Go to Protein NMR
3D HNCACB experiment

PRELIMINARY SET-UP PARAMETER SET
Create a new dataset with edc or, alternatively, increment the experiment number with the iexpno command.

Read the standard parameter set necessary to record a gradient-based sensitivity-enhanced 3D HNCACB experiment by typing rpar HNCACBGP3D all (the hncacbgp3d pulse program can be displayed with the edcpul command).

Channel
f1
f2
f3
Nucleus
1H
13C
15N
Offset
o1p
o2p
o3p
Carrier
4.75 ppm
37.36 ppm
115.5 ppm
 
MODIFY SPECIFIC PARAMETERS
Update the corresponding pulses and power levels in the acquisition parameters according to the selected solvent/probehead parameters by executing the getprosol command (pulses and power levels must be correctly set by the edprosol command). The following hard and shaped pulses applied on the three channels must be previously calibrated:

Otherwhise, all required acquisition parameters can be displayed with the ased command. By default:
 

 
Dimension
F3
F2
F1
Nucleus
1H
15N
13C
TD
2048
40
128
Spectral width
NH 
(14.08 ppm)
(31.8 ppm)
13CA+13CB
(75 ppm)
 

Interpulse delays:

            d22 is optimized to 1/(4*JN-CA) (12.4 ms)
            d23 is optimized to 1/(4*JC-C) (3.5 ms)
            d26 is optimized to 1/(4*JN-H) (2.3 ms)

All other delays are automatically calculated from these values. Gradient parameters are already defined and the user must be set the number of scans and dummy scans (by default, ns=8 and ds=16) as a function of sample concentration. This experiment contains 3 gradients and the standard parameters are already defined with p16 of 1ms, d16=100u, gpnam1-3=sine.100 and the ratio is 30:80:8.1.

ACQUISITION
Start acquisition by rga and zg (the expected experimental time can be observed with the expt command).
PROCESSING
Process the recorded data with tf3, tf2 and tf1. The standard processing parameters are set to:
 
Dimension
F3
F2
F1
SI
2048
256
512
MC2
-
echo/antiecho
States-TPPI
WDW
QSINE
QSINE
QSINE
Offset
2
2
2
 ME_mod
no
LPfc
LPfc
NCOEF
0
32
32
 
PLOT
 Use XWINPLOT.
OBSERVATIONS
It is advisable to store all acquisition and processing parameters (for instance, with the wpar hncacb all command) to be used later.
OTHER RELATED VERSIONS
Closely related pulse programs are also available:

List of Related Experiments:

Double-Resonance 1H-13C experiments
Double-Resonance 1H-15N experiments
Triple-Resonance 1H-13C-15N backbone experiments
Triple-Resonance 1H-13C-15N sidechain experiments