Interactions in the pollen-specific receptor-like kinases-containing signaling network

Löcke, Susanne; Fricke, Inka; Mucha, Elena; Humpert, Marie-Luise; Berken, Antje

doi:10.1016/j.ejcb.2010.08.002

Cited by 23 publications

(22 citation statements)

References 38 publications

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“…Besides the RLK-RopGEF-ROP cascade, active form of a tomato ROP (LeROP) has been proven to directly interact with LePRKs, indicating LePRKs function as ROP effectors as well. 37 Whether the PRK activation on RopGEFs requires the signaling feedback through the interaction between activated ROP and the PRKs will be an exciting point to uncover.…”

mentioning

confidence: 99%

Novel ABP1-TMK auxin sensing system controls ROP GTPase-mediated interdigitated cell expansion in Arabidopsis

Chen

Yang

2014

Small GTPases

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mentioning

confidence: 99%

Novel ABP1-TMK auxin sensing system controls ROP GTPase-mediated interdigitated cell expansion in Arabidopsis

Chen

Yang

2014

Small GTPases

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“…The biological significance of this potential regulatory step is as yet unknown and the kinase that may carry out the phosphorylation is not yet identified. In certain cases, the direct binding of ROPs to the kinase domain of receptor kinases could be observed [40], but no direct phosphorylation of ROPs by these kinases has been reported so far. The human Rac1 protein is phosphorylated on the corresponding residue by the AKT kinase and this phosphorylation is inhibitory [78].…”

Section: Non-receptor Protein Kinases Upstream Of Rop Gtpase Signallingmentioning

confidence: 99%

“…2) and differ from each other in several aspects. While the full-length AtRopGEF1 protein is not active in vitro, due to auto-inhibition by its own C-terminal region [15], this is not the case with the tomato KINASE PARTNER PROTEIN and AtRopGEF9 (which are both closely related to AtRopGEF12) [40]. The C-terminal regions of these two proteins exert auto-inhibitory activity only in vivo, not in vitro [40].…”

Section: Pollen Receptor Kinasesmentioning

confidence: 99%

“…Based on this ROP-conformation-specific interaction, which is a characteristic of ROP-effector kinases (e.g., [43 46]), the possibility was raised that the activity of PRKs might depend on an interaction with active GTP-bound ROPs [40]. Based on the strong interaction between AtRopGEF1 and AtROP1-GTP [15], an alternative hypothesis has also been developed.…”

Section: Pollen Receptor Kinasesmentioning

confidence: 99%

“…In addition to the indirect link between receptor-like kinases and ROPs through RopGEFs, the direct interaction of GTP-bound active tomato LeROP with a tomato PRK has been demonstrated [40]. Based on this ROP-conformation-specific interaction, which is a characteristic of ROP-effector kinases (e.g., [43 46]), the possibility was raised that the activity of PRKs might depend on an interaction with active GTP-bound ROPs [40].…”

Section: Pollen Receptor Kinasesmentioning

confidence: 99%

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Signals fly when kinases meet Rho-of-plants (ROP) small G-proteins

Fehér

Lajkó

2015

Plant Science

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Rho-type small GTP-binding plant proteins function as two-state molecular switches in cellular signalling. There is accumulating evidence that RHO-OF-PLANTS (ROP) signalling is positively controlled by plant receptor kinases, through the ROP GUANINE NUCLEOTIDE EXCHANGE FACTOR proteins. These signalling modules regulate cell polarity, cell shape, hormone responses, and pathogen defence, among other things. Other ROP-regulatory proteins might also be subjected to protein phosphorylation by cellular HighlightsVarious types of receptor-like kinases positively regulate ROP signalling.The receptor kinase-RopGEF-ROP signalling module is used in a wide variety of cellular processes. 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 ROPs and their regulators are likely to be subjected to regulation by protein phosphorylation.ROPs might play a role in directly and indirectly activating downstream kinase signalling.

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Arabidopsis pollen extensins LRX are required for cell wall integrity during pollen tube growth

et al. 2018

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Proper cell wall assembly is crucial during pollen tube growth. Leucine-rich repeat extensins (LRXs) are extracellular glycoproteins which belong to the hydroxyproline-rich glycoprotein (HRGP) family. They contain a conserved N-terminal leucine-rich repeat (LRR) domain and a highly variable C-terminal extensin domain. Here, we characterized four LRX proteins (LRX8 through LRX11) from pollen of Arabidopsis thaliana. To investigate the role of LRX8-LRX11 in pollen germination and pollen tube growth, multiple T-DNA lrx mutants were obtained. The lrx mutants display abnormal pollen tubes with an irregular deposition of callose and pectin. They also show serious alterations in pollen germination and segregation ratio. Our results suggest that LRXs are involved in ensuring proper cell wall assembly during pollen tube growth.

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Interactions in the pollen-specific receptor-like kinases-containing signaling network

Cited by 23 publications

References 38 publications

Novel ABP1-TMK auxin sensing system controls ROP GTPase-mediated interdigitated cell expansion in Arabidopsis

Novel ABP1-TMK auxin sensing system controls ROP GTPase-mediated interdigitated cell expansion in Arabidopsis

Signals fly when kinases meet Rho-of-plants (ROP) small G-proteins

Arabidopsis pollen extensins LRX are required for cell wall integrity during pollen tube growth

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