SPACI score report for 1tuc in ASTRAL 1.59:

PDB Entry: 1tuc
SPACI score: 0.5
AEROSPACI score: -1.5 (permut; see below)

Experiment type: XRAY
Resolution: 1.77
R-factor: 0.214
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 1.193
WCK2 WHAT_CHECK Ramachandran: -1.097
WCK3 WHAT_CHECK Chi angles: 0.638
WCK4 WHAT_CHECK Backbone: -0.535

The AEROSPACI score for this entry is lower than the SPACI score because human-curated comments on the entry in SCOP contain the phrase permut. The full comment is: "circular permutant"

Note: Here are links to pages about PROCHECK and WHAT_CHECK.

Here is the full WHAT_CHECK report on this protein (linked from the WHAT_CHECK site).