The dissolution of the nuclear membrane marks the beginning of the prometaphase. Kinetochores are created when proteins attach to the centromeres. Microtubules then attach at the kinetochores, and the chromosomes begin to move to the metaphase plate.
View original pathway at Reactome.
Okada M, Cheeseman IM, Hori T, Okawa K, McLeod IX, Yates JR, Desai A, Fukagawa T.; ''The CENP-H-I complex is required for the efficient incorporation of newly synthesized CENP-A into centromeres.''; PubMedEurope PMCScholia
Chen D, Ito S, Yuan H, Hyodo T, Kadomatsu K, Hamaguchi M, Senga T.; ''EML4 promotes the loading of NUDC to the spindle for mitotic progression.''; PubMedEurope PMCScholia
Takemoto A, Kimura K, Yanagisawa J, Yokoyama S, Hanaoka F.; ''Negative regulation of condensin I by CK2-mediated phosphorylation.''; PubMedEurope PMCScholia
Kotak S, Busso C, Gönczy P.; ''NuMA phosphorylation by CDK1 couples mitotic progression with cortical dynein function.''; PubMedEurope PMCScholia
Hsu HL, Yeh NH.; ''Dynamic changes of NuMA during the cell cycle and possible appearance of a truncated form of NuMA during apoptosis.''; PubMedEurope PMCScholia
Compton DA, Luo C.; ''Mutation of the predicted p34cdc2 phosphorylation sites in NuMA impair the assembly of the mitotic spindle and block mitosis.''; PubMedEurope PMCScholia
Houtman SH, Rutteman M, De Zeeuw CI, French PJ.; ''Echinoderm microtubule-associated protein like protein 4, a member of the echinoderm microtubule-associated protein family, stabilizes microtubules.''; PubMedEurope PMCScholia
Roig J, Mikhailov A, Belham C, Avruch J.; ''Nercc1, a mammalian NIMA-family kinase, binds the Ran GTPase and regulates mitotic progression.''; PubMedEurope PMCScholia
St-Pierre J, Douziech M, Bazile F, Pascariu M, Bonneil E, Sauvé V, Ratsima H, D'Amours D.; ''Polo kinase regulates mitotic chromosome condensation by hyperactivation of condensin DNA supercoiling activity.''; PubMedEurope PMCScholia
Hauf S, Waizenegger IC, Peters JM.; ''Cohesin cleavage by separase required for anaphase and cytokinesis in human cells.''; PubMedEurope PMCScholia
Kimura K, Cuvier O, Hirano T.; ''Chromosome condensation by a human condensin complex in Xenopus egg extracts.''; PubMedEurope PMCScholia
Salic A, Waters JC, Mitchison TJ.; ''Vertebrate shugoshin links sister centromere cohesion and kinetochore microtubule stability in mitosis.''; PubMedEurope PMCScholia
Shintomi K, Hirano T.; ''Releasing cohesin from chromosome arms in early mitosis: opposing actions of Wapl-Pds5 and Sgo1.''; PubMedEurope PMCScholia
Richards MW, O'Regan L, Roth D, Montgomery JM, Straube A, Fry AM, Bayliss R.; ''Microtubule association of EML proteins and the EML4-ALK variant 3 oncoprotein require an N-terminal trimerization domain.''; PubMedEurope PMCScholia
Zhou T, Aumais JP, Liu X, Yu-Lee LY, Erikson RL.; ''A role for Plk1 phosphorylation of NudC in cytokinesis.''; PubMedEurope PMCScholia
Belham C, Roig J, Caldwell JA, Aoyama Y, Kemp BE, Comb M, Avruch J.; ''A mitotic cascade of NIMA family kinases. Nercc1/Nek9 activates the Nek6 and Nek7 kinases.''; PubMedEurope PMCScholia
Losada A, Hirano M, Hirano T.; ''Identification of Xenopus SMC protein complexes required for sister chromatid cohesion.''; PubMedEurope PMCScholia
