Variant minihelix RNAs reveal sequence‐specific recognition of the helical tRNA(Ser) acceptor stem by E.coli seryl‐tRNA synthetase.
Variant minihelix RNAs reveal sequence‐specific recognition of the helical tRNA(Ser) acceptor stem by E.coli seryl‐tRNA synthetase.
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变体微型螺旋 RNA 揭示了大肠杆菌丝氨酰-tRNA 合成酶对螺旋 tRNA(Ser) 受体茎的序列特异性识别。
DOI:
10.1002/j.1460-2075.1996.tb00645.x
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发表时间:
1996
期刊:
影响因子:
--
通讯作者:
Jeffrey R. Sampson
中科院分区:
文献类型:
--
作者:
M. Saks;Jeffrey R. Sampson
Aminoacylation rate determinations for a series of variant RNA minihelix substrates revealed that Escherichia coli seryl‐tRNA synthetase (SerRS) recognizes the 1–72 through 5–68 base pairs of the E.coli tRNA(Ser) acceptor stem with the major recognition elements clustered between positions 2–71 and 4–69. The rank order of effects of canonical base pair substitutions at each position on kcat/Km was used to assess the involvement of major groove functional groups in recognition. Conclusions based on the biochemical data are largely consistent with the interactions revealed by the refined structure of the homologous Thermus thermophilus tRNA(Ser)‐SerRS complex that Cusack and colleagues report in the accompanying paper. Disruption of an end‐on hydrophobic interaction between the major groove C5(H) of pyrimidine 69 and an aromatic side chain of SerRS is shown to significantly decrease kcat/Km of a minihelix substrate. This type of interaction provides a means by which proteins can recognize the binary information of ‘degenerate’ sequences, such as the purine‐pyrimidine base pairs of tRNA(Ser). The 3–70 base pair is shown to contribute to recognition by SerRS even though it is not contacted specifically by the protein. The latter effect derives from the organization of the specific contacts that SerRS makes with the neighboring 2–71 and 4–69 acceptor stem base pairs.
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影响因子:
14.9
作者:
SAMPSON, JR;SAKS, ME
通讯作者:
SAKS, ME
DOI:
10.1073/pnas.83.24.9373
发表时间:
1986-12-01
影响因子:
11.1
作者:
FREIER, SM;KIERZEK, R;TURNER, DH
通讯作者:
TURNER, DH
DOI:
10.1073/pnas.89.1.65
发表时间:
1992
影响因子:
11.1
作者:
Martinis,SA;Schimmel,P
通讯作者:
Schimmel,P
影响因子:
3.9
作者:
Wright,DJ;Martinis,SA;Jahn,M;Söll,D;Schimmel,P
通讯作者:
Schimmel,P
影响因子:
56.9
作者:
Kevin M. Weeks;Donald M. Crothers
通讯作者:
Kevin M. Weeks;Donald M. Crothers