{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

lecture_4 - Chapter 4 Amino Acids Acids Amino acid...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 4 Amino Acids Amino acid structure General properties Peptide bonds Cl ifi ti d h t i ti Classification and characteristics Acid-base properties – Nomenclature Nomenclature • Stereochemistry • Nonstandard amino acids Nonstandard amino acids Amino acid derivatives D-amino acids 1 Biologically active amino acids
Background image of page 1

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

View Full Document Right Arrow Icon
Amino acid Backbone of an amino acid is composed of the N, C , and C Amino acid structures and sequences are written from sequences are written from left to right, starting with the N-terminus (amino) and finishing with the C- terminus (carboxyl) Please carefully note the charged ends (termini). At physiological pH the The thing that differentiates each amino acid is the “R” At physiological pH, the ends of an amino acid are charged. Certain “R” 2 group • C is chiral, except in Gly groups will also be charged at pH 7.
Background image of page 2
General properties The backbone of individual amino acids are zwitterionic (i.e. has both a positively charged and a negatively charged ) group) In addition, some amino acids have ionizable (i.e. charged) side chains Because of these ionizable groups (backbone and some side chains) amino acids can have a number of different charge chains), amino acids can have a number of different charge states • The “R” group in an amino acid is called the side chain The R group in an amino acid is called the side chain An amino acid is often called a “residue” (i.e. an amino acid residue) 3 There are 20 standard amino acids - they all differ in “R”
Background image of page 3

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

View Full Document Right Arrow Icon
Peptide bonds As mentioned previously, amino acids b d h (i can be connected together (i.e.
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}