SPACI score report for 1yig in ASTRAL 1.73:

PDB Entry: 1yig
SPACI score: 0.46
AEROSPACI score: 0.46 (mutant; see below)

Experiment type: XRAY
Resolution: 2
R-factor: 0.219
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 1
WCK1 WHAT_CHECK Packing: 3.534
WCK2 WHAT_CHECK Ramachandran: 2.134
WCK3 WHAT_CHECK Chi angles: 2.397
WCK4 WHAT_CHECK Backbone: -1.526

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; automatically matched to 1YIG A:190-255; automated match to d1yiga1"

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).