Spinning sugars in antigen biosynthesis: a direct study of the Coxiella burnetii and Streptomyces griseus TDP-sugar epimerases
Spinning sugars in antigen biosynthesis: a direct study of the Coxiella burnetii and Streptomyces griseus TDP-sugar epimerases
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抗原生物合成中的旋转糖:伯内特柯克斯体和灰色链霉菌 TDP-糖差向异构酶的直接研究
DOI:
10.1101/2021.10.25.465559
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Cross A
中科院分区:
文献类型:
--
作者:
Cross A
The sugars streptose and dihydrohydroxystreptose (DHHS) are unique to the bacteriaStreptomyces griseusandCoxiella burnetiirespectively. Streptose forms the central moiety of the antibiotic streptomycin, whilst DHHS is found in the O-antigen of the zoonotic pathogenC. burnetii. Biosynthesis of these sugars has been proposed to follow a similar path to that of TDP-rhamnose, catalysed by the enzymes RmlA/RmlB/RmlC/RmlD. Streptose and DHHS biosynthesis unusually require a ring contraction step that might be performed by the orthologues of RmlC or RmlD. Genome sequencing ofS. griseusandC. burnetiiproposed the StrM and CBU1838 proteins respectively as RmlC orthologues. Here, we demonstrate through both coupled and direct observation studies that both enzymes can perform the RmlC 3’’,5’’ double epimerisation activity; and that this activity supports TDP-rhamnose biosynthesis in vivo. We demonstrate that proton exchange is faster at the 3’’ position than the 5’’ position, in contrast to a previously studied orthologue. We solved the crystal structures of CBU1838 and StrM in complex with TDP and show that they form an active site highly similar to previously characterised enzymes. These results further support the hypothesis that streptose and DHHS are biosynthesised using the TDP pathway and are consistent with the ring contraction step being performed on a double epimerised substrate, most likely by the RmlD paralogue. This work will support the determination of the full pathways for streptose and DHHS biosynthesis.
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影响因子:
4.6
作者:
Koller F;Lassak J
通讯作者:
Lassak J
DOI:
10.1186/s13690-017-0248-y
发表时间:
2018
期刊:
Archives of public health = Archives belges de sante publique
影响因子:
--
作者:
Mori M;Roest HJ
通讯作者:
Roest HJ
影响因子:
4.3
作者:
Anastacio, S.;Carolino, N.;da Silva, G. J.
通讯作者:
da Silva, G. J.
影响因子:
12
作者:
J. Zuckerman;P. van Damme;K. Van Herck;T. Löscher
通讯作者:
T. Löscher
影响因子:
3.7
作者:
Clark NJ;Soares Magalhães RJ
通讯作者:
Soares Magalhães RJ