Biochemistry I   Spring & Fall Terms

Super Secondary Structure Motifs: b-Helix Proteins

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  Load these b-Helices
  7 (1QRE)
  8 (2PEC)
  10 (1CZF)
  11 (1HV9)
  12 (1TYU)
  17 (1DAB)

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b-Helix Structures Gallery
The b-helix class of proteins have their parallel b-strands arranged in a helical repeat with three strands/turn. They differ in the number of "turns" found in the motif and in the extent to which a-helices and other structures are present. The initial model shown is carbonic anhydrase; it has seven turns. The similarities and differences can be seen by viewing these six examples listed above by # turns (and PDB ID):
# Turns PDB ID Protein
7 1QRE Carbonic Anhydrase from Methanosarcina thermophila
8 2PEC Pectate Lyase C from Erwinia chrysanthemi
10 1CZF Endopolygalacturonase II from Aspergillus niger
11 1HV9 Escherichia coli GlmU
12 1TYU Phage P22 Tailspike Protein
17 1DAB Bordetella Pertussis Virulence Factor P.69 Pertactin
The above listing also shows that these proteins perform a wide variety of functions in diverse organisms.
Viewing Tips:
1. Color the displays by Group to see the course of the polypeptide chain from N- to C-terminus.
2. Several of these proteins have important ligands and/or prosthetic groups; you can visualize them by selecting Ligand (under Hetero), followed by Spacefill, and then CPK.

Back to the Protein Structure List.

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8.21.04