Flavodoxin fold
Encyclopedia
The flavodoxin fold is a common α/β protein fold, second only to the TIM barrel
fold. It has three layers, with two α-helical
layers sandwiching a 5-stranded parallel β-sheet
. The order of strands within the sheet is 21345.
TIM barrel
The TIM barrel is a conserved protein fold consisting of eight α-helices and eight parallel β-strands that alternate along the peptide backbone. The structure is named after triosephosphate isomerase, a conserved glycolytic enzyme. TIM barrels are quite common among the conserved protein folds...
fold. It has three layers, with two α-helical
Alpha helix
A common motif in the secondary structure of proteins, the alpha helix is a right-handed coiled or spiral conformation, in which every backbone N-H group donates a hydrogen bond to the backbone C=O group of the amino acid four residues earlier...
layers sandwiching a 5-stranded parallel β-sheet
Beta sheet
The β sheet is the second form of regular secondary structure in proteins, only somewhat less common than the alpha helix. Beta sheets consist of beta strands connected laterally by at least two or three backbone hydrogen bonds, forming a generally twisted, pleated sheet...
. The order of strands within the sheet is 21345.