List of 63 S5 unobserved SSPs

Our search found all SSPs from S1 to S4 to have at least one motif hit in the PDB. However, 218 S5 SSPs did not have a single motif hit in the current PDB (unobserved SSPs). These unobserved SSPs highlight an interesting theoretical question about fold space: are SSPs that are absent in nature able to fold? Among the unobserved SSPs, 155 have unpaired β-strand(s) and are thereby not considered as isolated domains, since they require additional elements fold. Therefore, we focus on outlining the properties of the remaining 63 unobserved SSPs that could potentially serve as protein design targets. We investigated the violations of general protein folding rules for each of these 63 SSPs. The diagrams of these 63 SSPs are shown below.

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