Carbohydrate Transport by Group Translocation: The Bacterial Phosphoenolpyruvate: Sugar Phosphotransferase System.

Jeckelmann, Jean-Marc; Erni, Bernhard (2019). Carbohydrate Transport by Group Translocation: The Bacterial Phosphoenolpyruvate: Sugar Phosphotransferase System. In: Kuhn, Andreas (ed.) Bacterial Cell Walls and Membranes. Subcellular Biochemistry: Vol. 92 (pp. 223-274). Boston: Springer 10.1007/978-3-030-18768-2_8

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The Bacterial Phosphoenolpyruvate (PEP) : Sugar Phosphotransferase System (PTS) mediates the uptake and phosphorylation of carbohydrates, and controls the carbon- and nitrogen metabolism in response to the availability of sugars. PTS occur in eubacteria and in a few archaebacteria but not in animals and plants. All PTS comprise two cytoplasmic phosphotransferase proteins (EI and HPr) and a species-dependent, variable number of sugar-specific enzyme II complexes (IIA, IIB, IIC, IID). EI and HPr transfer phosphorylgroups from PEP to the IIA units. Cytoplasmic IIA and IIB units sequentially transfer phosphates to the sugar, which is transported by the IIC and IICIID integral membrane protein complexes. Phosphorylation by IIB and translocation by IIC(IID) are tightly coupled. The IIC(IID) sugar transporters of the PTS are in the focus of this review. There are four structurally different PTS transporter superfamilies (glucose, glucitol, ascorbate, mannose) . Crystal structures are available for transporters of two superfamilies: bcIICmal (MalT, 5IWS, 6BVG) and bcIICchb (ChbC, 3QNQ) of B. subtilis from the glucose family, and IICasc (UlaA, 4RP9, 5ZOV) of E. coli from the ascorbate superfamily . They are homodimers and each protomer has an independent transport pathway which functions by an elevator-type alternating-access mechanism. bcIICmal and bcIICchb have the same fold, IICasc has a completely different fold. Biochemical and biophysical data accumulated in the past with the transporters for mannitol (IICBAmtl) and glucose (IICBglc) are reviewed and discussed in the context of the bcIICmal crystal structures. The transporters of the mannose superfamily are dimers of protomers consisting of a IIC and a IID protein chain. The crystal structure is not known and the topology difficult to predict. Biochemical data indicate that the IICIID complex employs a different transport mechanism . Species specific IICIID serve as a gateway for the penetration of bacteriophage lambda DNA across, and insertion of class IIa bacteriocins into the inner membrane. PTS transporters are inserted into the membrane by SecYEG translocon and have specific lipid requirements. Immunoelectron- and fluorescence microscopy indicate a non-random distribution and supramolecular complexes of PTS proteins.

Item Type:

Book Section (Book Chapter)

Division/Institute:

08 Faculty of Science > Other Institutions > Emeriti, Faculty of Science
04 Faculty of Medicine > Pre-clinic Human Medicine > Institute of Biochemistry and Molecular Medicine

UniBE Contributor:

Jeckelmann, Jean-Marc and Erni, Bernhard

Subjects:

500 Science > 570 Life sciences; biology
600 Technology > 610 Medicine & health

ISSN:

0306-0225

ISBN:

978-1-4615-6514-7

Series:

Subcellular Biochemistry

Publisher:

Springer

Language:

English

Submitter:

Barbara Järmann-Bangerter

Date Deposited:

27 Sep 2019 12:25

Last Modified:

23 Oct 2019 09:20

Publisher DOI:

10.1007/978-3-030-18768-2_8

PubMed ID:

31214989

Uncontrolled Keywords:

Bacteriocin Bacteriophage lambda EIIC component EIID component Elevator mechanism Energy coupling Glucose Mannitol Mannose PTS Subcellular localization Sugar transport

BORIS DOI:

10.7892/boris.133498

URI:

https://boris.unibe.ch/id/eprint/133498

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