10 A niversary of IIMCB

Selected publications
• Wawrzynow B, Pettersson S, Zylicz A, Bramham J, Worral
E, Hupp TR, and Ball K. A function for the RING finger
domain in the allosteric control of MDM2 conformation
and function. J Biol Chem, 2009; in press
• Szymanska Z, Zylicz M. Mathematical Modeling of Heat
Shock Proteins Synthesis in Response to Temperature
Change. J Math Biol, 2009; in press
• Zurawska A, Urbanski J, Bieganowski P. Hsp90n -
An accidental product of a fortuitous chromosomal
translocation rather than a regular Hsp90 family member
of human proteome. Biochim Biophys Acta, 2008;
1784:1844-6
• Stevens C, Pettersson S, Wawrzynow B, Wallace M, Ball
K, Zylicz A, Hupp T.R. ATP stimulates MDM2-mediated
inhibition of the DNA-binding function of E2F1. FEBS J,
2008; 275:4875-86
• Szymanska Z, Urbanski J, Marciniak-Czochra A.
Mathematical modelling of the influence of heat shock
proteins on cancer invasion of tissue. J Math Biol, 2008;
DOI 10.1007/s00285-008-0220-0
• Wawrzynow B, Zylicz A, Wallace M, Hupp T, Zylicz M.
MDM2 Chaperones the p53 Tumor Suppressor. J Biol
Chem, 2007; 282:32603-12
• Issat T, Nowis D, Legat M, Makowski M, Klejman MP,
Urbanski J, Skierski J, Koronkiewicz M, Stoklosa T, Brzezinska
A, Bil J, Gietka J, Jakobisiak M, Golab J. Potentiated
antitumor effects of the combination treatment with
statins and pamidronate in vitro and in vivo. Int J Oncol,
2007; 6:1413-25
• Spiechowicz M, Zylicz A, Bieganowski P, Kuznicki J,
Filipek A. Hsp70 is a new target of Sgt1- an interaction
modulated by S100A6A. Biochem Biophys Res Commun,
2007; 357:1148-53
• Kudla G, Lipinski L, Caffin F, Helwak A, Zylicz M. High
guanine and cytosine content increases mRNA levels in
mammalian cells. PLoS Biology, 2006; 4:0933-42
• Walerych D, Kudla G, Gutkowska M, Wawrzynow
B, Muller L, King G, Helwak A, Boros J, Zylicz A,
Zylicz M. Hsp90 chaperones wild-type p53 tumor
suppressor protein. J Biol Chem, 2004; 279: 48836-45
• Dworakowska D, Jassem E, Jassem J, Peters B, Dziadziuszko
R, Zylicz M, Jakobkiewicz-Banecka J, Kobierska-Gulida
G, Szymanowska A, Skokowski J, Roessner A, Schneider-
Stock R. MDM2 gene amplification: new independent
factor of adverse prognosis in non-small cell lung cancer
(NSCLC) Lung Cancer, 2004; 43:285-295
• Kudla G, Helwak A, Lipinski L. Gene conversion and GCcontent
evolution in mammalian Hsp70. Mol Biol Evol,
2004; 21:1438-54
• Zylicz M, King FW, Wawrzynow A. Hsp70 interactions
with the p53 tumour suppressor protein. EMBO J, 2001;
20:4634-8
• King FW, Wawrzynow A, Hohfeld J, Zylicz M. Cochaperones
Bag-1, Hop and Hsp40 regulate Hsc70 and
Hsp90 interactions with wild-type or mutant p53. EMBO
J, 2001; 20:6297-305
Summary of work
The research conducted in our department is mainly
focused on activities of molecular chaperones in mammalian
cells, including cell transformation (review Zylicz et al.,
2001, also see recently published system biology papers:
Szymanska et al., 2008, Szymanska and Zylicz, 2009). Using
highly purified recombinant human proteins we had
previously identified intermediate reactions leading to the
assembly of molecular chaperone complexes with the wild
type or mutant p53 tumour suppressor protein (King et al.,
2001). More recently we have demonstrated that Hsp90
molecular chaperone is required for binding of wt p53 to
the promoter sequences under physiological temperature,
37 o C and that this chaperoning activity is ATP-dependent
(Walerych et al., 2004). Currently we provide in vivo evidence
that Hsp90 and Hsp70 chaperone machines are required for
proper folding of wt p53, its specific binding to chromatin
and transcription of p53-dependent genes.
p53 tumor suppressor protein is a thermodynamically
unstable, largely unstructured transcription factor. Applying
conformation-specific immunoprecipitation, we showed that
in H1299 p53 -/- cells, transfected with human wild-type p53,
both Hsp90 and Hsp70 molecular chaperones were required
for maintenance and stabilization of native conformation
of p53 under physiological and heat-shock conditions and
for refolding of WT p53 at 37°C, during the recovery from
heat-shock. Using FRAP analysis we demonstrated that at
physiological temperature inhibition of both Hsp70 and
Hsp90 systems by expression of the dominant negative
Hsp70K71S variant and 17-AAG, respectively, increased the
nuclear mobility of WT p53, most likely reflecting changes
of its specific interactions with chromatin. Using chromatin
immunoprecipitation (ChIP) we confirmed that interaction of
WT p53 with WAF1 promoter indeed was sensitive to Hsp70
and Hsp90 inhibition at the physiological temperature of
37°C and further decreased upon heat-shock. The influence
of Hsp90 and Hsp70 on p53 binding to the WAF1 promoter
sequence have also been confirmed in vitro, using highly
Fig. 1. Living MCF-7 cells were surface stained with anti-Hsp90 antibodies
on ice, followed by fixation, permeabilization and DAPI stain of cell nuclei
(author: Marcin Klejman).
Department of Molecular Biology 23