3OB8

Structure of the beta-galactosidase from Kluyveromyces lactis in complex with galactose

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B, D, C	Beta-galactosidase	polymer	1032	118637.3	4	UniProt (P00723) Pfam (PF02837) Pfam (PF00703) Pfam (PF02836) Pfam (PF16353) Pfam (PF02929) In PDB	Kluyveromyces lactis (Yeast)	Beta-gal, Lactase
2	A, B, D, C	beta-D-galactopyranose	non-polymer		180.2	4	Chemie (GAL)
3	C, A, B, D	MAGNESIUM ION	non-polymer		24.3	4	Chemie (MG)
4	C, A, B, D	SODIUM ION	non-polymer		23.0	16	Chemie (NA)
5	C, A, B, D	MANGANESE (II) ION	non-polymer		54.9	4	Chemie (MN)
6		water	water		18.0	1047	Chemie (HOH)

Sequence modifications

A, B, D, C: 2 - 1025 (UniProt: P00723)

PDB	External Database	Details
Asp -6	-	expression tag
Tyr -5	-	expression tag
Lys -4	-	expression tag
Asp -3	-	expression tag
Asp -2	-	expression tag
Asp -1	-	expression tag
Asp 0	-	expression tag
Lys 1	-	expression tag

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	474549.2
Non-Polymers*	Number of molecules	28
	Total formula weight	1405.4
All*	Total formula weight	475954.7

*Water molecules are not included.