase, an enzyme needed to metabolize sucrose. Mutations in the SNF gen

Mention the role o ribosome's in peptide -bond formation .How does ATP facilitate it? a) Of springs derived by asexual reproduction are known as clones. Justify giving two R