Protein kinase rad3; Serine/threonine kinase which activates checkpoint signaling upon genotoxic stresses. Involved in G2 arrest following DNA damage where it phosphorylates chk1. Phosphorylation of 'Thr-73' and 'Ser-80' of checkpoint mediator crb2 promotes its interaction with chk1. It is also involved in the dependence of mitosis on the completion of DNA replication ; Belongs to the PI3/PI4-kinase family. ATM subfamily.

DNA repair protein crb2; Essential for cell cycle arrest at the G1 and G2 stages following DNA damage by X-, and UV-irradiation, or inactivation of DNA ligase. Plays a role in the response to DNA damage. Interaction with rad4 via its phosphorylation sites in the N-terminus couples the DNA checkpoint apparatus to chromatin via interaction of its C-terminal BRCT domains with epigenetic modifications on histones H4 and H2A, respectively, in the G1/S phase of the cell cycle, and facilitates recruitment of the checkpoint kinase chk1.

Cell cycle serine/threonine-protein kinase hsk1; Required for G1/S transition. Plays a role in DNA replication checkpoint signaling through regulating rad3 and cds1. Involved in the maintenance of mitotic chromosome structures during S phase through regulating the function of rad21. Required for initiation of mitotic DNA replication through phosphorylating mcm2/cdc19. Required for genome integrity; Belongs to the protein kinase superfamily. Ser/Thr protein kinase family. CDC7 subfamily.

Histone chaperone cia1; Histone chaperone that facilitates histone deposition and histone exchange and removal during nucleosome assembly and disassembly.

Serine/threonine-protein kinase plo1; Required to form a bipolar spindle, the actin ring and septum. Functions upstream of the whole septum formation pathway, including actin ring formation (regulated by late septation genes) and septal material deposition (regulated by early septation genes). Behaves as a 'septum-promoting factor', and could also be involved in inducing other late events of cell division. Together with moa1, acts as a regulator of kinetochore function during meiosis I: required both for mono-orientation of kinetochores on sister chromosomes and protection of centromer [...]

M-phase inducer phosphatase; This protein functions as a dosage-dependent inducer in mitotic control. It is a tyrosine protein phosphatase required for progression of the cell cycle. It may directly dephosphorylate p34(cdc2) and activate the p34(cdc2) kinase activity.

Serine/threonine-protein kinase chk1; Serine/threonine-protein kinase which is required for checkpoint-mediated cell cycle arrest and activation of DNA repair in response to the presence of DNA damage or unreplicated DNA. May also negatively regulate cell cycle progression during unperturbed cell cycles. Binds to and phosphorylates CDC25. This leads to negative regulation of CDC25 and prevents mitotic entry.

Mitosis inhibitor protein kinase wee1; Protein kinase that acts both on serines and on tyrosines. It acts as a dosage-dependent negative regulator of entry into mitosis (G2 to M transition). Phosphorylates and inhibits cdc2. Belongs to the protein kinase superfamily. Ser/Thr protein kinase family. WEE1 subfamily.

Crossover junction endonuclease mus81; Interacts with eme1 to form a DNA structure-specific endonuclease with substrate preference for branched DNA structures with a 5'-end at the branch nick. Typical substrates include 3'-flap structures, D-loops, replication forks and nicked Holliday junctions. May be required in mitosis for the processing of stalled or collapsed replication fork intermediates. May be required in meiosis for the repair of meiosis-specific double strand breaks subsequent to single- end invasion (SEI). Belongs to the XPF family.