2r1j: Difference between revisions

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[[Image:2r1j.jpg|left|200px]]
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{{STRUCTURE_2r1j|  PDB=2r1j  |  SCENE=  }}  
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'''Crystal Structure of the P22 c2 Repressor protein in complex with the synthetic operator 9T'''
===Crystal Structure of the P22 c2 Repressor protein in complex with the synthetic operator 9T===




==Overview==
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The P22 c2 repressor protein (P22R) binds to DNA sequence-specifically and helps to direct the temperate lambdoid bacteriophage P22 to the lysogenic developmental pathway. We describe the 1.6 A X-ray structure of the N-terminal domain (NTD) of P22R in a complex with a DNA fragment containing the synthetic operator sequence [d(ATTTAAGATATCTTAAAT)]2. This operator has an A-T base pair at position 9L and a T-A base pair at position 9R and is termed DNA9T. Direct readout: nondirectional van der Waals interactions between protein and DNA appear to confer sequence-specificity. The structure of the P22R NTD-DNA9T complex suggests that sequence-specificity arises substantially from lock-and-key interaction of a valine with a complementary binding cleft on the major groove surface of DNA9T. The cleft is formed by four methyl groups on sequential base pairs of 5'-TTAA-3'. The valine cleft is intrinsic to the DNA sequence and does not arise from protein-induced DNA conformational changes. Protein-DNA hydrogen bonding plays a secondary role in specificity. Indirect readout: it is known that the noncontacted bases in the center of the complex are important determinants of affinity. The protein induces a transition of the noncontacted region from B-DNA to B'-DNA. The B' state is characterized by a narrow minor groove and a zigzag spine of hydration. The free energy of the transition from B- to B'-DNA is known to depend on the sequence. Thus, the observed DNA conformation and hydration allows for the formulation of a predictive model of the indirect readout phenomenon.
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==About this Structure==
==About this Structure==
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[[Category: Transcription regulation]]
[[Category: Transcription regulation]]
[[Category: Transcription/dna complex]]
[[Category: Transcription/dna complex]]
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Revision as of 18:29, 28 July 2008

File:2r1j.png

Template:STRUCTURE 2r1j

Crystal Structure of the P22 c2 Repressor protein in complex with the synthetic operator 9T

Template:ABSTRACT PUBMED 18237194

About this Structure

2R1J is a Single protein structure of sequence from Enterobacteria phage p22. Full crystallographic information is available from OCA.

Reference

P22 c2 repressor-operator complex: mechanisms of direct and indirect readout., Watkins D, Hsiao C, Woods KK, Koudelka GB, Williams LD, Biochemistry. 2008 Feb 26;47(8):2325-38. Epub 2008 Feb 1. PMID:18237194

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