Nishiyama T, Ladurner R, Schmitz J, Kreidl E, Kreidl E, Schleiffer A, Bhaskara V, Bando M, Shirahige K, Hyman AA, Mechtler K, Peters JM.; ''Sororin mediates sister chromatid cohesion by antagonizing Wapl.''; PubMedEurope PMCScholia
Zhang N, Panigrahi AK, Mao Q, Pati D.; ''Interaction of Sororin protein with polo-like kinase 1 mediates resolution of chromosomal arm cohesion.''; PubMedEurope PMCScholia
Cheeseman IM, Desai A.; ''Molecular architecture of the kinetochore-microtubule interface.''; PubMedEurope PMCScholia
Watrin E, Schleiffer A, Tanaka K, Eisenhaber F, Nasmyth K, Peters JM.; ''Human Scc4 is required for cohesin binding to chromatin, sister-chromatid cohesion, and mitotic progression.''; PubMedEurope PMCScholia
Lipp JJ, Hirota T, Poser I, Peters JM.; ''Aurora B controls the association of condensin I but not condensin II with mitotic chromosomes.''; PubMedEurope PMCScholia
Kitajima TS, Sakuno T, Ishiguro K, Iemura S, Natsume T, Kawashima SA, Watanabe Y.; ''Shugoshin collaborates with protein phosphatase 2A to protect cohesin.''; PubMedEurope PMCScholia
Abe S, Nagasaka K, Hirayama Y, Kozuka-Hata H, Oyama M, Aoyagi Y, Obuse C, Hirota T.; ''The initial phase of chromosome condensation requires Cdk1-mediated phosphorylation of the CAP-D3 subunit of condensin II.''; PubMedEurope PMCScholia
Ono T, Fang Y, Spector DL, Hirano T.; ''Spatial and temporal regulation of Condensins I and II in mitotic chromosome assembly in human cells.''; PubMedEurope PMCScholia
Kueng S, Hegemann B, Peters BH, Lipp JJ, Schleiffer A, Mechtler K, Peters JM.; ''Wapl controls the dynamic association of cohesin with chromatin.''; PubMedEurope PMCScholia
Kimura K, Hirano M, Kobayashi R, Hirano T.; ''Phosphorylation and activation of 13S condensin by Cdc2 in vitro.''; PubMedEurope PMCScholia
Liu ST, Rattner JB, Jablonski SA, Yen TJ.; ''Mapping the assembly pathways that specify formation of the trilaminar kinetochore plates in human cells.''; PubMedEurope PMCScholia
Kitajima TS, Hauf S, Ohsugi M, Yamamoto T, Watanabe Y.; ''Human Bub1 defines the persistent cohesion site along the mitotic chromosome by affecting Shugoshin localization.''; PubMedEurope PMCScholia
Takemoto A, Kimura K, Yokoyama S, Hanaoka F.; ''Cell cycle-dependent phosphorylation, nuclear localization, and activation of human condensin.''; PubMedEurope PMCScholia
Deardorff MA, Bando M, Nakato R, Watrin E, Itoh T, Minamino M, Saitoh K, Komata M, Katou Y, Clark D, Cole KE, De Baere E, Decroos C, Di Donato N, Ernst S, Francey LJ, Gyftodimou Y, Hirashima K, Hullings M, Ishikawa Y, Jaulin C, Kaur M, Kiyono T, Lombardi PM, Magnaghi-Jaulin L, Mortier GR, Nozaki N, Petersen MB, Seimiya H, Siu VM, Suzuki Y, Takagaki K, Wilde JJ, Willems PJ, Prigent C, Gillessen-Kaesbach G, Christianson DW, Kaiser FJ, Jackson LG, Hirota T, Krantz ID, Shirahige K.; ''HDAC8 mutations in Cornelia de Lange syndrome affect the cohesin acetylation cycle.''; PubMedEurope PMCScholia
Kawashima SA, Yamagishi Y, Honda T, Ishiguro K, Watanabe Y.; ''Phosphorylation of H2A by Bub1 prevents chromosomal instability through localizing shugoshin.''; PubMedEurope PMCScholia
