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Syntax
PCSA {<Pseuso-Chem-Shift-Anis-statement>} END <PCSAnisotropy-statement>:== ASSIgn <selection> <selection> <selection> <selection> <selection> <selection> <selection> <real> <real> <real> {* atom i atom j atom k atom l ! atom m atom n atom o ! PCSA-obs PCSA-err-min PCSA-err-plus *} {* atom i = center, atom j = Z, atom k = X, atom l = Y *} {* atom m defines the central atom *} {* atoms n and o define the at1 and at2 *} {* The unit for PCSA in the constraint file is ppb *} CLASsification <name> ! Starts a new class. Applies to all ! ASSIgn , TYPE, and FORCe entries until ! another CLASS entry is issued. SCALe <real> for normalizing the alignment tensor {* Use the static dipolar coupling (in Hz) for the nuclei ! used to calculate Da ! DNH(r=1.04A) = 21652.1 ; DCH (r=1.08A) = 47965.1 *} COEFficient <real> <real> <real> coef: <DFS> <Da in Hz> <rhombicity> SIGMa <real> <real> <real> CSA sigma <d11> <d22> <d33> <theta> CSA tensor in ppm for A-form RNA or B-form DNA base carbons d33 is orthogonal to the base plane theta is the angle in degrees between d11 and heavy atom bisector ! d11 d22 d33 theta ! for C2:A DNA/RNA 89.0 15.0 -104.0 -2.0 ! for C5:C/U DNA/RNA 82.0 2.0 -85.0 -5.0 ! for C6:C DNA 96.0 19.0 -115.0 28.0 ! for C6:T DNA 97.0 -1.0 -96.0 29.0 ! for C6:C/U RNA 125.0 -7.0 -119.0 29.0 ! for C8:A DNA/RNA 74.0 5.0 -79.0 32.0 ! for C8:A DNA/RNA 80.0 5.0 -85.0 32.0 FORCeconstant <real> ! force constant for all ! assignments in the current class. {default = 0.010} NREStraints <integer> ! number of slots for CSAnisotropy ! restraints to allocate in memory {default = 200} POTEntial <SQUAre | HARMonic> ! whether to use CSA-err or not PRINt THREshold <real> ! prints CSAnisotropy violations ! greater than the specified value RESEt ! erases the CSA. assignment table, but keeps ! NREStraints the same.
Xplor-NIH 2024-09-13