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Phosphorylation controls spatial and temporal activities of motor-PRC1 complexes to complete mitosis

Agata Gluszek-Kustusz, Benjamin Craske, Thibault Legal, Toni McHugh, Julie P.I. Welburn

Preprint posted on 11 March 2023 https://www.biorxiv.org/content/10.1101/2023.03.11.531660v1

Getting to the right place at the right time: Phosphorylation regulates jumping of kinesins between spindles during mitosis

Selected by Divya Pathak, Barbora Knotkova

Categories: biochemistry, biophysics, cell biology

Background:

Mitosis is an essential biological process involving the division of one eukaryotic cell into two daughter cells. Genetic information encoded on chromosomes has to be copied and divided equally between the two daughter cells, in a well-choreographed, spatiotemporally regulated process that involves the coordination between multiple protein players. One of the key players in mitosis are microtubule filaments. Microtubules self-organise into three different structures during mitosis: 1) the bipolar mitotic spindle (in early mitosis) which attaches to kinetochores on chromosomes to pull them apart, 2) astral microtubules which mediate spindle positioning and 3) the central spindle which support cytokinesis in late mitosis [1] (Figure 1).

This preprint largely focuses on central spindle organisation during the metaphase to anaphase transition, which is mediated by microtubule-associated proteins and motor proteins. PRC1, a microtubule-associated protein, is the protagonist in central spindle formation. PRC1 functions as a homodimer of two 70kDa polypeptides. It’s central domain induces microtubule bundling while the N-terminal part of the protein interacts with the kinesin 4 motor Kif4A [2-4]. However, the exact molecular details underlying the interaction of PRC1 with motor proteins as well as their cooperation in central spindle assembly are not well characterised yet. Kif4A is responsible for the precise localization of PRC1 to the central region of the central spindle. However, the N-terminus of PRC1 has a broader functionality as full length PRC1 is restricted in its localization even after Kif4a depletion [5].

In this preprint Gluszek-Kustusz and colleagues uncover that two different motors – Kif4A and CENP-E – bind to PRC1 using a similar mechanism (hydrophobic motifs with reduced affinity upon phosphorylation) and address the role of mitotic kinases in spatiotemporally regulating the interaction between CENP-E and PRC1 during the metaphase-anaphase transition.

Fig 1: Schematic diagram showing the metaphase to anaphase transition, during which mitotic kinesins Kif4A (blue) and CENP-E (orange) relocate from kinetochores on chromosomes (pink) to PRC1 (black) on overlapping microtubules. (Adapted from preprint under CC-BY 4.0 International License)

 

Key findings:

  • There is a unifying theme for PRC1-motor protein interactions: CENP-E interacts with the N-terminal of PRC1 in a similar manner as Kif4A.By aligning the CENP-E protein sequences from various species, the authors identified hydrophobic motifs required for PRC1 binding present at the C-terminal region of the protein. Both KIF4A and CENP-E use two hydrophobic motifs to bind PRC1. Using an AlphaFold2 prediction, the CENP-E binding site at the N-terminus of PRC1 could be identified, and then experimentally confirmed.

 

  • The CENP-E-PRC1 complex, but neither of these proteins alone, was sufficient to slide microtubules in an in vitro assay, in the absence of other cytosolic proteins.

 

  • Phosphorylation of CENP-E inhibits its PRC1 binding and microtubule sliding.During (pro)metaphase, CENP-E localises to unattached kinetochores of chromosomes [6, 7] but rapidly changes its localisation to the central spindle in anaphase [8, 9]. This translocation from kinetochore to central spindle is accompanied by rapid dephosphorylation of CENP-E, which is phosphorylated in metaphase. Gluszek-Kustusz and colleagues identified the key serine residues flanking the hydrophobic PRC1 binding motifs whose dephosphorylation increases CENP-E’s affinity for PRC1. CENP-E phosphomimetic mutants therefore lost localisation to interpolar microtubules during metaphase, and to the midzone during anaphase. Phosphodead mutants on the other hand were still able to bind to overlapping microtubules at the midzone.

