SPACI score report for 1t8z in ASTRAL 1.71:

PDB Entry: 1t8z
SPACI score: 0.64
AEROSPACI score: -1.36 (mutant; see below)

Experiment type: XRAY
Resolution: 1.45
R-factor: 0.219
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 1
WCK1 WHAT_CHECK Packing: 2.87
WCK2 WHAT_CHECK Ramachandran: 3.432
WCK3 WHAT_CHECK Chi angles: 2.192
WCK4 WHAT_CHECK Backbone: 2.887

The AEROSPACI score for this entry is lower than the SPACI score because human-curated comments on the entry in SCOP contain the phrase mutant. The full comment is: "Tryptophan-zipper mutant; pentamer"

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).