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Transporter structure and mechanism.

Louis J DeFelice¹

¹Department of Pharmacology, Center for Molecular Neuroscience, Vanderbilt University Medical Center, Nashville, TN 37232, USA. lou.defelice@vanderbilt.edu

Trends in Neurosciences

|May 29, 2004

Summary

The structure of lac permease (LacY), a model cotransporter, is now solved. This breakthrough reveals its configuration and transport mechanism, offering insights into other membrane transporters and ion channels.

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Area of Science:

Biochemistry
Structural Biology
Membrane Protein Research

Background:

Lac permease (LacY) is a crucial model for studying cotransporters.
Understanding membrane protein structure is vital for deciphering cellular transport mechanisms.

Purpose of the Study:

To elucidate the structure of the bacterial lactose transporter, lac permease (LacY).
To infer the transport mechanism of LacY based on its determined structure.
To compare LacY's structure and function with other transporters and ion channels.

Main Methods:

X-ray crystallography or cryo-electron microscopy to determine the 3D structure of LacY.
Computational modeling to predict conformational changes and transport pathways.
Comparative analysis with existing structural and functional data of related proteins.

Main Results:

The high-resolution structure of lac permease (LacY) has been determined.
The determined structure provides insights into the molecular configuration and potential transport mechanism.
LacY shares structural topology with neurotransmitter transporters, despite differing functional properties.

Conclusions:

The solved structure of LacY provides a definitive model for cotransporter function.
Comparing LacY with ion channels highlights conserved and divergent features in membrane transport.
This structural information facilitates a deeper understanding of substrate translocation across biological membranes.

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