IUBMB Enzyme Nomenclature


Accepted name: ABC-type thiamine transporter

Reaction: ATP + H2O + thiamine-[thiamine-binding protein][side 1] = ADP + phosphate + thiamine[side 2] + [thiamine-binding protein][side 1]

Other name(s): thiamin transporting ATPase; thiamine ABC transporter; thiamin ABC transporter; thiamine transporting ATPase; thiBPQ (gene names)

Systematic name: ATP phosphohydrolase (ABC-type, thiamine-importing)

Comments: ATP-binding cassette (ABC) type transporter, characterized by the presence of two similar ATP-binding domains/proteins and two integral membrane domains/proteins. The enzyme, characterized from the bacterium Salmonella typhimurium, is a heterodimeric complex that interacts with an extracytoplasmic substrate binding protein and functions to import thiamine, thiamine monophosphate and thiamine diphosphate.

Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number:


1. Webb, E., Claas, K. and Downs, D. thiBPQ encodes an ABC transporter required for transport of thiamine and thiamine pyrophosphate in Salmonella typhimurium. J. Biol. Chem 273 (1998) 8946-8950. [PMID: 9535878]

[EC created 2019]

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