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- Title
CIGB-300 anticancer peptide regulates the protein kinase CK2-dependent phosphoproteome.
- Authors
Perera, Yasser; Ramos, Yassel; Padrón, Gabriel; Caballero, Evelin; Guirola, Osmany; Caligiuri, Lorena G.; Lorenzo, Norailys; Gottardo, Florencia; Farina, Hernán G.; Filhol, Odile; Cochet, Claude; Perea, Silvio E.
- Abstract
Casein-kinase CK2 is a Ser/Thr protein kinase that fosters cell survival and proliferation of malignant cells. The CK2 holoenzyme, formed by the association of two catalytic alpha/alpha' (CK2α/CK2α') and two regulatory beta subunits (CK2β), phosphorylates diverse intracellular proteins partaking in key cellular processes. A handful of such CK2 substrates have been identified as targets for the substrate-binding anticancer peptide CIGB-300. However, since CK2β also contains a CK2 phosphorylation consensus motif, this peptide may also directly impinge on CK2 enzymatic activity, thus globally modifying the CK2-dependent phosphoproteome. To address such a possibility, firstly, we evaluated the potential interaction of CIGB-300 with CK2 subunits, both in cell-free assays and cellular lysates, as well as its effect on CK2 enzymatic activity. Then, we performed a phosphoproteomic survey focusing on early inhibitory events triggered by CIGB-300 and identified those CK2 substrates significantly inhibited along with disturbed cellular processes. Altogether, we provided here the first evidence for a direct impairment of CK2 enzymatic activity by CIGB-300. Of note, both CK2-mediated inhibitory mechanisms of this anticancer peptide (i.e., substrate- and enzyme-binding mechanism) may run in parallel in tumor cells and help to explain the different anti-neoplastic effects exerted by CIGB-300 in preclinical cancer models.
- Subjects
PROTEIN kinases; ANIMAL models in research; CELL proliferation; ANGIOTENSIN I
- Publication
Molecular & Cellular Biochemistry, 2020, Vol 470, Issue 1/2, p63
- ISSN
0300-8177
- Publication type
Article
- DOI
10.1007/s11010-020-03747-1