10 Jun PDB entry 1JY4 is a/n ___-stranded b sheet where each strand is arranged
Question
PDB entry 1JY4 is a/n ___-stranded b sheet where each strand is arranged in a/n ________ fashion.
6; parallel
8; antiparallel
6; antiparallel
8; parallel
In a ribbon diagram of the structure of 1JY4, each strand of the b sheet is represented by an arrow that points towards the _____________.
N-terminus
C-terminus
In 1JY4, the presence of _____ at each turn in the ? sheet is _________ with the known properties of the amino acid.
D-Pro; consistent
D-Pro; inconsistent
L-Pro; consistent
L-Pro; inconsistent
PDB entry 2BEG contains a total of 5 oligopeptides; each oligopeptide participates in ___ unique ? sheet/s whose strands are arranged in a/n ________ fashion.
1; parallel
1; antiparallel
2; parallel
2; antiparallel
In 2BEG, the amino acids within each strand of the ? sheets ____ sequentially and significantly alternate between polar and nonpolar.
do
do not
Choose the statement that is consistent with the following rendering of 2BEG: Display the backbone as a “traditional” ribbon for all chains and specifically turn on the visibility for the atoms and bonds of residue D 23 on chain A and residue K 28 on chain B. View this structure in different styles by displaying the atoms of these amino acids in both “small” and “CPK” formats; for comparison, perform the same rendering for the remaining chains.
The ? sheets are stabilized by multiple intrachain ion pairs.
The ? sheets are stabilized by multiple interchain ion pairs.
The ? sheets are stabilized by multiple intrachain hydrogen bonds.
The ? sheets are not stabilized by any intrachain or interchain ion pairs.
Does the abstract for PDB entry 2BEG support the presence of intermolecular bonds between side chains?
Yes
Now
Consider the structure for 4POC. Which of the following conclusions can be made about parallel ? sheets in this protein?
Parallel ? sheets are mostly in the protein interior.
Parallel ? sheets are in the protein interior and on the protein exterior.
Parallel ? sheets are never in the protein interior.
Parallel ? sheets are mostly on the protein exterior.
Consider the structure for 4M43. Which of the following conclusions can be made about antiparallel ? sheets in this protein? Display the backbone as a “traditional” ribbon for all chains and specifically turn on the visibility for the atoms and bonds of residues 69-76 on Chain L.
Antiparallel ? sheets are in the protein interior and on the protein exterior.
Antiparallel ? sheets are mostly in the protein interior.
Antiparallel ? sheets are never on the protein exterior.
Antiparallel ? sheets are mostly on the protein exterior.
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