> On Dec 9, 2020, at 07:45, Harry Powell - CCP4BB 
> <0000193323b1e616-dmarc-requ...@jiscmail.ac.uk> wrote:
> 
> ...  GDT_TS (Global Distance Test - Total Score - you can look it up on 
> Wikipedia

Thanks, this is helpful.

Wikipedia:

“The primary GDT assessment uses only the alpha carbon atoms.”

Then there’s GDT_sc that incorporates side chains in a soecific way, then 
GDC_all.

References: Zemla A (2003). "LGA: A method for finding 3D similarities in 
protein structures". Nucleic Acids Research. 31(13): 3370–3374. 
doi:10.1093/nar/gkg571. PMC 168977. PMID 12824330.

Keedy, D.A.; Williams, CJ; Headd, JJ; Arendall, WB; Chen, VB; Kapral, GJ; 
Gillespie, RA; Block, JN; Zemla, A; Richardson, DC; Richardson, JS (2009). "The 
other 90% of the protein: Assessment beyond the α-carbon for CASP8 
template-based and high-accuracy models". Proteins. 77 (Suppl 9): 29–49. 
doi:10.1002/prot.22551. PMC 2877634. PMID 19731372.

Modi V, Xu QF, Adhikari S, Dunbrack RL (2016). "Assessment of template‐based 
modeling of protein structure in CASP11". Proteins. 84: 200–220. 
doi:10.1002/prot.25049. PMC 5030193. PMID 27081927.
...............................

The “C-alpha-IDDT” cited in the AlphaFold abstract was published in 2013:

Mariani et. al., Bioinformatics, 29(21), 2722-2728, 2013

The top scores increased after 2013.

-Bryan W. Lepore


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