SPACI score report for 1tqb in ASTRAL 2.08:

PDB Entry: 1tqb
SPACI score: 0.3
AEROSPACI score: -1.7 (chimer; see below)

Experiment type: XRAY
Resolution: 2.55
R-factor: 0.214
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 0.066
WCK2 WHAT_CHECK Ramachandran: -2.346
WCK3 WHAT_CHECK Chi angles: -2.198
WCK4 WHAT_CHECK Backbone: 0.053

The AEROSPACI score for this entry is lower than the SPACI score because human-curated comments on the entry in SCOPe contain the phrase chimer. The full comment is: "MQ P06327 P01864 #; natural chimera; MQ P01631 P01837 #; MQ P01631 P01837 # ! natural chimera; MQ P06327 P01864 # ! natural chimera"

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).