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Purification of hydrophobic integral membrane proteins from Mycoplasma hyopneumoniae by reversed-phase
R P Lee1, S W Doughty, K Ashman
1Department of Parasitology, University of Queensland, St. Lucia, Australia.
Abstract:
A general and practical approach for isolating, fractionating and purifying large quantities of outer membrane hydrophobic proteins is described as applied to membrane proteins of Mycoplasma hyopneumoniae. Outer membrane proteins were extracted with Triton X-114 detergent and were precipitated from the detergent phase with 90% ethanol. Precipitated proteins were dissolved in 65% formic acid and separated by RP-HPLC using a formic acid-acetonitrile gradient. A M(r) 48 000 protein was obtained in high yield and at greater than 90% purity by optimisation of parameters for RP-HPLC. The combination of Triton X-114 extraction followed by high resolution RP-HPLC is a novel and rapid procedure for the isolation and purification of hydrophobic proteins. Proteins purified by this approach were suitable for subsequent characterisation by direct sequencing of the amino terminus as well as generation of peptides by digestion with cyanogen bromide.
Insights
Researchers developed a novel method to isolate and purify hydrophobic outer membrane proteins from Mycoplasma hyopneumoniae. This technique combines Triton X-114 extraction and RP-HPLC for high-yield, high-purity protein isolation.
Area of Science:
- Proteomics
- Biochemistry
- Microbiology
Background:
- Outer membrane proteins are crucial for bacterial structure and function.
- Efficient isolation of hydrophobic membrane proteins remains challenging.
- Mycoplasma hyopneumoniae outer membrane proteins are targets for vaccine development.
Purpose of the Study:
- To develop a general and practical method for large-scale isolation and purification of hydrophobic outer membrane proteins.
- To apply this method to Mycoplasma hyopneumoniae membrane proteins.
- To obtain purified proteins suitable for further characterization.
Main Methods:
- Extraction of outer membrane proteins using Triton X-114 detergent.
- Precipitation of proteins from the detergent phase with 90% ethanol.
- Separation and purification using reversed-phase high-performance liquid chromatography (RP-HPLC) with a formic acid-acetonitrile gradient.
Main Results:
- A M(r) 48,000 protein was isolated with high yield and >90% purity.
- Optimized RP-HPLC parameters were crucial for achieving high purity.
- The combined Triton X-114 extraction and RP-HPLC method is rapid and effective.
Conclusions:
- The described method provides a novel, rapid, and efficient approach for hydrophobic protein purification.
- Purified proteins are suitable for direct amino-terminal sequencing and peptide generation.
- This technique facilitates further proteomic analysis of bacterial outer membranes.
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