277d
From Proteopedia
| Line 1: | Line 1: | ||
[[Image:277d.jpg|left|200px]] | [[Image:277d.jpg|left|200px]] | ||
| - | + | <!-- | |
| - | + | The line below this paragraph, containing "STRUCTURE_277d", creates the "Structure Box" on the page. | |
| - | + | You may change the PDB parameter (which sets the PDB file loaded into the applet) | |
| - | + | or the SCENE parameter (which sets the initial scene displayed when the page is loaded), | |
| - | | | + | or leave the SCENE parameter empty for the default display. |
| - | | | + | --> |
| - | + | {{STRUCTURE_277d| PDB=277d | SCENE= }} | |
| - | + | ||
| - | + | ||
| - | }} | + | |
'''SUBSTITUTIONS AT C2' OF DAUNOSAMINE IN THE ANTICANCER DAUNORUBICIN ALTER ITS DNA-BINDING SEQUENCE SPECIFICITY''' | '''SUBSTITUTIONS AT C2' OF DAUNOSAMINE IN THE ANTICANCER DAUNORUBICIN ALTER ITS DNA-BINDING SEQUENCE SPECIFICITY''' | ||
| Line 26: | Line 23: | ||
[[Category: Priebe, W.]] | [[Category: Priebe, W.]] | ||
[[Category: Wang, A H.J.]] | [[Category: Wang, A H.J.]] | ||
| - | [[Category: | + | [[Category: Complexed with drug]] |
| - | [[Category: | + | [[Category: Double helix]] |
| - | [[Category: | + | [[Category: Modified]] |
| - | [[Category: | + | [[Category: Right handed dna]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 18:25:07 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 15:25, 3 May 2008
SUBSTITUTIONS AT C2' OF DAUNOSAMINE IN THE ANTICANCER DAUNORUBICIN ALTER ITS DNA-BINDING SEQUENCE SPECIFICITY
Overview
In the search for new generations of anthracycline drugs, lower cytotoxic side effect and higher activity toward resistant cancer cells are two major goals. A new anthracycline drug, WP401 (2'-bromo-4'-epidaunorubicin, alpha-manno configuration), exhibits promising activity toward multidrug-resistant cells. In contrast, the related compound WP400 (2'-bromo-4'-epidaunorubicin, alpha-gluco configuration), is significantly less cytotoxic. To establish the structural and molecular bases of this observation, we performed X-ray diffraction analyses of the complexes between WP401 and four DNA hexamers CGTACG, CGATCG, CGCGCG, and CGGCCG. Their crystal data (space group P4(1)2(1)2, a = b approximately 2.8 nm, c approximately 5.3 nm) are similar to those of other daunorubicin/doxorubicin complexes. The refined crystal structures at 0.18-nm resolution revealed that two WP401 drug molecules bind to the duplex, with the aglycons intercalated between the CpG steps and their modified daunosamines in the minor groove. The bulky bromine atom at the C2' position caused the daunosamine of the bound WP401 to adopt a different conformation from that of the bound daunorubicin. In the presence of formaldehyde, WP401 formed a covalent adduct with CGGCCG more readily than with CGCGCG. This is the opposite of what is seen for daunorubicin and doxorubicin. Thus modifications at the C2' position of daunosamine modulate the sequence specificity of the formaldehyde-crosslinking reactions between anthracyclines and DNA.
About this Structure
Full crystallographic information is available from OCA.
Reference
Substitutions at C2' of daunosamine in the anticancer drug daunorubicin alter its DNA-binding sequence specificity., Gao YG, Priebe W, Wang AH, Eur J Biochem. 1996 Sep 1;240(2):331-5. PMID:8841395 Page seeded by OCA on Sat May 3 18:25:07 2008
