Abstract
Recombinant S-adenosylhomocysteine hydrolase from Corynebacterium glutamicum (CgSAHase) was covalently bound to Eupergit® C. The maximum yield of bound protein was 91% and the catalytic efficiency was 96.9%. When the kinetic results for the immobilized enzyme were compared with those for the soluble enzyme, no decrease in the catalytic efficiency of the former was detected. Both soluble and immobilized enzymes showed similar optimum pH and temperature ranges. The reuse of immobilized CgSAHase caused a loss of synthetic activity due to NAD+ release, although the binding to the support was sufficiently strong for up to 5 cycles with 95% conversion efficiency. The immobilized enzyme was incubated every 3 cycles with 100 μM NAD+ to recover the loss of activity after 5 cycles. This maintained the activity for another 50 cycles. The purification of S-adenosylhomocysteine (SAH) provided an overall yield of 76% and 98% purity as determined by HPLC and NMR analyses. The results indicate the suitability of immobilized CgSAHase for synthesizing SAH and other important S-nucleosidylhomocysteine.
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This work was partially supported by Programa de Ayuda a Grupos de Excelencia de la Región de Murcia, SÉNECA Foundation (04541/GERM/06, Plan de Ciencia y Tecnología 2007–2010) and by Consejo Nacional de Ciencia y Tecnología Proyecto Ciencia Básica 133949/2011-2013.
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Lozada-Ramírez, J.D., Sánchez-Ferrer, A. & García-Carmona, F. Enzymatic synthesis of S-adenosylhomocysteine: immobilization of recombinant S-adenosylhomocysteine hydrolase from Corynebacterium glutamicum (ATCC 13032). Appl Microbiol Biotechnol 93, 2317–2325 (2012). https://doi.org/10.1007/s00253-011-3769-2
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DOI: https://doi.org/10.1007/s00253-011-3769-2