Haren L, Merdes A.; ''Direct binding of NuMA to tubulin is mediated by a novel sequence motif in the tail domain that bundles and stabilizes microtubules.''; PubMedEurope PMCScholia
Gandhi R, Gillespie PJ, Hirano T.; ''Human Wapl is a cohesin-binding protein that promotes sister-chromatid resolution in mitotic prophase.''; PubMedEurope PMCScholia
Foltz DR, Jansen LE, Black BE, Bailey AO, Yates JR, Cleveland DW.; ''The human CENP-A centromeric nucleosome-associated complex.''; PubMedEurope PMCScholia
Cheeseman IM, Chappie JS, Wilson-Kubalek EM, Desai A.; ''The conserved KMN network constitutes the core microtubule-binding site of the kinetochore.''; PubMedEurope PMCScholia
Murphy LA, Sarge KD.; ''Phosphorylation of CAP-G is required for its chromosomal DNA localization during mitosis.''; PubMedEurope PMCScholia
Kitajima TS, Kawashima SA, Watanabe Y.; ''The conserved kinetochore protein shugoshin protects centromeric cohesion during meiosis.''; PubMedEurope PMCScholia
Adib R, Montgomery JM, Atherton J, O'Regan L, Richards MW, Straatman KR, Roth D, Straube A, Bayliss R, Moores CA, Fry AM.; ''Mitotic phosphorylation by NEK6 and NEK7 reduces the microtubule affinity of EML4 to promote chromosome congression.''; PubMedEurope PMCScholia
Pollmann M, Parwaresch R, Adam-Klages S, Kruse ML, Buck F, Heidebrecht HJ.; ''Human EML4, a novel member of the EMAP family, is essential for microtubule formation.''; PubMedEurope PMCScholia
Yamagishi Y, Sakuno T, Shimura M, Watanabe Y.; ''Heterochromatin links to centromeric protection by recruiting shugoshin.''; PubMedEurope PMCScholia
Hauf S, Roitinger E, Koch B, Dittrich CM, Mechtler K, Peters JM.; ''Dissociation of cohesin from chromosome arms and loss of arm cohesion during early mitosis depends on phosphorylation of SA2.''; PubMedEurope PMCScholia
Hirota T, Gerlich D, Koch B, Ellenberg J, Peters JM.; ''Distinct functions of condensin I and II in mitotic chromosome assembly.''; PubMedEurope PMCScholia
Aumais JP, Williams SN, Luo W, Nishino M, Caldwell KA, Caldwell GA, Lin SH, Yu-Lee LY.; ''Role for NudC, a dynein-associated nuclear movement protein, in mitosis and cytokinesis.''; PubMedEurope PMCScholia
Dreier MR, Bekier ME, Taylor WR.; ''Regulation of sororin by Cdk1-mediated phosphorylation.''; PubMedEurope PMCScholia
Metaphase is marked by the formation of the metaphase plate. The metaphase plate is formed when the spindle fibers align the chromosomes along the middle of the cell. Such an organization helps to ensure that later, when the chromosomes are separated, each new nucleus that is formed receives one copy of each chromosome. This pathway has not yet been annotated in Reactome.
The metaphase to anaphase transition during mitosis is triggered by the destruction of mitotic cyclins.
In anaphase, the paired chromosomes separate at the centromeres, and move to the opposite sides of the cell. The movement of the chromosomes is facilitated by a combination of kinetochore movement along the spindle microtubules and through the physical interaction of polar microtubules.
During prophase, the chromatin in the nucleus condenses, and the nucleolus disappears. Centrioles begin moving to the opposite poles or sides of the cell. Some of the fibers that extend from the centromeres cross the cell to form the mitotic spindle.
