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Wyświetlanie 1-4 z 4
Tytuł:
Theoretical studies of binding modes of two covalent inhibitors of cysteine proteases.
Autorzy:
Drabik, Piotr
Politowska, Ewa
Czaplewski, Cezary
Kasprzykowski, Franciszek
Łankiewicz, Leszek
Ciarkowski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/1044228.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
cysteine proteases
covalent protease inhibitors
constrained simulated annealing
papain
molecular dynamics
Opis:
Physiological and pathological roles of cysteine proteases make them important targets for inhibitor development. Although highly potent inhibitors of this group of enzymes are known, their major drawback is a lack of sufficient specificity. Two cysteine protease covalent inhibitors, viz. (i) Z-RL-deoxo-V-peptide-epoxysuccinyl hybrid, and (ii) Z-RLVG-methyl-, have been developed and modeled in the catalytic pocket of papain, an archetypal thiol protease. A number of configurations have been generated and relaxed for each system using the AMBER force field. The catalytic pockets S3 and S4 appear rather elusive in view of the observed inhibitors' flexibility. This suggest rather limited chances for the development of selective structure-based inhibitors of thiol proteases, designed to exploit differences in the structure of catalytic pockets of various members of this family.
Źródło:
Acta Biochimica Polonica; 2000, 47, 4; 1061-1066
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical models of catalytic domains of protein phosphatases 1 and 2A with Zn2+ and Mn2+ metal dications and putative bioligands in their catalytic centers.
Autorzy:
Woźniak-Celmer, Edyta
Ołdziej, Stanisław
Ciarkowski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/1044161.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
protein phosphatase inhibitors
constrained simulated annealing
protein phosphatase 1A and 2B
molecular dynamics
homology modeling
Opis:
The oligomeric metalloenzymes protein phosphatases dephosphorylate OH groups of Ser/Thr or Tyr residues of proteins whose actions depend on the phosphorus signal. The catalytic units of Ser/Thr protein phosphatases 1, 2A and 2B (PP1c, PP2Ac and PP2Bc, respectively), which exhibit about 45% sequence similarity, have their active centers practically identical. This feature strongly suggests that the unknown structure of PP2Ac could be successfully homology-modeled from the known structures of PP1c and/or PP2Bc. Initially, a theoretical model of PP1c was built, including a phosphate and a metal dication in its catalytic site. The latter was modeled, together with a structural hydroxyl anion, as a triangular pseudo-molecule (Zno or Mno), composed of two metal cations (double Zn2+ or Mn2+, respectively) and the OH- group. To the free PP1c two inhibitor sequences R29RRRPpTPAMLFR40 of DARPP-32 and R30RRRPpTPATLVLT42 of Inhibitor-1, and two putative substrate sequences LRRApSVA and QRRQRKpRRTI were subsequently docked. In the next step, a free PP2Ac model was built via homology re-modeling of the PP1c template and the same four sequences were docked to it. Thus, together, 20 starting model complexes were built, allowing for combination of the Zno and Mno pseudo-molecules, free enzymes and the peptide ligands docked in the catalytic sites of PP1c and PP2Ac. All models were subsequently subjected to 250-300 ps molecular dynamics using the AMBER 5.0 program. The equilibrated trajectories of the final 50 ps were taken for further analyses. The theoretical models of PP1c complexes, irrespective of the dication type, exhibited increased mobilities in the following residue ranges: 195-200, 273-278, 287-209 for the inhibitor sequences and 21-25, 194-200, 222-227, 261, 299-302 for the substrate sequences. Paradoxically, the analogous PP2Ac models appeared much more stable in similar simulations, since only their "prosegment" residues 6-10 and 14-18 exhibited an increased mobility in the inhibitor complexes while no areas of increased mobility were found in the substrate complexes. Another general observation was that the complexes with Mn dications were more stable than those with Zn dications for both PP1c and PP2Ac units.
Źródło:
Acta Biochimica Polonica; 2001, 48, 1; 35-52
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Symulowane wyżarzanie dla problemu harmonogramowania projektu z ograniczonymi zasobami
Simulated annealing for project scheduling with limited resources
Autorzy:
Klimek, M.
Powiązania:
https://bibliotekanauki.pl/articles/91479.pdf
Data publikacji:
2016
Wydawca:
Warszawska Wyższa Szkoła Informatyki
Tematy:
wyżarzanie symulowane
harmonogramowanie projektu
ograniczone zasoby
procedury generowania rozwiązań
simulated annealing
resource-constrained project scheduling
schedule generation schemes
Opis:
W artykule przedstawiony jest problem harmonogramowania projektu z ograniczonymi zasobami z kryterium minimalizacji czasu trwania przedsięwzięcia. Do rozwiązania zagadnienia stosowany jest algorytm symulowanego wyżarzania, którego skuteczność testowana jest przy wykorzystaniu standardowych zadań testowych. Eksperymenty przeprowadzane są przy różnych konfiguracjach algorytmu w celu ustalenia najlepszych parametrów: schematu chłodzenia, technik przeszukiwania (ruchów), schematów generowania rozwiązań.
In this paper resource-constrained project scheduling problem with optimisation criterion of minimising makespan is presented. To solve the problem is applied simulated annealing algorithm, whose effectiveness is tested using standard test instances. Experiments are performed with different configurations algorithm to determine the best parameters: cooling schemes, search techniques (moves), schedule generation schemes.
Źródło:
Zeszyty Naukowe Warszawskiej Wyższej Szkoły Informatyki; 2016, 10, 15; 53-65
1896-396X
2082-8349
Pojawia się w:
Zeszyty Naukowe Warszawskiej Wyższej Szkoły Informatyki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Financial optimisation of the scheduling for the multi-stage project
Autorzy:
Klimek, M.
Łebkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/201022.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
resource - constrained project scheduling problem
discounted cash flows
milestones
backward scheduling
simulated annealing
zdyskontowane przepływy pieniężne
kamienie milowe
symulowane wyżarzanie
Opis:
The paper analyses the problem of discounted cash flow maximising for the resource-constrained project scheduling from the project contractor’s perspective. Financial optimisation for the multi-stage project is considered. Cash outflows are the contactor’s expenses related to activity execution. Cash inflows are the client’s payments for the completed milestones. To solve the problem, the procedure of backward scheduling taking into account contractual milestones is proposed. The effectiveness of this procedure, as used to generate solutions for the simulated annealing algorithm, is verified with use of standard test instances with additionally defined cash flows and contractual milestones.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 6; 899-908
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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