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Cloning, expression, purification, crystallization and preliminary X‐ray diffraction analysis of tetrahydrodipicolinate‐N‐succinyltransferase (Rv1201c) from Mycobacterium tuberculosis

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Tetrahydrodipicolinate‐N‐succinyltransferase from Mycobacterium tuberculosis (DapD, Rv1201c) has been cloned, heterologously expressed in Escherichia coli, purified using standard chromatographic techniques and crystallized in the cubic space group I23 or I213. Preliminary diffraction data analysis indicates the presence of five molecules per asymmetric unit. Furthermore, the data exhibit icosahedral point‐group symmetry. One possible explanation for this is that the enzyme assembles into a 60‐mer exhibiting 235 point‐group symmetry and crystallizes as such in space group I23. In this case, the combination of crystallographic and noncrystallographic symmetry elements results in an arrangement of the icosahedrons in the cubic crystal with one pentamer in the asymmetric unit. Another explanation is that the packing of the molecules itself mimics icosahedral symmetry. In this case both space groups I23 and I213 would be possible.
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Keywords: DapD; Mycobacterium tuberculosis; tetrahydrodipicolinate‐N‐succinyltransferase

Document Type: Research Article

Affiliations: EMBL Hamburg Outstation, c/o DESY, Notkestrasse 85, D-22603 Hamburg, Germany

Publication date: September 1, 2008

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