6EQ1

Structure of the periplasmic binding protein (PBP) MelB (Atu4661) in complex with stachyose from agrobacterium fabrum C58

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A, B (B, A)	Periplasmic alpha-galactoside-binding protein	polymer	683	76359.6	2	UniProt (A0A083ZM57)	Rhizobium radiobacter (Agrobacterium tumefaciens)	MelB
2	C, D (C, D)	beta-D-galactopyranose-(1-6)-beta-D-galactopyranose-(1-6)-alpha-D-glucopyranose-(1-2)-beta-D-fructofuranose	branched		666.6	2	In PDB
3	E (B)	TETRAETHYLENE GLYCOL	non-polymer		194.2	1	Chemie (PG4)
4	DA, F, G, H, I... (A, B)	DI(HYDROXYETHYL)ETHER	non-polymer		106.1	8	Chemie (PEG)
5	EA, M, N, O, P... (A, B)	1,2-ETHANEDIOL	non-polymer		62.1	13	Chemie (EDO)
6	AA, BA, CA, FA, GA... (B, A)	CALCIUM ION	non-polymer		40.1	9	Chemie (CA)
7	JA, KA (B, A)	water	water		18.0	208	Chemie (HOH)

Sequence modifications

B, A: 1 - 677 (UniProt: A0A083ZM57)

PDB	External Database	Details
His 678	-	expression tag
His 679	-	expression tag
His 680	-	expression tag
His 681	-	expression tag
His 682	-	expression tag
His 683	-	expression tag

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	152719.2
Branched	Number of molecules	2
	Total formula weight	1333.2
Non-Polymers*	Number of molecules	31
	Total formula weight	2210.8
All*	Total formula weight	156263.1

*Water molecules are not included.