Naturally occurring UBIAD1 mutations differentially affect menaquinone biosynthesis and vitamin K-dependent carboxylation.
Naturally occurring UBIAD1 mutations differentially affect menaquinone biosynthesis and vitamin K-dependent carboxylation.
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DOI:
10.1111/febs.16291
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发表时间:
2022-05
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影响因子:
--
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中科院分区:
文献类型:
--
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UbiA prenyltransferase domain-containing protein-1 (UBIAD1) is responsible for the biosynthesis of menaquinone-4 (MK-4), a cofactor for extrahepatic carboxylation of vitamin K-dependent (VKD) proteins. Genetic variations of UBIAD1 are mainly associated with Schnyder corneal dystrophy (SCD), a disease characterized by abnormal accumulation of cholesterol in the cornea. Results from in vitro studies demonstrate that SCD-associated UBIAD1 mutations are defective in MK-4 biosynthesis. However, SCD patients do not exhibit typical phenotypes associated with defects of MK-4 or VKD carboxylation. Here, we coupled UBIAD1’s biosynthetic activity of MK-4 with VKD carboxylation in HEK293 cells that stably express a chimeric VKD reporter protein. The endogenous Ubiad1 gene in these cells were knocked out by CRISPR-Cas9-mediated genome editing. The effect of UBIAD1 mutations on MK-4 biosynthesis and VKD carboxylation were evaluated in Ubiad1-deficient reporter cells by determining the production of MK-4 or by measuring the efficiency of reporter-protein carboxylation. Our results show that the hot-spot mutation N102S has a moderate impact on MK-4 biosynthesis (retained ~82% activity) but does not affect VKD carboxylation. However, the G186R mutation significantly affected both MK-4 biosynthesis and VKD carboxylation. Other mutations exhibit varying degrees of effects on MK-4 biosynthesis and VKD carboxylation. These results are consistent with in vivo results obtained from gene knock-in mice and SCD patients. Our findings suggest that UBIAD1’s MK-4 biosynthetic activity does not directly correlate with the phenotypes of SCD patients. The established cell-based assays in this study provide a powerful tool for the functional studies of UBIAD1 in a cellular milieu.
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影响因子:
20.3
作者:
Hao, Zhenyu;Jin, Da-Yun;Tie, Jian-Ke
通讯作者:
Tie, Jian-Ke
DOI:
10.1111/jth.15209
发表时间:
2021-03
期刊:
Journal of thrombosis and haemostasis : JTH
影响因子:
--
作者:
Chen X;Liu Y;Furukawa N;Jin DY;Paul Savage G;Stafford DW;Suhara Y;Williams CM;Tie JK
通讯作者:
Tie JK
影响因子:
1.9
作者:
Lin BR;Frausto RF;Vo RC;Chiu SY;Chen JL;Aldave AJ
通讯作者:
Aldave AJ
DOI:
10.3109/13816818609058041
发表时间:
1986-03-01
期刊:
OPHTHALMIC PAEDIATRICS AND GENETICS
影响因子:
--
作者:
LISCH, W;WEIDLE, EG;UTERMANN, G
通讯作者:
UTERMANN, G
影响因子:
3.7
作者:
Cholesterol Treatment Trialists' (CTT) Collaboration;Emberson JR;Kearney PM;Blackwell L;Newman C;Reith C;Bhala N;Holland L;Peto R;Keech A;Collins R;Simes J;Baigent C
通讯作者:
Baigent C