The Membrane Attack Complex/Perforin Superfamily

Area of Science:

• Biochemistry
• Evolutionary Biology
• Structural Biology

Background:

• The membrane attack complex/perforin (MACPF) superfamily is a diverse protein group involved in various biological processes.
• Previous studies suggested evolutionary relationships based on tertiary structures.

Purpose of the Study:

• To investigate evolutionary relationships within the MACPF superfamily using primary structure analyses.
• To identify and classify members of the MACPF superfamily, including MACPF, CDC, and pleurotolysin B families.

Main Methods:

• Comparative analysis of protein primary structures.
• Expansion of protein families against a large database.
• Hidden Markov model comparisons.
• Clustering analyses.

Main Results:

• Evolutionary relationships within the MACPF superfamily are supported by primary structure analyses.
• The superfamily comprises the MACPF, cholesterol-dependent cytolysin (CDC), and pleurotolysin B families.
• Clustering analyses revealed distinct groupings for CDC, MACPF subfamilies, and pleurotolysin B.
• MACPF superfamily members are found across eukaryotic, bacterial, and archaeal domains with diverse architectures.

Conclusions:

• Primary structure analysis provides robust support for evolutionary relationships within the MACPF superfamily.
• The study clarifies the classification and evolutionary divergence of MACPF, CDC, and pleurotolysin B families.
• The developed strategy can aid in classifying other divergent protein families.