Abstract:
:A new two-dimensional crystal form of yeast RNA polymerase II was obtained in which the conformation of the enzyme appears "open", allowing entry of DNA, as required for the initiation of transcription. By contrast, a previous crystal form contained the enzyme in a "closed" conformation, appropriate for retention of DNA during RNA chain elongation. Interaction with two polymerase subunits, Rpb4 and Rpb7, favors the closed conformation, and binding of general transcription factor TFIIE may do so as well. The effect of Rpb4 and Rpb7, together with previous biochemical evidence, leads to the conclusion that the open to closed transition is a crucial step in the transcription initiation process.
journal_name
J Mol Bioljournal_title
Journal of molecular biologyauthors
Asturias FJ,Meredith GD,Poglitsch CL,Kornberg RDdoi
10.1006/jmbi.1997.1273subject
Has Abstractpub_date
1997-10-03 00:00:00pages
536-40issue
4eissn
0022-2836issn
1089-8638pii
S0022-2836(97)91273-0journal_volume
272pub_type
杂志文章abstract::The activation of vitamin D to its hormonal form is mediated by cytochrome P450 enzymes. CYP2R1 catalyzes the initial step converting vitamin D into 25-hydroxyvitamin D. A CYP2R1 gene mutation causes an inherited form of rickets due to 25-hydroxylase deficiency. To understand the narrow substrate specificity of CYP2R1...
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