학술논문
Crystal structure of the flavin‐dependent thymidylate synthase Thy1 from Thermus thermophilus with an extra C‐terminal domain.
Document Type
Article
Author
Source
Subject
*THYMIDYLATE synthase
*THERMUS thermophilus
*CRYSTAL structure
*DIHYDROPYRIMIDINE dehydrogenase
*MOLECULES
*ENZYMES
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Language
ISSN
2053-230X
Abstract
The thymidylate synthases ThyA and Thy1 are enzymes that catalyse the formation of thymidine monophosphate from 2′‐deoxyuridine monophosphate. Thy1 (or ThyX) requires flavin for catalytic reactions, while ThyA does not. In the present study, the crystal structure of the flavin‐dependent thymidylate synthase Thy1 from Thermus thermophilus HB8 (TtThy1, TTHA1096) was determined in complex with FAD and phosphate at 2.5 Å resolution. TtThy1 is a tetrameric molecule like other Thy1 proteins, to which four FAD molecules are bound. In the crystal of TtThy1, two phosphate ions were bound to each dUMP‐binding site. The characteristic feature of TtThy1 is the existence of an extra C‐terminal domain (CTD) consisting of three α‐helices and a β‐strand. The function of the CTD is unknown and database analysis showed that this CTD is only shared by part of the Deinococcus–Thermus phylum. [ABSTRACT FROM AUTHOR]