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Functional analysis of human S-adenosylhomocysteine hydrolase isoforms SAHH-2 and SAHH-3 (CROSBI ID 175071)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Fumić, Ksenija ; Belužić, Robert ; Ćuk, Mario ; Pavkov, Tea ; Kloor, Doris ; Barić, Ivo ; Mijić, Ivana ; Vugrek, Oliver Functional analysis of human S-adenosylhomocysteine hydrolase isoforms SAHH-2 and SAHH-3 // European journal of human genetics, 15 (2007), 3; 347-351. doi: 10.1038/sj.ejhg.5201757

Podaci o odgovornosti

Fumić, Ksenija ; Belužić, Robert ; Ćuk, Mario ; Pavkov, Tea ; Kloor, Doris ; Barić, Ivo ; Mijić, Ivana ; Vugrek, Oliver

engleski

Functional analysis of human S-adenosylhomocysteine hydrolase isoforms SAHH-2 and SAHH-3

S-adenosylhomocysteine hydrolase (AdoHcyase) catalyzes the hydrolysis of AdoHcy to adenosine and homocysteine. Increased levels of AdoHcy may play a role in the development of cardiovascular diseases and numerous other conditions associated with hyperhomocysteinemia. Several polymorphic isoforms named SAHH-1 to 4 may be resolved by horizontal starch gel electrophoresis from red blood cells. We have identified the genetic background of isoforms SAHH-2 and SAHH-3. SAHH-2 represents the previously described polymorphism in exon 2 of the AdoHcyase gene (112 C>T ; p.R38W). Isoform SAHH-3 is based on a new polymorphism in exon 3 (377 G>A), leading to the conversion of glycine to arginine at amino-acid position 123. To shed light on the effects of these polymorphisms on the molecular and catalytic properties of AdoHcyase, we made recombinant wild-type and polymorphic R38W and G123R enzymes for a comparative analysis. The amino-acid exchanges did not bring about major changes to the catalytic rates of the recombinant proteins. However, circular dichroism analysis showed that both polymorphisms effect the thermal stability of the recombinant protein in vitro, reducing the unfolding temperature by approximately 2.6°C (R38W) and 1.5°C (G123R) compared to wild-type protein. In view of the altered thermal stability, and slightly decreased enzymatic activity of polymorphic proteins (less than or equal to6%), one may consider the analyzed AdoHcyase isoforms as risk markers for diseases caused by irregular AdoHcyase metabolism.

AdoHcyase; recombinant protein; thermo sensitivity; circular dichroism; vascular disease

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Podaci o izdanju

15 (3)

2007.

347-351

objavljeno

1018-4813

10.1038/sj.ejhg.5201757

Povezanost rada

Biologija

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