lecture_5 - Amino Acids 1/29/2003 Amino Acids: The building...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Amino Acids 1/29/2003
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Amino Acids: The building blocks of proteins α amino acids because of the α carboxylic and α amino groups pK 1 and pK 2 respectively pK R is for R group pK’s pK 1 2.2 while pK 2 9.4 pK 1 pK 2 In the physiological pH range, both carboxylic and amino groups are completely ionized
Background image of page 2
Amino acids are Ampholytes They can act as either an acid or a base They are Zwitterions or molecules that have both a positive and a negative charge Because of their ionic nature they have extremely high melting temperatures
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Amino acids can form peptide bonds Amino acid residue peptide units dipeptides tripeptides oligopeptides polypeptides Proteins are molecules that consist of one or more polypeptide chains Peptides are linear polymers that range from 8 to 4000 amino acid residues There are twenty (20) different naturally occurring amino acids
Background image of page 4
Linear arrays of amino acids can make a huge number of molecules Consider a peptide with two amino acids AA1 AA2 20 x 20 = 400 different molecules AA1 AA2 AA3 20 x 20 x 20 = 8000 different molecules For 100 amino acid protein the # of possibilities are: 130 100 10 27 . 1 20 x = The total number of atoms in the universe is estimated at 78 10 9 x
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/22/2011 for the course BCHS 3304 taught by Professor Johnson during the Spring '08 term at University of Houston.

Page1 / 23

lecture_5 - Amino Acids 1/29/2003 Amino Acids: The building...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online