Heptad repeat

The heptad repeat is an example of a structural motif that consists of a repeating pattern of seven amino acids:[1]

 a b c d e f g
 H P P H C P C

where H represents hydrophobic residues, C represents, typically, charged residues, and P represents polar (and, therefore, hydrophilic) residues. The positions of the heptad repeat are commonly denoted by the lowercase letters a through g.

These motifs are the basis for most coiled coils and, in particular, leucine zippers, which have predominantly leucine in the d position of the heptad repeat.[2]

References
  1. Seroski, Dillon T.; Hudalla, Gregory A. (2018). "Self-Assembled Peptide and Protein Nanofibers for Biomedical Applications". Biomedical Applications of Functionalized Nanomaterials. pp. 569–598. doi:10.1016/B978-0-323-50878-0.00019-7. ISBN 978-0-323-50878-0.
  2. Chambers P, Pringle CR, Easton AJ (1990). "Heptad repeat sequences are located adjacent to hydrophobic regions in several types of virus fusion glycoproteins". The Journal of General Virology. 71 (12): 3075–80. doi:10.1099/0022-1317-71-12-3075. PMID 2177097.
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