DNA synthesis occurs in the S phase, or the synthesis phase, of the cell cycle. The cell duplicates its hereditary material, and two copies of the chromosome are formed. As DNA replication continues, the E type cyclins shared by the G1 and S phases, are destroyed and the levels of the mitotic cyclins rise.
The polo-like kinase PLK1 phosphorylates NUDC on serine residues S274 and S326. PLK1-mediated phosphorylation of NUDC is required for both mitotic spindle formation and cytokinesis (Zhou et al. 2003). Interaction of NUDC with dynactin and dynein complexes is also important for its role in mitosis (Aumais et al. 2003). In interphase cells, NUDC is acetylated on lysine residue K39 by an unknown protein acetyl transferase. Deacetylation of NUDC, possibly by HDAC3, at the beginning of mitosis is required for mitotic progression. The interaction of NUDC with PLK1 does not depend on the acetylation status of NUDC (Chuang et al. 2013).
Prior to anaphase onset, sister-chromatids are held together by cohesin complexes distributed along chromosomal arms and at centromeres. In prometaphase, PLK1, likely recruited to cohesin complexes by binding to CDK1-phosphorylated CDCA5 (Sororin) (Zhang et al. 2011), phosphorylates cohesin subunits STAG2 (SA2) and RAD21 (Hauf et al. 2005). PLK1-mediated phosphorylation of cohesin subunits at centromeres is counteracted by the phosphatase activity of PP2A complex (containing the regulatory subunit B56 i.e. PPP2R5), which is recruited to the kinetochore by shugoshin proteins, SGOL1 and SGOL2 (Kitajima et al. 2006). Therefore, while cohesin complexes dissociate from chromosomal arms in prometaphase (Hauf et al. 2001), they remain bound to centromeres until anaphase onset (Hauf et al. 2001, Hauf et al. 2005, Kitajima et al. 2006). When separase is activated after its inhibitor securin is degraded by APC/C at the onset of anaphase, RAD21 is cleaved by separase. Phosphorylation of RAD21 by PLK1 facilitates subsequent cleavage of RAD21 by separase (Hauf et al. 2005). There are several potential PLK1 phosphorylation sites in STAG2 and RAD21, but the exact positions of in vivo phosphorylation of STAG2 and RAD21 by PLK1 have not been explicitly established (Hauf et al. 2005).
PLK1-mediated phosphorylation of the STAG2 subunit of centromeric cohesin (Hauf et al. 2005) is counteracted by the kinetochore PP2A phosphatase, containing the 56 kDa regulatory B subunit (PP2A-B56 i.e. PP2A-PPP2R5). PP2A-B56 is recruited to the centromeric cohesin complex by shugoshin proteins (SGOL1 and SGOL2) (Kitajima et al. 2006), which are also kinetochore constituents (Cheeseman and Desai 2008). SGOL1 localization to centromeres is sustained by the interaction with histone H2A possessing the phosphorylation of T120 which is introduced by the protein kinase BUB1, and heterochromatin protein HP1 (Kitajima et al. 2005, Kawashima et al. 2010, Yamagishi et al. 2008). Shugoshin- and PP2A-B56-regulated dephosphorylation of centromeric STAG2 ensures that the cohesin complex remains bound to centromeres throughout prometaphase and metaphase, thereby preventing premature separation of sister chromatids (Salic et al. 2004, Kitajima et al. 2004, Kitajima et al. 2005, Kitajima et al. 2006).
Prior to anaphase onset, sister-chromatids are held together by cohesin complexes. PLK1-dependent phosphorylation of the cohesin subunit STAG2 (SA2) (Hauf et al. 2005) promotes dissociation of cohesins from chromosomal arms in prometaphase (Hauf et al. 2001). Besides phosphorylating STAG2, PLK1 also phosphorylates RAD21 cohesin subunit, but the phosphorylation of RAD21 is not required for the dissociation of cohesin from chromosomal arms in early mitosis (Hauf et al. 2005). There are several potential PLK1 phosphorylation sites in STAG2 and RAD21, but the exact positions of in vivo phosphorylation of STAG2 and RAD21 by PLK1 have not been explicitly established (Hauf et al. 2005). It is likely that the phosphorylation of cohesin-bound CDCA5 (Sororin) by CDK1 creates a docking site for PLK1 at threonine T159 of CDCA5, thus enabling PLK1 to phosphorylate cohesin subunits (Zhang et al. 2011).
