SPACI score report for 4gsx in ASTRAL 2.04:

PDB Entry: 4gsx
SPACI score: 0.46
AEROSPACI score: 0.46

Experiment type: XRAY
Resolution: 1.9
R-factor: 0.166
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 3
WCK1 WHAT_CHECK Packing: -2.186
WCK2 WHAT_CHECK Ramachandran: -2.471
WCK3 WHAT_CHECK Chi angles: -3.67
WCK4 WHAT_CHECK Backbone: 1.844

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).