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| {{STRUCTURE_1ml6| PDB=1ml6 | SCENE= }} | | {{STRUCTURE_1ml6| PDB=1ml6 | SCENE= }} |
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| '''Crystal Structure of mGSTA2-2 in Complex with the Glutathione Conjugate of Benzo[a]pyrene-7(R),8(S)-Diol-9(S),10(R)-Epoxide'''
| | ===Crystal Structure of mGSTA2-2 in Complex with the Glutathione Conjugate of Benzo[a]pyrene-7(R),8(S)-Diol-9(S),10(R)-Epoxide=== |
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| ==Overview==
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| Murine class alpha glutathione S-transferase subunit types A2 (mGSTA2-2) and A1 (mGSTA1-1) have high catalytic efficiency for glutathione (GSH) conjugation of the ultimate carcinogenic metabolite of benzo[a]pyrene, (+)-anti-7,8-dihydroxy-9,10-oxy-7,8,9,10-tetrahydrobenzo[a]pyrene, [(+)-anti-BPDE]. Only 10 residues differ between the sequences of mGSTA1-1 and 2-2. However, the catalytic efficiency of mGSTA1-1 for GSH conjugation of (+)-anti-BPDE is >3-fold higher as compared with mGSTA2-2. The crystal structure of mGSTA1-1 in complex with the GSH conjugate of (+)-anti-7,8-dihydroxy-9,10-oxy-7,8,9,10-tetrahydrobenzo[a]pyrene (GSBpd) reveals that R216 and I221 in the last helix play important roles in catalysis [Gu, Y., Singh, S. V., and Ji, X. (2000) Biochemistry 39, 12552-12557]. The crystal structure of mGSTA2-2 in complex with GSBpd has been determined, which reveals a different binding mode of GSBpd. Comparison of the two structures suggests that residues 207 and 221 are responsible for the different binding mode of GSBpd and therefore contribute to the distinct catalytic efficiency of the two isozymes.
| | The line below this paragraph, {{ABSTRACT_PUBMED_12549910}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 12549910 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_12549910}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Gst detoxification]] | | [[Category: Gst detoxification]] |
| [[Category: Mgsta2-2]] | | [[Category: Mgsta2-2]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 01:21:54 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Jul 3 00:14:46 2008'' |