SPACI score report for 1xgu in ASTRAL 2.06:

PDB Entry: 1xgu
SPACI score: 0.39
AEROSPACI score: 0.39 (mutant; see below)

Experiment type: XRAY
Resolution: 2.1
R-factor: 0.223
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 1
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -0.29
WCK2 WHAT_CHECK Ramachandran: -1.902
WCK3 WHAT_CHECK Chi angles: -1.833
WCK4 WHAT_CHECK Backbone: 2.594

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: "mutant; automatically matched to d1lsg_1; automated match to d1nbya1; automated match to d1nbya2; automated match to d3lzta_"

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).