Molecular basis of the recognition of the ap65-1 gene transcription promoter elements by a Myb protein from the protozoan parasite Trichomonas vaginalis

Ingjye Jiang, Chen Kun Tsai, Sheng Chia Chen, Szu Huan Wang, