GO_REF:0000002

Gene Ontology annotation through association of InterPro records with GO terms

GO_REF:0000003

Gene Ontology annotation based on Enzyme Commission mapping

GO_REF:0000033

Annotation inferences using phylogenetic trees

GO_REF:0000116

Automatic Gene Ontology annotation based on Rhea mapping

GO_REF:0000122

AtSubP analysis

PMID:17886359

Members of the plant NIMA-related kinases are involved in organ development and vascularization in poplar, Arabidopsis and rice.

Seven NEK family members were identified in Arabidopsis thaliana, including NEK3 (AT5G28290).

"We retrieved seven members in Arabidopsis thaliana, nine in Populus trichocarpa and six in Oryza sativa"
Plant NEK genes are broadly expressed and involved in developmental processes.

"their expression profiles suggest their involvement in plant development processes"

PMID:21605211

NIMA-related kinases 6, 4, and 5 interact with each other to regulate microtubule organization during epidermal cell expansion in Arabidopsis thaliana.

GFP-tagged NEK3 localizes to microtubules (reported in full text Results section, not in abstract).
NEK6 directly binds microtubules in vitro and phosphorylates beta-tubulin.

"NEK6 directly binds to microtubules in vitro and phosphorylates β-tubulin"
NEK6 forms homodimers and heterodimers with NEK4 and NEK5 to regulate cortical microtubule organization.

"NEK6 homodimerizes and forms heterodimers with NEK4 and NEK5 to regulate cortical microtubule organization possibly through the phosphorylation of β-tubulins"

PMID:26354760

Structure, function, and evolution of plant NIMA-related kinases: implication for phosphorylation-dependent microtubule regulation.

Plant NEK genes diverged from a single NEK6-like ancestral gene.

"plant NEK genes are diverged from a single NEK6-like gene, which may share a common ancestor with other kinases involved in the control of microtubule organization"
NEK6 regulates cell expansion through beta-tubulin phosphorylation and microtubule destabilization.

"NEK6 of Arabidopsis thaliana regulates cell expansion and morphogenesis through β-tubulin phosphorylation and microtubule destabilization"

PMID:23072999

NIMA-related kinases regulate directional cell growth and organ development through microtubule function in Arabidopsis thaliana.

NEK6 is required for directional growth and morphogenesis, and nek4/nek5/nek6 mutants are hypersensitive to microtubule inhibitors.

"NEK6 is required for the directional growth of roots and hypocotyls, petiole elongation, cell file formation, and trichome morphogenesis"

file:ARATH/NEK3/NEK3-deep-research-bioreason-sft.md

BioReason SFT deep research prediction for NEK3

BioReason correctly identifies the NEK family domain architecture and general kinase function, but makes unsupported specific claims about pollen tube elongation and cortical microtubule bundle integrity for NEK3.

file:ARATH/NEK3/NEK3-deep-research-falcon.md

Falcon (Edison Scientific) deep research report for Arabidopsis NEK3 (At5g28290; UniProt Q8RX66)

Falcon confirms the target identity: AtNek3 maps to Arabidopsis thaliana locus At5g28290, consistent with UniProt Q8RX66 and the NEK/NIMA-related Ser/Thr kinase family.

"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."
Falcon corroborates the Ser/Thr kinase domain architecture: a conserved N-terminal catalytic kinase domain (with ATP-binding and activation-segment motifs) plus a long C-terminal non-catalytic extension.

"Plant NEKs (including AtNek3) are described as **serine/threonine protein kinases** with a conserved **N-terminal catalytic kinase domain** and a longer **C-terminal non-catalytic extension**, consistent with the UniProt domain calls (protein kinase domain; ATP-binding and activation-segment motifs)."
Falcon supports the molecular-function class (NIMA-related Ser/Thr kinase, EC 2.7.11.1) but explicitly flags that the substrate identity and specificity remain unknown for AtNek3 in the retrieved literature.

"AtNek3 is a **NIMA-related serine/threonine protein kinase** by sequence/domain architecture and family definition; reaction class is ATP-dependent phosphorylation of protein substrates (EC 2.7.11.1), but **substrate identity and specificity remain unknown** for AtNek3 based on retrieved evidence."
Falcon found no AtNek3-specific subcellular localization evidence in its corpus; localization data it retrieved concern other plant NEKs (e.g. PNek1), not AtNek3. This is a coverage gap rather than a contradiction of the GFP-NEK3 microtubule IDA (PMID:21605211).

"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."
Falcon reports an AtNek3-specific developmental expression profile: strong in root tips and relatively high in the shoot apex, preferentially associated with young leaves and vascular elements, consistent with a role in organ development and vascularization (inference from expression).

"AtNek3 shows **strong expression in root tips** and relatively high expression in the **shoot apex**; expression is preferentially associated with **young leaves and vascular elements**"
Falcon notes AtNIMA3/AtNek3 has an organ-specific transcription profile not coupled to the mitotic cell cycle, contrasting with many fungal and animal NEKs.

"organ-specific transcription profile not associated with the mitotic cell cycle"
Falcon documents that no AtNek3-specific kinase assay, substrate, or substrate specificity was found in the retrieved evidence (functional annotation at the reaction/substrate level is currently unsupported).

"no AtNek3-specific kinase assay, substrate, or substrate specificity** was found in the gathered evidence"
Falcon documents that the retrieved evidence provided no direct AtNek3 loss-of-function or overexpression phenotype in Arabidopsis; conclusions for AtNek3 remain largely inferential from family-level studies.

"did **not** provide a direct **AtNek3 loss-of-function or overexpression phenotype** in Arabidopsis"