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Table 1 Rules for assignment of structural classes based on the content of the corresponding secondary structures.

From: SCPRED: Accurate prediction of protein structural class for sequences of twilight-zone similarity with predicting sequences

reference

structural class

α-helix amount

β-strand amount

additional constrains

[13]

all-α

≥ 40%

≤ 5%

 
 

all-β

≤ 5%

≥ 40%

 
 

α+β

≥ 15%

≥ 15%

more than 60% antiparallel β-sheets

 

α/β

≥ 15%

≥ 15%

more than 60% parallel β-sheets

[14]

all-α

> 15%

< 10%

 
 

all-β

< 15%

> 10%

 
 

mixed

> 15%

> 10%