| Claim/Aspect | Evidence summary | Source (author/year, journal) | URL/DOI | Notes/limitations |
|---|---|---|---|---|
| Identity | AtNek3 is explicitly identified as the Arabidopsis thaliana NIMA-related kinase family member encoded by locus **At5g28290**; the family description matches the UniProt target NEK3/Q8RX66. (pqac-00000004, pqac-00000005) | Vigneault et al., 2007, *The Plant Journal* | https://doi.org/10.1111/j.1365-313x.2007.03161.x | Confirms the correct Arabidopsis gene and distinguishes it from non-plant NEK3 proteins. |
| Domain architecture | Plant Neks, including AtNek3, are described as **serine/threonine kinases** with a conserved **N-terminal catalytic kinase domain** and a longer **C-terminal non-catalytic extension**; sequence-level evidence in the thesis shows conserved Ser/Thr kinase motifs in AtNek3. (pqac-00000004, pqac-00000003, pqac-00000006) | Vigneault et al., 2007, *The Plant Journal*; Vigneault, 2009, thesis | https://doi.org/10.1111/j.1365-313x.2007.03161.x; thesis DOI: 10.25673/202 | Strong family/domain inference, but no AtNek3-specific biochemical assay was reported in the gathered evidence. |
| Phylogenetic placement | AtNek3 clusters with the **AtNek1–AtNek3** subgroup within a **plant-specific Nek clade**, distinct from fungal and mammalian Neks; plant Neks were inferred to descend from an ancestral plant Nek. (pqac-00000001, pqac-00000006, pqac-00000014) | Vigneault et al., 2007, *The Plant Journal*; Vigneault, 2009, thesis | https://doi.org/10.1111/j.1365-313x.2007.03161.x; thesis DOI: 10.25673/202 | Evolutionary evidence supports likely conserved plant-specific function, but does not by itself establish mechanism. |
| Expression pattern in Arabidopsis organs/tissues | AtNek3 transcripts are reported as **strong in root tips** and **relatively high in the shoot apex**, with expression preferentially associated with **young leaves** and **vascular elements**; AtNek3 expression is **very low in hypocotyl, xylem, and cork extracts** and decreases strongly in **senescent leaves**. (pqac-00000000, pqac-00000001, pqac-00000014) | Vigneault et al., 2007, *The Plant Journal* | https://doi.org/10.1111/j.1365-313x.2007.03161.x | Evidence is expression-based and tissue-level; it does not prove subcellular localization or direct function. |
| Cell-cycle association | A dissertation summary states that **AtNIMA3/AtNek3** shows an **organ-specific transcription profile not associated with the mitotic cell cycle**, contrasting with some NEKs in fungi/animals. (pqac-00000007) | Agueci, 2010, dissertation | https://doi.org/10.25673/202 | Mapping to At5g28290/Q8RX66 is inferential within the gathered evidence; no direct AtNek3 cell-cycle assay was cited here. |
| Inferred biological role | Based on expression in root tips, shoot apex, young leaves, and vascular tissues, the authors infer that AtNek3 is involved more in **organ development, tissue differentiation, and vascularization** than in core mitotic control. (pqac-00000000, pqac-00000001) | Vigneault et al., 2007, *The Plant Journal* | https://doi.org/10.1111/j.1365-313x.2007.03161.x | This is an inference from comparative expression and phylogeny; no direct AtNek3 mutant or overexpression phenotype was provided. |
| Subcellular localization | No AtNek3-specific experimental subcellular localization was identified in the gathered evidence. Localization data in the available literature concern other plant NEKs such as PNek1, not AtNek3. (pqac-00000002) | Vigneault, 2009, thesis | thesis DOI: 10.25673/202 | Important evidence gap: localization for AtNek3 remains unresolved in the retrieved sources. |
| Enzymatic activity / substrates | Although AtNek3 is classified as a serine/threonine protein kinase by family/domain features, **no AtNek3-specific kinase assay, substrate, or substrate specificity** was found in the gathered evidence. (pqac-00000003, pqac-00000006) | Vigneault, 2009, thesis | thesis DOI: 10.25673/202 | Functional annotation at the reaction/substrate level is currently unsupported by direct evidence in the retrieved literature. |
| Mutant or overexpression phenotype | The gathered evidence did **not** provide a direct **AtNek3 loss-of-function or overexpression phenotype** in Arabidopsis. Family-level papers discuss developmental functions for plant NEKs, but AtNek3-specific phenotype data were not reported in the retrieved excerpts. (pqac-00000000, pqac-00000004) | Vigneault et al., 2007, *The Plant Journal* | https://doi.org/10.1111/j.1365-313x.2007.03161.x | Another major evidence gap; conclusions for AtNek3 remain largely inferential. |


*Table: This table summarizes what the gathered evidence supports for Arabidopsis thaliana NEK3/AtNek3 (At5g28290; UniProt Q8RX66). It highlights that identity, kinase-family assignment, and expression-based developmental inferences are supported, while direct localization, substrates, and phenotype evidence remain limited.*