3C6Q

Apo and ligand-bound form of a thermophilic glucose/xylose binding protein

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	B, A, C, D	Sugar ABC transporter, periplasmic sugar-binding protein	polymer	311	33706.9	4	UniProt (Q9WXW9) Pfam (PF13407) In PDB	Thermotoga maritima
2	C, D	beta-D-xylopyranose	non-polymer		150.1	2	Chemie (XYP)
3		water	water		18.0	345	Chemie (HOH)

Sequence modifications

B, A, C, D: 2 - 305 (UniProt: Q9WXW9)

PDB	External Database	Details
Met 1	-	initiating methionine
Cys 41	Glu 71	engineered mutation
Cys 163	Glu 193	engineered mutation
His 306	-	expression tag
His 307	-	expression tag
His 308	-	expression tag
His 309	-	expression tag
His 310	-	expression tag
His 311	-	expression tag

Contents of the asymmetric unit

Polymers	Number of chains	4
	Total formula weight	134827.7
Non-Polymers*	Number of molecules	2
	Total formula weight	300.3
All*	Total formula weight	135128.0

*Water molecules are not included.