Cohesin complexes dissociate from chromosomal arms in prometaphase, leading to sister chromatid resolution. Sister chromatid resolution involves separation of sister chromosomal arms while cohesion at sister centromeres persists (Losada et al. 1998, Hauf et al. 2001, Hauf et al. 2005). Cohesin and CDCA5 (Sororin) simultaneously dissociate from chromosomal arms in prometaphase (Nishiyama et al. 2010, Zhang et al. 2011). This process, triggered by CDK1-mediated phosphorylation of CDCA5 (Dreier et al. 2011, Zhang et al. 2011) and PLK1-mediated phosphorylation of the STAG2 cohesin subunit (Hauf et al. 2005), is controlled by WAPAL (Gandhi et al. 2006, Kueng et al. 2006, Shintomi and Hirano 2009). WAPAL controls cohesion of sister chromatids likely through competing with CDCA5 for binding to cohesin-associated PDS5 (PDS5A and PDS5B) (Nishiyama et al. 2010). While the interaction of WAPAL with PDS5 depends on CDCA5 (Nishiyama et al. 2010), WAPAL maintains its association with cohesin through interaction with cohesin subunits (Kueng et al. 2006, Shintomi and Hirano 2009).
Phosphorylation of CDCA5 (Sororin) coincides with dissociation of CDCA5 from chromosomal arms in prometaphase, but phosphorylated CDCA5 persists on centromeres throughout prophase and metaphase. Several serine and threonine residues in CDCA5 are phosphorylated by CDK1 in prometaphase, but only the three sites that perfectly match the CDK1 consensus phosphorylation sequence are shown here - serines S21 and S75 and threonine T159 (Drier et al. 2011, Zhang et al. 2011).
Phosphorylation of CDCA5 (Sororin) coincides with dissociation of CDCA5 from chromosomal arms in prometaphase. Several serine and threonine residues in CDCA5 are phosphorylated by CDK1 in prometaphase, but only the three sites that perfectly match the CDK1 consensus phosphorylation sequence are shown here - serines S21 and S75 and threonine T159 (Drier et al. 2011, Zhang et al. 2011).
The kinetochore assembly on centromeres of replicated chromosomes is completed by mitotic prometaphase. Some kinetochore components are associated with centromeres throughout the cell cycle while others associate with centromeres during mitosis. The sequential kinetochore assembly and kinetochore dynamics is not shown here. For a review of this process, please refer to Cheeseman and Desai 2008.
CDK1 (CDC2) in complex with CCNB (cyclin B) phosphorylates condensin I subunits NCAPD2, NCAPG and NCAPH in mitosis (Kimura et al. 2001, Takemoto et al. 2006), but other mitotic kinases may also be involved. CDK1 phosphorylation sites in NCAPH have not been established. NCAPD2 threonine residues T1339, T1384 and T1389 are inferred to be phosphorylated by CDK1 based on homologues sites in Xenopus laevis Ncapd2 (Kimura et al. 1998). NCAPG threonine residues T308 and T332 are phosphorylated by CDK1 in vitro and functionally important. The functional importance of threonine T931, also phosphorylated by CDK1 in vitro, has not been demonstrated (Murphy et al. 2008). Phosphorylation by CDK1 is required for mitotic activation of condensin I and promotes chromosomal binding, introduction of positive supercoils into DNA, and chromatin condensation (Kimura et al. 1998, Kimura et al. 2001, Takemoto et al. 2006).
