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WEEK 5:

Chemical Structure of Proteins

QuestionAnswer
naturally occurring amino acids are what enantiomers L
properties of standard amino acids
amino acids containing sulfur methionine + cysteine
protein synthesis mostly begins with what methionine
cystine can form what complexes with metal ions + disulfide bonds
where do disulfides not form cytosol
proteins containing disulfides are found where outside cell
protein sequences N terminus to C terminus
why does the N-C bond in the peptide bond have restricted rotation N-C acts like double bond
HN-CO shape planar
isomerism in peptide bonds cis trans (geometrical)
two bonds on either side of alpha carbon phi + psi
what can phi + psi do rotate + some clash
ramachandran plot phi + psi angles for amino acids can be plotted
bonds in primary structure S-S
bonds in secondary structure hydrogen
structures in secondary structure alpha helices + b sheets
alpha helices single stretches arranged in regular right-handed helix with hydrogen bonds along the length
beta sheets formed with 2 or more beta strands with hydrogen bonds along adjacent strands
tertiary structure protein folding into defined shapes where secondary elements fold together into motifs + domains
motifs secondary structure elements combine = larger units, where elements are linked in specific combinations
when do domains occur polypeptides greater than 200 aa
domains independent functional unit of polypeptide in tertiary structure
quaternary structure functional proteins formed from 1+ polypeptides
homo-oligomer complex with identical polypeptides
hetero-oligomer complex with non-identical polypeptides
protomer smallest distinct unit in complex
arrangement of subunits in quaternary structure symmetrically
amino acid isomerism optical
Created by: kablooey
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