Linked Life Data

2476177

Source:http://linkedlifedata.com/resource/pubmed/id/2476177

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
14
pubmed:dateCreated
1989-10-26
pubmed:abstractText
Ethylnitrosourea is an alkylating reagent which preferentially modifies phosphates in nucleic acids. It was used to map phosphates in naked Escherichia coli 16S rRNA engaged in tertiary interactions through hydrogen bonds or ion coordination. Of the phosphates, 7% are found involved in such interactions, and 57% of them are located in loops or interhelical regions, where they are involved in maintaining local intrinsic structures or long-distance tertiary interactions. The other phosphates (43%) are found in helical regions. These phosphates often occur at the proximity of bulged nucleotides or in irregular helices containing noncanonical base pairs (and bulges) and are assumed to bind cations in order to neutralize negative charges and to stabilize unusual phosphate backbone folding. In the 30S subunit, ENU allowed mapping of phosphates in contact with proteins. The RNA is not uniformly engaged in RNA/protein interactions. Regions 1-51, 250-310, 567-612, 650-670, and 1307-1382 are particularly buried whereas the 3'-terminal domain and the 5'-proximal region (nucleotides 53-218) are exposed. The conformation of 16S rRNA is not drastically affected by protein binding, but conformational adjustments are detected in several defined regions. They are found in the 5' domain (region 147-172), in the central domain (region 827-872), in the 3' major domain (nucleotides 955-956, 994, 1054, 1181, 1257, and 1262-1263), and in the 3'-terminal domain (around 1400). The 50S subunit shields clusters of phosphates located at the subunit interface. The most extensive protections are observed in the 3'-terminal domain (1490-1542), in the central region of the molecule (770-930), and in the upper 3' major domain.(ABSTRACT TRUNCATED AT 250 WORDS)
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0006-2960
pubmed:author
pubmed:issnType
Print
pubmed:day
11
pubmed:volume
28
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
5847-55
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1989
pubmed:articleTitle
Probing the phosphates of the Escherichia coli ribosomal 16S RNA in its naked form, in the 30S subunit, and in the 70S ribosome.
pubmed:affiliation
Laboratoire de Biochimie, Institut de Biologie Moléculaire et Cellulaire du CNRS, Strasbourg, France.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't