While condensin II complex (consisting of subunits SMC2, SMC4, NCAPD3, NCAPG2 and NCAPH2), responsible for condensation of chromosomes in prophase (Hirota et al. 2004, Abe et al. 2011), is nuclear, condensin I is cytosolic and gains access to chromosomes only after the nuclear envelope breakdown at the start of prometaphase (Ono et al. 2004). Condensin I, activated by CDK1 phosphorylation (Kimura et al. 1998, Kimura et al. 2001, Takemoto et al. 2006, Murphy et al. 2008), promotes further condensation of chromosomes in prometaphase and metaphase, visible as longitudinal chromosome shortening (Hirota et al. 2004). Besides CDK1-mediated phosphorylation, association of condensin I with chromosomes may be regulated by AURKB (Lipp et al. 2007). In budding yeast, condensin phosphorylation by Cdc2 (CDK1 ortholog) is followed by Cdc5-mediated phosphorylation (Cdc5 is PLK1 ortholog), which is important for the sustained mitotic activity of condensin complex (St-Pierre et al. 2009). Phosphorylation by PLK1 is also important for the activation of human condensin II complex (Abe et al. 2011).
Inhibitory phosphate groups that were added to condensin I subunits by CK2 during interphase have to be removed for full mitotic activation of condensin I (Takemoto et al. 2006). The responsible phosphatase has not been identified.
Protein levels of condensin subunits are constant during the cell cycle. Four subunits, SMC4, NCAPD2, NCAPG and NCAPH, are phosphorylated in interphase cells (Takemoto et al. 2004) by CK2 i.e. casein kinase II (Takemoto et al. 2006). Except for the phosphorylation of NCAPH subunit on serine residue S570, CK2 phosphorylation sites in condensin I subunits have not been identified. Phosphorylation by CK2 inhibits condensin I-mediated introduction of positive supercoils into DNA and chromatin condensation. Mitotic activation of condensin I involves removal of phosphate groups added by CK2 (Takemoto et al. 2006), but the responsible phosphatase has not been identified.
The human kinetochore, is a complex proteinaceous structure that assembles on centromeric DNA and mediates the association of mitotic chromosomes with spindle microtubules in prometaphase. The molecular composition of the human kinetochore is reviewed in detail in Cheeseman et al., 2008. This complex structure is composed of numerous protein complexes and networks including: the constitutive centromere-associated network (CCAN) containing several sub-networks such as (CENP-H, I, K), (CENP-50/U, O, P, Q, R), the KMN network (containing KNL1, the Mis12 complex, and the Ndc80 complex), the chromosomal passenger complex, the mitotic checkpoint complex, the nucleoporin 107-160 complex and the RZZ complex. At prometaphase, following breakdown of the nuclear envelope, the kinetochores of condensed chromosomes begin to interact with spindle microtubules. In humans, 15-20 microtubules are bound to each kinetochore (McEwen et al., 2001), and the attachment of 15 microtubules to the kinetochore is shown in this reaction. Recently, it was found that the core kinetochore-microtubule attachment site is within the KMN network and is likely to be formed by two closely apposed low-affinity microtubule-binding sites, one in the Ndc80 complex and a second in KNL1 (Cheeseman et al., 2006).
NuMA can interact with microtubules by direct binding to tubulin. Binding occurs through amino acids 1868-1967 of human NuMA (tail IIA) and appears to play a role in the organization of the spindle poles by stably crosslinking microtubule fibers (Haren and Merdes 2002). While the exact mechanism of microtubule bundling is not known, NuMA has been shown to form large fibrous networks (Saredi et al. 1996, Gueth-Hallonet et al.1998, Harborth et al.1999) apparently as a result of dimerization of the NuMA rod domains followed by association of multiple NuMA dimers through their tail domains.
After the nuclear envelope breakdown, phosphorylated NuMA rapidly moves to the centrosomal region (Compton and Luo 1995, Hsu and Yeh 1996, Kotak et al. 2013).
