SPACI score report for 1b4p in ASTRAL 2.02:

PDB Entry: 1b4p
SPACI score: 0.53
AEROSPACI score: -1.47 (chimer; see below)

Experiment type: XRAY
Resolution: 1.7
R-factor: 0.179
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.344
WCK2 WHAT_CHECK Ramachandran: -0.799
WCK3 WHAT_CHECK Chi angles: -1.562
WCK4 WHAT_CHECK Backbone: -0.892

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: "chimeric isoenzyme; chimeric isozyme"

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).