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The plant-specific insert (PSI) or plant-specific sequence (PSS) is an independent domain, exclusively found in plants, consisting of approximately 100 residues, found on the C-terminal lobe on some aspartic proteases (AP) called phytepsins. The PSI, as an independent entity separate from its parent AP, is homologous to saposin and belongs to the saposin-like protein family (SAPLIP).

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  • The plant-specific insert (PSI) or plant-specific sequence (PSS) is an independent domain, exclusively found in plants, consisting of approximately 100 residues, found on the C-terminal lobe on some aspartic proteases (AP) called phytepsins. The PSI, as an independent entity separate from its parent AP, is homologous to saposin and belongs to the saposin-like protein family (SAPLIP). Although the PSI is grouped along proteins in the SAPLIP family, the PSI does not contain a proper saposin-like domain. This is due to a circular permutation of the N- and C-termini of the PSI, in which the termini are "swapped". This has led to the PSI being termed a "swaposin" (a play-on-words of "swap" and "saposin") although the tertiary structure still remains homologous to saposin and other members of the SAPLIP family. (en)
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  • Structure of the saposin-like domain of a plant aspartic proteinase (en)
dbp:name
  • Solanum tuberosum Aspartic Protease 3 Plant-Specific Insert (en)
dbp:organism
  • Solanum tuberosum (en)
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  • 3 (xsd:integer)
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  • StAP_PSI (en)
dbp:uniprot
  • Q6B9W9 (en)
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  • The plant-specific insert (PSI) or plant-specific sequence (PSS) is an independent domain, exclusively found in plants, consisting of approximately 100 residues, found on the C-terminal lobe on some aspartic proteases (AP) called phytepsins. The PSI, as an independent entity separate from its parent AP, is homologous to saposin and belongs to the saposin-like protein family (SAPLIP). (en)
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  • Plant-specific insert (en)
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