EML4, a microtubule binding protein involved in mitotic spindle formation, forms homotrimers. Trimerization involves the trimerization domain (TD) and the basic region of EML4 and is necessary for its association with the microtubules (Richards et al. 2015). Heterotrimerization of EML4 with other EML family members has not been examined.
In interphase cells, EML4 associates with cytosolic microtubules. The interaction involves the N-terminal domain of EML4 (Pollmann et al. 2006). EML4 trimerization is needed for microtubule binding (Richards et al. 2015). EML4 binding stabilizes interphase microtubules (Houtman et al. 2007, Adib et al. 2019).
At mitotic entry, EML4 undergoes phosphorylation on serine and/or threonine residues (Pollmann et al. 2006). NEK6 and NEK7 serine/threonine kinases phosphorylate EML4 at evolutionarily conserved serine residues S144 and S146. Phosphorylation of EML4 at S144 and S146 reduces the affinity of EML4 for microtubules, leading to an increase in microtubule instability that is necessary for the assembly of a dynamic mitotic spindle and successful segregation of duplicated chromosomes (Adib et al. 2019).
EML4 binds to NUDC and recruits it to the kinetochores of the mitotic spindle. The interaction involves the WD40 repeats of EML4 and the C-terminus of NUDC (Chen et al. 2015). Knockdown of EML4 produces similar mitotic defects as the knockdown of NUDC. The knockdown of either of these two genes frequently results in post-mitotic cell death, due to activation of the mitotic spindle checkpoint (Chen et al. 2015, Adib et al. 2019). It is uncertain if PLK1-mediated phosphorylation of NUDC precedes its binding to EML4.
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DataNodes
prometaphase
chromosomescentrosome enriched in
gamma-TURC:p-T2055-NUMA1 homodimerenriched in gamma-TURC
complexesThe metaphase to anaphase transition during mitosis is triggered by the destruction of mitotic cyclins.
In anaphase, the paired chromosomes separate at the centromeres, and move to the opposite sides of the cell. The movement of the chromosomes is facilitated by a combination of kinetochore movement along the spindle microtubules and through the physical interaction of polar microtubules.
Chromosomal
Arms:Ac-Cohesin:PDS5:CDCA5:WAPALChromosomal
Arms:Ac-Cohesin:PDS5:p-CDCA5:WAPALChromosomal
Arms:p-STAG2,RAD21-Ac-Cohesin:PDS5:p-CDCA5:WAPALp-S206-NEK6/
p-S195-NEK7homodimer:Mature
centrosome:nucleated microtubulesAnnotated Interactions
prometaphase
chromosomescentrosome enriched in
gamma-TURC:p-T2055-NUMA1 homodimercentrosome enriched in
gamma-TURC:p-T2055-NUMA1 homodimerenriched in gamma-TURC
complexesAt prometaphase, following breakdown of the nuclear envelope, the kinetochores of condensed chromosomes begin to interact with spindle microtubules. In humans, 15-20 microtubules are bound to each kinetochore (McEwen et al., 2001), and the attachment of 15 microtubules to the kinetochore is shown in this reaction. Recently, it was found that the core kinetochore-microtubule attachment site is within the KMN network and is likely to be formed by two closely apposed low-affinity microtubule-binding sites, one in the Ndc80 complex and a second in KNL1 (Cheeseman et al., 2006).
Chromosomal
Arms:Ac-Cohesin:PDS5:CDCA5:WAPALChromosomal
Arms:Ac-Cohesin:PDS5:p-CDCA5:WAPALChromosomal
Arms:Ac-Cohesin:PDS5:p-CDCA5:WAPALChromosomal
Arms:p-STAG2,RAD21-Ac-Cohesin:PDS5:p-CDCA5:WAPALChromosomal
Arms:p-STAG2,RAD21-Ac-Cohesin:PDS5:p-CDCA5:WAPALp-S206-NEK6/
p-S195-NEK7p-S206-NEK6/
p-S195-NEK7homodimer:Mature
centrosome:nucleated microtubules