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I hope this makes my point clear

1BX7...the author determined structure is monomeric..PISA generate dimeric assembly

REMARK 350 AUTHOR DETERMINED BIOLOGICAL UNIT: MONOMERIC                         
REMARK 350 APPLY THE FOLLOWING TO CHAINS: A                                     
REMARK 350   BIOMT1   1  1.000000  0.000000  0.000000        0.00000            
REMARK 350   BIOMT2   1  0.000000  1.000000  0.000000        0.00000            
REMARK 350   BIOMT3   1  0.000000  0.000000  1.000000        0.00000   

Remark 350 in orthogonal coordinates

REMARK 350
REMARK 350 SOFTWARE DETERMINED QUATERNARY STRUCTURE: DIMERIC
REMARK 350 SOFTWARE USED: PISA 1.18 
REMARK 350 TOTAL BURIED SURFACE AREA FOR THE COMPLEX:       2330 A**2
REMARK 350 SURFACE AREA FOR THE COMPLEX:                    6730 A**2
REMARK 350 GAIN IN SOLVENT FREE ENERGY:                      -49 KCAL/MOL
REMARK 350 APPLY THE FOLLOWING TO CHAINS: A
REMARK 350   BIOMT1   1  1.000000  0.000000  0.000000        0.00000
REMARK 350   BIOMT2   1  0.000000  1.000000  0.000000        0.00000
REMARK 350   BIOMT3   1  0.000000  0.000000  1.000000        0.00000
REMARK 350   BIOMT1   2  0.000000 -1.000000  0.000000       75.42600
REMARK 350   BIOMT2   2 -1.000000  0.000000  0.000000       75.42600
REMARK 350   BIOMT3   2  0.000000  0.000000 -1.000000      -33.90600


can some one tell how it is???is it that in crystal study no dimeric form is seen???

and what could be the code for this BIOMT transformations...



Regards,
Kanika