Question

what are alpha and beta structures​

Answer 1

beta-alpha-beta supersecondary units, such that the outer layer of the structure is composed of alpha helices packing against a central core of parallel beta sheets. These folds are called alpha/beta , or wound alpha beta (c.f. alpha +beta structures).

Many enzymes, including all those involved in glycolysis , are alpha/beta structures. Most alpha/beta proteins are cytosolic.

The beta-alpha-beta unit has already been described in a previous chapter . This motif is always right-handed. In alpha/beta structures, there is a repetition of this arrangement, giving a beta-alpha-beta-alpha.....etc sequence. The beta strands are parallel and hydrogen bonded to each other, while the alpha helices are all parallel to each other, and are anitparallel to the strands. Thus the helices form a layer packing against the sheet.

The beta-alpha-beta-alpha-beta subunit, often present in nucleotide-binding proteins, is named the Rossman Fold, after Michael Rossman (Rao and Rossman,1973).

#twinkle...✌️

Answer 2

The most regular and common domain structures consist of repeating beta-alpha-beta supersecondary units, such that the outer layer of the structure is composed of alpha helices packing against a central core of parallel beta sheets. These folds are called alpha/beta , or wound alpha beta (c.f. alpha +beta structures).