Proteus mirabilis N-acetylneuraminate lyase

The structure of Proteus mirabilis N-acetylneuraminate lyase reveals an intermolecular disulphide bond

NKLSGLIAAPHTPFAADGSVNYPVIDDIAKHLIATGVTGAYVLGTTGEGIHCSVEERKKVAERWVTASQGQLDLIIHTGA
LSIADTLELARHAETLDIKATSVIGPCFFKPSHVDDLVEYCRLAAASAPSKGFYYYHSTMSGLSIDMEKFLQAAGKVIPN
LSGMKFNSPDMYEFQRCLRVEGGKYDIPFGVDEFIPAGLACGALSAVGSTYNYAAPLYLELIEKFNQGDHQGVADCMDKV
IAIIRVLVEYGGVAAGKVAMQLHGIDVGAPRRPLRPLTAEQKADALAKFKAANFL

0.5 M ammonium sulfate, 1 M lithium sulfate monohydrate, 0.1 M sodium citrate tribasic dehydrate, pH 5.6

sialic acid, N-acetylneuraminate lyase, NAL, LYASE

NKLSGLIAAPHTPFAADGSVNYPVIDDIAKHLITTGVTGAYVLGTTGEGIHCSVEERKKVAERWVTASQGQLDLIIHTGA
LSIADTLELARHAETLDIKATSVIGPCFFKPSHVDDLVEYCRLAAASAPSKGFYYYHSTMSGLSIDMEKFLQAAGKVIPN
LSGMKFNSPDMYEFQRCLRVEGGKYDIPFGVDEFIPAGLACGALSAVGSTYNYAAPLYLELIEKFNQGDHQGVADCMDKV
IAIIRVLVEYGGVAAGKVAMQLHGIDVGAPRRPLRPLTAEQKADALAKFKAANFL