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A Numbering System for MFS Transporter Proteins.

Joanna Lee1, Zara A Sands2, Philip C Biggin1

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Summary

The Major Facilitator Superfamily (MFS) comprises numerous membrane transporters. This study introduces conserved contact points and a numbering scheme to improve homology modeling for these vital proteins.

Keywords:
LacYalternating accesshomology modelingtransmembranetransport

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biology

Background:

  • The Major Facilitator Superfamily (MFS) is a large class of secondary active transporters with a conserved 12-transmembrane helix motif.
  • MFS transporters are crucial for physiological processes and represent significant drug targets.
  • Limited crystal structures necessitate homology modeling for understanding MFS protein function.

Purpose of the Study:

  • To enhance homology modeling of MFS transporters.
  • To address challenges in modeling MFS proteins with low sequence identity to known structures.
  • To provide tools for interpreting experimental data related to MFS proteins.

Main Methods:

  • Analysis of available MFS sequences and structural information.
  • Identification of conserved contact points across MFS proteins.
  • Development of a standardized numbering scheme for MFS transmembrane regions.

Main Results:

  • A series of conserved contact points were identified to guide MFS homology modeling.
  • A novel numbering scheme was proposed for consistent cross-comparison of MFS models.
  • The proposed methods aim to improve the accuracy and interpretability of MFS structural models.

Conclusions:

  • Conserved contact points and a standardized numbering scheme facilitate more reliable homology modeling of MFS transporters.
  • These tools are essential for advancing research on MFS proteins, given the scarcity of experimental structures.
  • Improved MFS models will aid in understanding physiological roles and developing targeted therapeutics.