The SH3 domain contains several overlapping instances of this structure, which is also found in a radially symmetric arrangement in neuraminidase, known as a "propeller" domain. Aspartic proteases contain three of them in the psi-loop, while a meandering linkage of them is found in the Greek key structure. The immunoglobulin fold contains only these elements, while a more famous superstructure contains several of these twisted into a cylinder and
The SH3 domain contains several overlapping instances of this structure, which is also found in a radially symmetric arrangement in neuraminidase, known as a "propeller" domain. Aspartic proteases contain three of them in the psi-loop, while a meandering linkage of them is found in the Greek key structure. The immunoglobulin fold contains only these elements, while a more famous superstructure contains several of these twisted into a cylinder and linked by disordered turns, and is commonly found in RBP, porins, and Green fluorescent protein; that motif if this structure's namesake "barrel". They can be either parallel or antiparallel, the former of which has straight hydrogen bonds. For 10 points, name this protein secondary structure in which the side chains of amino acids point outwards, which is complementary to the alpha helix.
The SH3 domain contains several overlapping instances of this structure, which is also found in a radially symmetric arrangement in neuraminidase, known as a "propeller" domain.
{Beta} sheet