SPACI score report for 1an4 in ASTRAL 2.04:

PDB Entry: 1an4
SPACI score: 0.07
AEROSPACI score: 0.07 (mutant; see below)

Experiment type: XRAY
Resolution: 2.9
R-factor: 0.236
PCK1 PROCHECK Ramachandran: 4
PCK2 PROCHECK Chi-1 angle: 4
PCK3 PROCHECK H-bonds: 3
WCK1 WHAT_CHECK Packing: -6.502
WCK2 WHAT_CHECK Ramachandran: -8.877
WCK3 WHAT_CHECK Chi angles: -7.877
WCK4 WHAT_CHECK Backbone: -8.5

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: "protein/DNA complex; mutant"

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).