SPACI score report for 1chq in ASTRAL 1.69:

WARNING! The SPACI score for this entry is not valid. The R-factor is not available and an abitrary R-factor has been used.

PDB Entry: 1chq
SPACI score: 0.34 (not valid)
AEROSPACI score: 0.34 (not valid) (mutant; see below)

Experiment type: XRAY
Resolution: 2.1
R-factor: 0.25
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 2.574
WCK2 WHAT_CHECK Ramachandran: -1.906
WCK3 WHAT_CHECK Chi angles: -2.815
WCK4 WHAT_CHECK Backbone: -4.61

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: "mutant"

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).