 

  • PCR1-motor interactions are necessary for cytokinesis.To investigate the importance of PRC1-CENP-E interaction in mitosis, Gluszek-Kustusz and team generated new HeLa cell lines expressing GFP-tagged PRC1 with or without mutations in the CENP-E binding site. At the same time, endogenous PRC1 could be inducibly knocked-out. While cells with GFP-PRC1 behaved like wild-type, the mutant GFP-PRC1 cells lacked a proper central spindle, CENP-E did not localise to the midzone and chromosomes were hypersegregated. This phenotype is similar to cells depleted for PRC1 [10]. As time progressed, cells containing only the mutant PRC1 became more polyploid than the control cells, indicating that recruitment of motor proteins to PRC1 is essential for proper cytokinesis.
Fig 2: (A) Cartoon representation of the experimental setup of in vitro microtubule sliding assay. (B) Representative kymograph depicting microtubule-microtubule sliding with 2.5 nM PRC1 and 50 nM full-length CENP-E (X-axis represents distance and Y-axis represents time). (C) An example kymograph showing free microtubule sliding until it stalls upon reaching the end of the immobilized microtubule. Once the “purple” microtubule reaches the end of the “yellow” microtubule, it stalls. (D) Graph shows quantified velocities of 28 microtubules. (Adapted from the preprint under CC-BY 4.0 International License)

 

 

What we like about the preprint: 

This is the first study uncovering the key molecular mechanism that mediates the switching of CENP-E from kinetochores in the mitotic spindle to the midzone of the central spindle during the metaphase to anaphase transition.

We liked that the manuscript was very clear and logical, and easy for us (non-experts in the field) to follow. Scientifically, we especially enjoyed how the authors could figure out molecular details, including regulations through post-translational modifications, underlying an important protein-protein interaction. We also recognise the effort of proving the principles initially found in vitro, in live cells.

 

Questions for the authors:

  1. Is it known if CENP-E phosphorylation is required for its association with kinetochores during metaphase, or is phosphorylation used just to inhibit PRC1 interaction?
  2. Do CENP-E and KIF4A compete for PRC1 binding – does the PRC11-168 mutation also inhibit binding to KifA4? Do CENP-E and KIF4A perform redundant functions during anaphase in sliding antiparallel microtubules?
  3. Are Kif4A and CENP-E under regulation by the same protein kinase? Or are they phosphorylated/dephosphorylated at different times during mitosis to prevent competition?
  4. What’s the role of Aurora kinases and BubR1 kinases as they switch regulating CENP-E spatiotemporally?

 

REFERENCES: 

  1.         Glotzer, M., The 3Ms of central spindle assembly: microtubules, motors and MAPs. Nat Rev Mol Cell Biol, 2009. 10(1): p. 9-20.
  2.         Bieling, P., I.A. Telley, and T. Surrey, A minimal midzone protein module controls formation and length of antiparallel microtubule overlaps. Cell, 2010. 142(3): p. 420-32.
  3.         Subramanian, R., et al., Insights into antiparallel microtubule crosslinking by PRC1, a conserved nonmotor microtubule binding protein. Cell, 2010. 142(3): p. 433-43.
  4.         Douglas, M.E. and M. Mishima, Still entangled: assembly of the central spindle by multiple microtubule modulators. Semin Cell Dev Biol, 2010. 21(9): p. 899-908.
  5.         Zhu, C. and W. Jiang, Cell cycle-dependent translocation of PRC1 on the spindle by Kif4 is essential for midzone formation and cytokinesis. Proc Natl Acad Sci U S A, 2005. 102(2): p. 343-8.
  6.         Cooke, C.A., et al., Localization of CENP-E in the fibrous corona and outer plate of mammalian kinetochores from prometaphase through anaphase. Chromosoma, 1997. 106(7): p. 446-55.
  7.         Yen, T.J., et al., CENP-E, a novel human centromere-associated protein required for progression from metaphase to anaphase. EMBO J, 1991. 10(5): p. 1245-54.
  8.         Kurasawa, Y., et al., Essential roles of KIF4 and its binding partner PRC1 in organized central spindle midzone formation. EMBO J, 2004. 23(16): p. 3237-48.
  9.         Yao, X., K.L. Anderson, and D.W. Cleveland, The microtubule-dependent motor centromere-associated protein E (CENP-E) is an integral component of kinetochore corona fibers that link centromeres to spindle microtubules. J Cell Biol, 1997. 139(2): p. 435-47.
  10.       Pamula, M.C., et al., High-resolution imaging reveals how the spindle midzone impacts chromosome movement. J Cell Biol, 2019. 218(8): p. 2529-2544.

