Stability of the dimeric and hexameric form of purine nucleoside phosphorylase from Escherichia coli – a computational study

Hajnić, Matea (2012) Stability of the dimeric and hexameric form of purine nucleoside phosphorylase from Escherichia coli – a computational study. Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

Purine nucleoside phosphorylase (PNP) is one of the key enzymes in purine salvage pathway which helps cells to recover nucleotides from degradation intermediates of nucleic acids. Biologically active form of PNP in Escherichia coli is a homohexamer, also seen as a trimer of dimers mutually connected with non-covalent bonds, and still with no cooperativity proven between them. In order to examine if a dimer is sufficient for catalysis, combinations of mutations were introduced in silico into hexameric structure of wild type PNP from E.coli. Mutations or combinations thereof were introduced to disrupt the homohexameric form and to obtain stable dimers in solution. Based on the results obtained from molecular dynamic simulations, a mutant with the most promising combination of mutations was identified. These specific mutations could potentially cause the breakdown of hexameric structure and result in the formation of stable dimers.

Item Type: Thesis (Diploma thesis)
Keywords: molecular dynamics, molecular mechanics, in silico mutations
Supervisor: Bertoša, Branimir
Date: 2012
Number of Pages: 27
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Grozdana Sirotic
Date Deposited: 29 May 2014 07:51
Last Modified: 24 Sep 2014 09:00
URI: http://digre.pmf.unizg.hr/id/eprint/1891

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