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AvtorJaremko, Łukasz
Jaremko, Mariusz
Elfaki, Imadeldin
Mueller, Jonathan W.
Ejchart, Andrzej
Bayer, Peter
Zhukov, Igor
Naslov Structure and dynamics of the first archaeal parvulin reveal a new functionally important loop in parvulin-type prolyl isomerases / Łukasz Jaremko ... [et al.]
Vrsta/vsebinatype of material članek - sestavni del
Fizični opisstr. 6554-6565
OpombeSoavtorji: Mariusz Jaremko, Imadeldin Elfaki, Jonathan W. Mueller, Andrzej Ejchart, Peter Bayer, Igor Zhukov
Bibliografija: str. 6564-6565
Predmetne oznake (nekontrolirane)strukturna kemija / biokemija / dinamika
PovzetekParvulins are a group of peptidyl-prolyl isomerases (PPIases) responsible for important biological processes in all kingdoms of life. The PinA protein from the psychrophilic archaeon Cenarchaeum symbiosum is a parvulin-like PPIase. Due to its striking similarity to the human parvulins Pin1 and Par14, PinA constitutes an interesting subject for structural and functional studies. Here, we present the first high resolution NMR structure of an archaeal parvulin, PinA, based on 1798 conformational restraints. Structure calculationyields an ensemble of 20 convergent low energy structures with a backbone r.m.s.d. value of 0.6 A within the secondary structure elements. The overall fold of PinA comprises the ß-?3-ß-?-ß2 fold typical for all parvulin structures known so far, but with helix III being a short 310-helix. A detailed comparison of this high resolution structure of the first archaeal PinA protein with bacterial and eukaryotic parvulin PPIase structures reveals an atypically large catalytic binding site. This feature provides an explanation for cold-adapted protein function. Moreover, the residues in and around 310-helix III exhibit strong intramolecular dynamics on a microsecond to millisecond timescale and display structural heterogeneity within the NMR ensemble. A putative peptide ligand was found for PinA by phage display and was used for 1H-15N-HSQC titrations. Again, the flexible region around 310-helix III as well as residues of the peptide binding pocket showed the strongest chemical shift perturbations upon peptide binding. The local flexibility of this region also was modulated by ligand binding. A glycine andtwo positively charged residues are conserved in most parvulin proteins in this flexible loop region, which may be of general functional importance for parvulin-type PPIases.
Glej publikacijo TI=The Journal of biological chemistry ISSN: 0021-9258.- Vol. 286, no. 8 (2011), str. 6554-6565