Question

The PDB entry 1jy4 is a/n ___ strand sheet, where each strand is arranged in a/n ________ fashion.

Option 1: Parallel, Anti-parallel
Option 2: Beta, Alpha
Option 3: Helical, Random
Option 4: Zigzag, Coiled

Answer 1

The PDB entry 1jy4 represents an antiparallel B-pleated sheet.

Step-by-step explanation:

The PDB entry 1jy4 represents a B-pleated sheet, where each strand is arranged in an anti-parallel fashion.

In a B-pleated sheet, two or more extended polypeptide chains are aligned side by side. The aligned segments can run either parallel or antiparallel. In this case, the N-termini of adjacent chains face in opposite directions. The chains are connected by interchain hydrogen bonding.

This secondary structure is commonly found in structural proteins like silk fibroin and portions of many enzymes including carboxypeptidase A and lysozyme.