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# naccess - Calculate accessible area of a molecule¶

CalculateSurfaceArea(entity, radius=1.4, include_hydrogens=False, include_hetatm=False, include_water=False, selection='', naccess_exe=None, keep_files=False, asa_abs='asaAbs', asa_rel='asaRel', asa_atom='asaAtom', scratch_dir=None, max_number_of_atoms=50000)

Calculates analytical the solvent accessible surface area by using the external naccess program

This method calculates the molecular surface areas by invoking the external program naccess. First, it is checked if the naccess executable is present, then, the necessary files are prepared in a temporary directory and naccess is executed. The last step is to remove the temporary directory.

Parameters: entity – OST entity to calculate surface radius – Surface probe radius include_hydrogens – Calculate surface including hydrogens include_hetatm – Calculate surface including hetatms include_water – Calculate surface including water selection – Calculate surface for subset of entity naccess_exe – naccess executable (full path to executable) keep_files – Do not delete temporary files asa_abs – Attaches per residue absolute SASA to specified FloatProp on residue level asa_rel – Attaches per residue relative SASA to specified FloatProp on residue level asa_atom – Attaches per atom SASA to specified FloatProp at atom level scratch_dir – Directory for temporary files (NACCESS is sensitive to ”.” in directory names max_number_of_atoms – Max Number of atoms in the entity (i.e. is limited in the default NACCESS version to 50 000) absolute SASA calculated using asa_atom

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