SPACI score report for 1b6q in ASTRAL 2.07:

PDB Entry: 1b6q
SPACI score: 0.52
AEROSPACI score: -1.48 (mutant; see below)

Experiment type: XRAY
Resolution: 1.8
R-factor: 0.189
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 1
WCK1 WHAT_CHECK Packing: 1.745
WCK2 WHAT_CHECK Ramachandran: -0.306
WCK3 WHAT_CHECK Chi angles: -1.155
WCK4 WHAT_CHECK Backbone: 6.972

The AEROSPACI score for this entry is lower than the SPACI score because human-curated comments on the entry in SCOPe contain the phrase mutant. The full comment is: "single-residue mutant with a changed dimer topology"

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).