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Folds can have a fold axis. A fold axis "is the closest approximation to a straight line that when moved parallel to itself, generates the form of the fold". [2] (Ramsay 1967). A fold that can be generated by a fold axis is called a cylindrical fold. This term has been broadened to include near-cylindrical folds.
Chevron folds are energetically preferred to conventional sinusoidal folds as they minimize ductile flow to the expense of localized bending. [ 3 ] Four stages mark development of chevron folds: sinusoidal nucleation, concentric folding , straightening of limbs/sharpening of hinges, and tightening of the chevron fold. [ 2 ]
The evolution depends on fold kinematics, [1] Fold mechanism, [2] [3] as well as a reporting of the history behind folds and relationships by which fold age is understood. [4] There are several ways to reconstruct the evolution progress of folds, notably by using depositional evidence, geomorphological evidence and balanced restoration .
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The fold to which a domain belongs is determined by inspection, rather than by software. The levels of SCOP version 1.75 are as follows. Class: Types of folds, e.g., beta sheets. Fold: The different shapes of domains within a class. Superfamily: The domains in a fold are grouped into superfamilies, which have at least a distant common ancestor.
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The TIM barrel gets its name from the enzyme triose-phosphate isomerase (TIM), which was the first protein possessing the fold to be crystallized. [3] TIM barrels contain 200-250 amino acid residues, [2] folded into 8 alpha helices (α-helices) and 8 beta strand (β-strands).