PMID:18923393

The Phaeodactylum genome reveals the evolutionary history of diatom genomes.

The genome sequence of P. tricornutum strain CCAP 1055/1, from which HSP20A (PHATRDRAFT_35158) was predicted.

PMID:29983375

Engineering of a Polydisperse Small Heat-Shock Protein Reveals Conserved Motifs of Oligomer Plasticity.

sHSPs bind partially and globally unfolded client proteins. The archaeal Hsp16.5 forms ordered 24-subunit oligomers, and engineering it showed conserved motifs that govern oligomer plasticity.

PMID:11576425

At-HSP17.6A, encoding a small heat-shock protein in Arabidopsis, can enhance osmotolerance upon overexpression.

In vitro chaperone activity of a PTHR11527 member, Arabidopsis cytosolic class II sHSP HSP17.6A.

file:PHATC/B7FXQ8/B7FXQ8-deep-research-falcon.md

Deep research report on HSP20A (B7FXQ8) in P. tricornutum

Comprehensive literature synthesis on sHSP family biology and P. tricornutum thermal stress response systems.

file:PHATC/B7FXQ8/B7FXQ8-hypotheses/core-function-1-go-0051082/openscientist.md

OpenScientist hypothesis investigation - unfolded protein binding as core function of HSP20A

GO:0051082 (unfolded protein binding) is officially obsolete. Recommended replacement is GO:0044183 (protein folding chaperone), following precedent of 25 reviewed sHSPs in Swiss-Prot. B7FXQ8 has zero GO annotations in any database; only one of seven P. tricornutum sHSPs has any GO annotation.
All seven independent domain databases (CDD, InterPro, Pfam, PROSITE, PANTHER, SMART, Gene3D) classify B7FXQ8 as an sHSP. The IXI motif (IAI at position 150) is present, supporting oligomeric assembly capability.

file:PHATC/B7FXQ8/B7FXQ8-bioinformatics/RESULTS.md

B7FXQ8 (HSP20A) phylogenetic placement among small heat shock proteins

B7FXQ8 is in PTHR11527 at family level only, and P. tricornutum is not a PANTHER genome. In an ACD neighbour-joining tree it groups with T. pseudonana B8CD87 (PTHR11527:SF175). No characterised protein falls inside that diatom lineage. The PAINT family root PTN000163021 carries protein folding, response to heat, response to salt stress, response to H2O2 and protein complex oligomerization.