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lactose synthase (LS)
Structure:
- heterodimer of a catalytic component, beta-1,4-galactosyltransferase (beta4gal-T1) & a regulatory component, alpha-lactalbumin (LA)
General
glycosyltransferase
milk protein
molecular complex
synthase
Properties
COMPARTMENT: extracellular compartment
MOTIF: active site
SUBUNITS: alpha-lactalbumin
MOTIF: signal sequence {1-19}
cysteine residue {C25}
MODIFICATION: cysteine residue {C139}
cysteine residue {C47}
MODIFICATION: cysteine residue {C130}
N-glycosylation site {N64}
cysteine residue {C80}
MODIFICATION: cysteine residue {C96}
N-glycosylation site {N90}
cysteine residue {C92}
MODIFICATION: cysteine residue {C110}
cysteine residue {C96}
MODIFICATION: cysteine residue {C80}
Ca+2-binding site
SITE: 97-108
cysteine residue {C110}
MODIFICATION: cysteine residue {C92}
cysteine residue {C130}
MODIFICATION: cysteine residue {C47}
cysteine residue {C139}
MODIFICATION: cysteine residue {C25}
beta-1,4-galactosyltransferase 1
COMPARTMENT: plasma membrane
golgi
MOTIF: transmembrane domain {25-44}
peptide motif {77-78}
N-glycosylation site {N113}
cysteine residue {C130}
MODIFICATION: cysteine residue {C172}
cysteine residue {C172}
MODIFICATION: cysteine residue {C130}
cysteine residue {C243}
MODIFICATION: cysteine residue {C262}
manganese [Mn]-binding site
SITE: 250-250
cysteine residue {C262}
MODIFICATION: cysteine residue {C243}
manganese [Mn]-binding site
SITE: 343-343
Components
alpha-lactalbumin; lactose synthase B protein; lysozyme-like protein 7 (LALBA LYZL7)
beta-1,4-galactosyltransferase 1; UDP-galactose:beta-N-acetylglucosamine beta-1,4-galactosyltransferase 1; UDP-Gal:beta-GlcNAc beta-1,4-galactosyltransferase 1 (B4GALT1)