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Related Concept Videos

Single-pass Transmembrane Proteins01:25

Single-pass Transmembrane Proteins

Integral membrane proteins are tightly associated with the cell membrane and play a crucial role in cell communication, signaling, adhesion, and transport of the molecules. Some integral membrane proteins are present only in the membrane monolayer. For example, the enzyme fatty acid amide hydrolase is present in the cytoplasmic side of the membrane monolayer. In contrast, another type of integral membrane protein, also known as a transmembrane protein, spans across the membrane. Transmembrane...
Insertion of Multi-pass Transmembrane Proteins in the RER01:29

Insertion of Multi-pass Transmembrane Proteins in the RER

The rough ER membrane synthesizes, assembles, and embeds transmembrane proteins in diverse topologies. These proteins function as transporters or channels and can remain in the ER membrane or are sent to the Golgi complex, lysosome, and cell membrane.
The multipass transmembrane proteins are the type IV integral membrane proteins with multiple topogenic sequences determining their spatial arrangement in the ER membrane. Nearly all multipass proteins lack a cleavable signal sequence and use...
Insertion of Single-pass Transmembrane Proteins in the RER01:26

Insertion of Single-pass Transmembrane Proteins in the RER

Integral membrane proteins are proteins adhered to the lipid bilayer of a cell organelle or membrane. They can be of two types: transmembrane integral proteins that span the lipid bilayer and monotopic proteins that are attached to either side of the membrane but do not pass through it.
Integral transmembrane proteins possess transmembrane and extra membrane domains. The transmembrane domains are primarily made of 20-25 hydrophobic amino acids arranged in a helical secondary confirmation. These...
Multi-pass Transmembrane Proteins and β-barrels01:09

Multi-pass Transmembrane Proteins and β-barrels

In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
α-Helix containing multi-pass transmembrane proteins
Multi-pass transmembrane proteins such as G-protein-linked receptors (GPCRs) and...
Introduction to Membrane Proteins01:16

Introduction to Membrane Proteins

The cell membrane, or plasma membrane, is an ever-changing landscape. It is described as a fluid mosaic where various macromolecules are embedded in the phospholipid bilayer. Among the macromolecules are proteins. The protein content varies across cell types. For example, mitochondrial inner membranes contain ~76% protein content, while myelin contains ~18% protein content. Individual cells contain many types of membrane proteins—red blood cells contain over 50—and different cell types have...
Membrane Asymmetry Regulating Transporters01:19

Membrane Asymmetry Regulating Transporters

Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...

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Updated: Jun 2, 2026

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies
07:31

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies

Published on: September 1, 2023

Understandable learning machine system design for transmembrane or embedded membrane segments prediction.

Hae-Jin Hu1, Robert W Harrison, Phang C Tai

  • 1Department of Computer Science, Georgia State University, Atlanta, GA 30303, USA. haejin.hu@gmail.com

International Journal of Data Mining and Bioinformatics
|April 16, 2011
PubMed
Summary
This summary is machine-generated.

A new hybrid machine learning model improves transmembrane segment prediction by combining rule-based classifiers with Support Vector Machines (SVM). This approach offers biologically meaningful rules while maintaining high performance, proving robust for TM/EM segment prediction.

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Area of Science:

  • Bioinformatics
  • Computational Biology
  • Machine Learning

Background:

  • Traditional black-box machine learning models face challenges in accurately predicting transmembrane (TM) segments.
  • Existing methods lack biologically meaningful interpretations for TM/EM segment prediction.

Purpose of the Study:

  • To enhance the accuracy and interpretability of transmembrane (TM) segment prediction.
  • To develop a hybrid model combining association rule-based classifiers with Support Vector Machines (SVM).

Main Methods:

  • Modified the CPAR (Classification based on Association Rule) classifier for TM segment prediction.
  • Integrated the modified CPAR with SVM to create a hybrid prediction scheme.
  • Evaluated model performance using Receiver Operating Characteristic (ROC) curve analysis and sturdiness tests.

Main Results:

  • The hybrid scheme provides biologically meaningful rules for TM/EM segment prediction.
  • Performance of the hybrid model is comparable to that of SVM alone.
  • The new scheme demonstrates robustness and competence in TM/EM segment prediction.

Conclusions:

  • The hybrid CPAR-SVM model offers an effective and interpretable approach for TM/EM segment prediction.
  • This method advances the field of protein structure prediction and bioinformatics.
  • A prediction server is publicly available for broader research application.