3C1J

Substrate binding, deprotonation and selectivity at the periplasmic entrance of the E. coli ammonia channel AmtB

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A	Ammonia channel	polymer	424	44299.5	1	UniProt (P69681) Pfam (PF00909) In PDB	Escherichia coli	Ammonia transporter
2	A	ACETATE ION	non-polymer		59.0	1	Chemie (ACT)
3	A	IMIDAZOLE	non-polymer		69.1	1	Chemie (IMD)
4	A	GLYCEROL	non-polymer		92.1	1	Chemie (GOL)
5		water	water		18.0	120	Chemie (HOH)

Sequence modifications

A: 1 - 406 (UniProt: P69681)

PDB	External Database	Details
Ala 107	Phe 129	engineered mutation
Ala 215	Phe 237	engineered mutation
Asp 407	-	expression tag
Gln 408	-	expression tag
Ala 409	-	expression tag
Gln 410	-	expression tag
Gln 411	-	expression tag
Pro 412	-	expression tag
Ala 413	-	expression tag
Gln 414	-	expression tag
Ala 415	-	expression tag
Asp 416	-	expression tag
Leu 417	-	expression tag
Glu 418	-	expression tag
His 419	-	expression tag
His 420	-	expression tag
His 421	-	expression tag
His 422	-	expression tag
His 423	-	expression tag
His 424	-	expression tag

Contents of the asymmetric unit

Polymers	Number of chains	1
	Total formula weight	44299.5
Non-Polymers*	Number of molecules	3
	Total formula weight	220.2
All*	Total formula weight	44519.7

*Water molecules are not included.