Hi Edward,

I have a few questions.

Until now I used relax only on 9 - 12 kDa proteins and probed backbone 
relaxation. With an 8-core Intel  workstation it took me only 2 days (if not 
even less!) to do a model-free calculation.

Now I tried a big protein–one with >240 assigned residues. It took 2 days and 
23 rounds to find a optimized spherical diffusion model, and since yesterday it 
churned out 35 prolate diffusion models! 

I understand that with increasing number of spins also computation time 
increases, but how many rounds are "normal" and how does computation time scale 
in respect to number of analyzed spins? Is it indicative of data quality if it 
takes too long to compute?

The protein in the analysis is in a trimeric complex (where only one component 
is labeled at a time, simply to reduce overlap), I guess relax should model the 
correct correlation time and tensor for the whole multimer, and also find the 
correct center of mass? Shouldn't also the tensor parameters of any of the 
multimer components be identical? 

Cheers
Martin
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relax (http://www.nmr-relax.com)

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