protein structure Flashcards
primary structure: summarise the reaction by which amino acids are joined together, sketch a trimeric peptide and identify the amino terminus, carboxyl terminus and side chains
define protein
organic compound with 1 or more amino acid chains
structure of amino acid
H2N-C(H)(R)-COOH; where R is a variable side chain, H2N is an amino group; COOH is carboxyl group and C is the a-carbon
non-polar R group
hydrophobic
glycine as example of non-polar R group
-H (not chiral)
proline as example of non-polar R group
-(CH2)3 bound to a-carbon and N+ (kinky)
what form are non-chiral amino acids in for stability
L-form
polar R group
hydrophilic
serine as example of polar R group
-CH2OH
threonine as example of polar R group
-CH(CH3)(OH)
tyrosine as example of polar R group
-CH2C(CH)4C(OH)
asparagine as example of polar R group
-CH2CONH2
cysteine as example of polar R group
-CH2SH
lysine as example of charged R group
-(CH2)4NH3+
arginine as example of charged R group
-(CH2)3NHC+(NH2)2
aspartate as example of charged R group
-CH2COO-