 

 

Tags: cell division, kinesin, mitosis

Posted on: 6 May 2023 , updated on: 9 May 2023

doi: https://doi.org/10.1242/prelights.34561

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Author's response

The author team shared

Is it known if CENP-E phosphorylation is required for its association with kinetochores during metaphase, or is phosphorylation used just to inhibit PRC1 interaction?

CENP-E is a large molecule. The kinetochore domain (2055-2608 in humans) itself is not phosphorylated and so no phosphorylation on this domain is required for association with the kinetochore. However, Mps1 kinase detects unattached kinetochores and is highly active at kinetochores under these circumstances. Mps1 activity is required to assemble the outer corona, a fibrous structure at the outer kinetochore which CENP-E localizes to, to help microtubule capture. Thus, phosphorylation is important for CENP-E association with kinetochores, but no phosphorylation of CENP-E C-terminus has been shown to play a role in this so far.
Phosphorylation of the C terminus only inhibits its interaction with PRC1.

Do CENP-E and KIF4A compete for PRC1 binding – does the PRC11-168 mutation also inhibit binding to KifA4? Do CENP-E and KIF4A perform redundant functions during anaphase in sliding antiparallel microtubules?

All very interesting questions that we also would like to address! Both proteins use the same motif to bind the N terminus of PRC1 so competition for PRC1 binding is possible.

Are Kif4A and CENP-E under regulation by the same protein kinase? Or are they phosphorylated/dephosphorylated at different times during mitosis to prevent competition?

We have not particularly compared the regulation by phosphorylation of Kif4A and CENP-E. Both proteins are phosphorylated by Aurora A and CDK1 and likely dephosphorylated at the metaphase to anaphase transition. Aurora A phosphorylates Kif4A to help chromosome congression (Poser et al, 2019, 10.1083/jcb.201905194) while CDK promotes Kif4A association with chromosomes in early mitosis (10.1093/jmcb/mjy033). Both localize to the central spindle and midbody but we do not know if they compete there or not.

What’s the role of Aurora kinases and BubR1 kinases as they switch regulating CENP-E spatiotemporally?

BubR1 a spindle assembly checkpoint protein and is a pseudokinase-it does not display any kinase activity. It binds to Knl1 at unattached kinetochores in an Mps1 kinase dependent fashion. This recruits CENP-E which tries to capture microtubules but also other proteins important for kinetochore signalling and attachments.

Aurora B kinase seems to mildly reduce CENP-E levels at the outer kinetochore and corona but the localization of CENP-E quite heterogenous at kinetochores. So we currently don’t understand the role of Aurora B activity on CENP-E targeting to kinetochores. Aurora B is also present at the central spindle and midbody, where it is transported by MKLP2. It is possible it phosphorylates CENP-E there to tune its affinity for PRC1.

The spatio-temporal switch is also driven by other mitotic kinases. At metaphase, Mps1 kinase activity decreases, which reduces CENP-E association with the kinetochore. At the metaphase to anaphase transition, CDK activity drops and CENP-E is dephosphorylated. This drives the increase in affinity of CENP-E for PRC1.

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