SPACI score report for 1sif in ASTRAL 2.06:

PDB Entry: 1sif
SPACI score: 0.4
AEROSPACI score: -1.6 (mutant; see below)

Experiment type: XRAY
Resolution: 2.18
R-factor: 0.196
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.117
WCK2 WHAT_CHECK Ramachandran: -0.407
WCK3 WHAT_CHECK Chi angles: -0.65
WCK4 WHAT_CHECK Backbone: 4.216

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: "a multiple hydrophobic core mutant !SQ P62988; a multiple hydrophobic core 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).