Amino acid sequence of bacteriorhodopsin.

Area of Science:

• Biochemistry
• Molecular Biology
• Protein Chemistry

Background:

• Bacteriorhodopsin is a crucial protein found in purple membranes.
• Understanding its structure is key to deciphering its function.

Purpose of the Study:

• To determine the complete primary amino acid sequence of bacteriorhodopsin.
• To provide a definitive sequence for future research and comparisons.

Main Methods:

• Hydrophobic protein fragment separation using gel permeation and reverse-phase HPLC.
• Amino acid sequencing via automatic Edman degradation and mass spectrometry.
• Fragment ordering using CNBr and N-bromosuccinimide cleavage analysis.

Main Results:

• The complete primary structure of bacteriorhodopsin, comprising 248 amino acid residues, was elucidated.
• A detailed amino acid sequence was established, identifying specific residue positions.
• The determined sequence includes an additional tryptophan at position 138 compared to previous reports.

Conclusions:

• The complete primary structure of bacteriorhodopsin has been definitively determined.
• This detailed sequence provides a foundation for understanding bacteriorhodopsin's structure-function relationship.
• The findings offer a revised and more accurate sequence for this important membrane protein.