Antigen 43 causes adherence of E.coli and drives flocculation, or cell adhesion. 

Example of Beta Barrel: Antigen 43

Beta barrels are extended beta sheets that form into a roll or a barrel shape. The beta strands are linked with loop structures.

Below is the beta barrel of the human retinol binding protein. PDB ID: 1RBP

Grand Valley State University

Tertiary structures of proteins can be further subdivided based on their secondary structures. Proteins can be classified as alpha, beta and alpha/beta and further understood by their topology or how the secondary structure is connected. 
Key secondary classification:
- Beta barrels

Classification based on Secondary Protein Topology

Voet, D., Voet, J. G., & Pratt, C. W. (2013). Chapter 6: Proteins: Three-Dimensional Structure. In Fundamentals of biochemistry: Life at the molecular level (4th ed., pp. 127-175). Hoboken, NJ: Wiley. Retrieved January 05, 2021, from archive.org.

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