A second riboswitch class for the enzyme cofactor NAD().

A second riboswitch class for the enzyme cofactor NAD().
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DOI:
10.1261/rna.077891.120
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发表时间:
2021-01
期刊:
RNA (New York, N.Y.)
影响因子:
--
通讯作者:
Breaker RR
Breaker RR
中科院分区:
其他
文献类型:
--
作者:
Panchapakesan SSS;Corey L;Malkowski SN;Higgs G;Breaker RR

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使用比较序列分析发现了几乎完全与pnuC基因相关的细菌非编码RNA基序。已知一些PnuC蛋白转运烟酰胺核苷(NR),其是普遍存在且丰富的酶辅因子烟酰胺腺嘌呤二核苷酸(NAD+)的组分。因此,我们推测新发现的“pnuC基序”RNA可能作为一类新型NAD+传感核糖开关的适体发挥作用。包含限定基序的保守核苷酸和二级结构特征的RNA构建体确实选择性地结合NAD+、烟酰胺单核苷酸(NMN)和NR。破坏适体的严格保守核苷酸的突变也破坏配体结合。这些生物信息学和生物化学发现表明,pnuC基序RNA可能是第二类核糖开关的成员,其响应于NAD+结合而调节基因表达。
A bacterial noncoding RNA motif almost exclusively associated with pnuC genes was uncovered using comparative sequence analysis. Some PnuC proteins are known to transport nicotinamide riboside (NR), which is a component of the ubiquitous and abundant enzyme cofactor nicotinamide adenine dinucleotide (NAD+). Thus, we speculated that the newly found “pnuC motif” RNAs might function as aptamers for a novel class of NAD+-sensing riboswitches. RNA constructs that encompass the conserved nucleotides and secondary structure features that define the motif indeed selectively bind NAD+, nicotinamide mononucleotide (NMN), and NR. Mutations that disrupt strictly conserved nucleotides of the aptamer also disrupt ligand binding. These bioinformatic and biochemical findings indicate that pnuC motif RNAs are likely members of a second riboswitch class that regulates gene expression in response to NAD+ binding.
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发表时间: 2012-10-19
期刊: Science (New York, N.Y.)
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