Patent ID: 11908140
Assignee: ZHEJIANG LAB
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 6:
7. The method for identifying a protein domain based on the protein three-dimensional structure image according to claim 6, wherein HBkikj is calculated as follows:
(1) when the atomic point ki is not nitrogen, or the atomic point kj is not oxygen, HBkikj=0;
(2) when the atomic point ki is nitrogen, and the atomic point kj is oxygen:
(a) when, d
    ˆ
   
   
    
     N
     
      k
      i
     
    
    -
    
     H
     
      k
      i
     
    
    -
    
     O
     
      k
      j
     
    
   
  
  ≥
  
   2
   3
  
 

 and, d
    ⁢
    i
    ⁢
    
     s
     
      
       H
       
        k
        i
       
      
      -
      
       O
       
        k
        j
       
      
     
    
   
   ≤
   
    3
    ⁢
    Å
   
  
  ,
  
   
    
     HB
     
      
       k
       i
      
      ⁢
      
       k
       j
      
     
    
    =
    1
   
   ;
  
 

 and
(b) when, d
    ˆ
   
   
    
     N
     
      k
      i
     
    
    -
    
     H
     
      k
      i
     
    
    -
    
     O
     
      k
      j
     
    
   
  
  <
  
   2
   3
  
 

 and, d
    ⁢
    i
    ⁢
    
     s
     
      
       H
       
        k
        i
       
      
      -
      
       O
       
        k
        j
       
      
     
    
   
   >
   
    3
    ⁢
    Å
   
  
  ,
  
   
    
     HB
     
      
       k
       i
      
      ⁢
      
       k
       j
      
     
    
    =
    0
   
   ;
  
 

where, d
  ⁢
  i
  ⁢
  
   s
   
    
     H
     
      k
      i
     
    
    -
    
     O
     
      k
      j
     
    
   
  
 

 is a distance between a hydrogen atom Hki and an oxygen atom kj on a nitrogen atom ki; and an angle calculated according to three-dimensional coordinates of the nitrogen atom ki and the hydrogen atom Hki and the oxygen atom kj on the nitrogen atom ki after standardized preprocessing is denoted as, d
   
    
     N
     
      k
      i
     
    
    -
    
     H
     
      k
      i
     
    
    -
    
     O
     
      k
      j
     
    
   
  
  ,
 

 and, d
   ˆ
  
  
   
    N
    
     k
     i
    
   
   -
   
    H
    
     k
     i
    
   
   -
   
    O
    
     k
     j
    
   
  
 

 is an angle of, d
  
   
    N
    
     k
     i
    
   
   -
   
    H
    
     k
     i
    
   
   -
   
    O
    
     k
     j
    
   
  
 

 after normalization processing.