We describe the application of the two-hybrid system to the identification of protein-protein interaction temperature-sensitive mutants. We applied this strategy to the interaction between the human CDK2 cell cycle regulator and the p21Cip1 regulatory subunit. A library of randomly generated CDK2 mutant proteins was screened for interaction with p21Cip1 at different temperatures. This approach ...

Cyclin-dependent kinases (CDKs) are enzymes controlling the eukaryotic cell cycle. CDKs activity is regulated by complex mechanism that includes binding to positive regulatory subunit and phosphorylation at positive and/or negative regulatory sites [1]. CDK2 requires for activation binding to cyclinA or cyclinE. CDK2 obtains full activity by phosphorylation of the Thr160 residue in the activati...

The objective of this research was to study the potential function of protein kinase C (PKC)-ι in cell cycle progression and proliferation in glioblastoma. PKC-ι is highly overexpressed in human glioma and benign and malignant meningioma; however, little is understood about its role in regulating cell proliferation of glioblastoma. Several upstream molecular aberrations and/or loss of PTEN have...

The activation of phase-specific cyclin-dependent kinases (Cdks) is associated with ordered cell cycle transitions. Among the mammalian Cdks, only Cdk1 is essential for somatic cell proliferation. Cdk1 can apparently substitute for Cdk2, Cdk4, and Cdk6, which are individually dispensable in mice. It is unclear if all functions of non-essential Cdks are fully redundant with Cdk1. Using a genetic...

An important question in the cell cycle field is how cyclin-dependent kinases (cdks) target their substrates. We have studied the role of a conserved hydrophobic patch on the surface of cyclin A in substrate recognition by cyclin A-cdk2. This hydrophobic patch is approximately 35A away from the active site of cdk2 and contains the MRAIL sequence conserved among a number of mammalian cyclins. In...

Cyclin-dependent kinase 2 (CDK2) has been reported to be essential for cell proliferation in several human tumours and it has been suggested as an appropriate target to be considered in order to enhance the efficacy of treatment regimens based on the use of DNA damaging drugs. We evaluated the clinical impact of CDK2 overexpression on a series of 21 high-grade osteosarcoma (OS) samples profiled...

Doğada nadir olarak bulunan ve çoğu canlının yaşamı için elzem olan makro moleküllerin yapı taşları arasında yer alan piridazinler pek çok farklı biyolojik aktiviteye sahip bir heterosiklik bileşik ailesidir. Bu çalışmada Ünal grubu tarafından sentezlenen yeni 8 piridazin türevi bileşiğin DNA replikasyonu gibi önemli hücresel süreçlerde rol bu nedenle aktivitesinde gözlenen anormalliklerin kans...

Cytoplasmic mislocalization of p27 and cdk2 mediates the anti-migratory and anti1 proliferative effects of Nodal in human trophoblast cells 2 3 Lubna Nadeem, Jelena Brkic, Yangchun Frank Chen, Tung Bui, Sadia Munir and Chun Peng 4 Department of Biology, York University, Toronto, Canada 5 6 7 Running title: p27 and cdk2 mediate Nodal actions 8

BRCA1, a breast and ovarian tumor suppressor, is a phosphoprotein whose cellular expression level is regulated in a cell cycle-dependent manner. BRCA1 interacts with BARD1 to generate significant ubiquitin ligase activity which catalyzes nontraditional Lys-6-linked polyubiquitin chains. However, it is not clear how the activity is regulated and how this affects BRCA1's multiple cellular functio...

BACKGROUND Cyclin E, in conjunction with its catalytic partner cdk2, is rate limiting for entry into the S phase of the cell cycle. Cancer cells frequently contain mutations within the cyclin D-Retinoblastoma protein pathway that lead to inappropriate cyclin E-cdk2 activation. Although deregulated cyclin E-cdk2 activity is believed to directly contribute to the neoplastic progression of these c...