[English] 日本語
EMN Papers
- Database of articles cited by 3DEM data entries -

+
Search query

Keywords
Author
Journal
IF

-
Structure paper

TitleCryo-EM structure of a 40 kDa SAM-IV riboswitch RNA at 3.7 Å resolution.
Journal, issue, pagesNat Commun, Vol. 10, Issue 1, Page 5511, Year 2019
Publish dateDec 3, 2019
AuthorsKaiming Zhang / Shanshan Li / Kalli Kappel / Grigore Pintilie / Zhaoming Su / Tung-Chung Mou / Michael F Schmid / Rhiju Das / Wah Chiu /
PubMed AbstractSpecimens below 50 kDa have generally been considered too small to be analyzed by single-particle cryo-electron microscopy (cryo-EM). The high flexibility of pure RNAs makes it difficult to obtain ...Specimens below 50 kDa have generally been considered too small to be analyzed by single-particle cryo-electron microscopy (cryo-EM). The high flexibility of pure RNAs makes it difficult to obtain high-resolution structures by cryo-EM. In bacteria, riboswitches regulate sulfur metabolism through binding to the S-adenosylmethionine (SAM) ligand and offer compelling targets for new antibiotics. SAM-I, SAM-I/IV, and SAM-IV are the three most commonly found SAM riboswitches, but the structure of SAM-IV is still unknown. Here, we report the structures of apo and SAM-bound SAM-IV riboswitches (119-nt, ~40 kDa) to 3.7 Å and 4.1 Å resolution, respectively, using cryo-EM. The structures illustrate homologies in the ligand-binding core but distinct peripheral tertiary contacts in SAM-IV compared to SAM-I and SAM-I/IV. Our results demonstrate the feasibility of resolving small RNAs with enough detail to enable detection of their ligand-binding pockets and suggest that cryo-EM could play a role in structure-assisted drug design for RNA.
External linksNat Commun / PubMed:31796736 / PubMed Central
MethodsEM (single particle)
Resolution3.7 - 4.1 Å
Structure data

EMDB-20755, PDB-6ues:
Apo SAM-IV Riboswitch
Method: EM (single particle) / Resolution: 3.7 Å

EMDB-20756, PDB-6uet:
SAM-bound SAM-IV riboswitch
Method: EM (single particle) / Resolution: 4.1 Å

Chemicals

ChemComp-SAM:
S-ADENOSYLMETHIONINE

Source
  • Helicobacter pylori (bacteria)
  • mycobacterium sp. mcs (bacteria)
KeywordsRNA / SAM-IV riboswitch / Cryo-EM / Small RNA

+
About EMN Papers

-
News

-
Feb 9, 2022. New format data for meta-information of EMDB entries

New format data for meta-information of EMDB entries

  • Version 3 of the EMDB header file is now the official format.
  • The previous official version 1.9 will be removed from the archive.

Related info.:EMDB header

External links:wwPDB to switch to version 3 of the EMDB data model

-
Oct 5, 2021. Nobel Prize for mechanically activated and temperature-gated ion channels

Nobel Prize for mechanically activated and temperature-gated ion channels

  • The Nobel Prize in Physiology or Medicine 2021 was awarded jointly to David Julius and Ardem Patapoutian "for their discoveries of receptors for temperature and touch."
  • EM Navigator can help to find cryo-EM structure data by both pioneers.

External links:The Nobel Prize in Physiology or Medicine 2021 - NobelPrize.org / Structure data by Ardem Patapoutian / Structure data by David Julius

+
Aug 12, 2020. Covid-19 info

Covid-19 info

URL: https://pdbjlvh1.pdbj.org/emnavi/covid19.php

New page: Covid-19 featured information page in EM Navigator.

Related info.:Covid-19 info / Mar 5, 2020. Novel coronavirus structure data

+
Mar 5, 2020. Novel coronavirus structure data

Novel coronavirus structure data

Related info.:Yorodumi Speices / Aug 12, 2020. Covid-19 info

External links:COVID-19 featured content - PDBj / Molecule of the Month (242):Coronavirus Proteases

+
Jul 5, 2019. Downlodablable text data

Downlodablable text data

Some data of EM Navigator services can be downloaded as text file. Software such as Excel can load the data files.

PageDataFormat
EMN Searchsearch resultCSV, TSV, or JSON
EMN statisticsdata tableCSV or TSV

Related info.:EMN Search / EMN Statistics

-
EMN Papers

Database of articles cited by 3DEM data entries

  • Database of articles cited by 3DEM data entries in EMDB and PDB
  • Using PubMed data

Related info.:EMDB / PDB / Q: What are the data sources of EM Navigator? / EM Navigator / Yorodumi Papers / Changes in new EM Navigator and Yorodumi

Read more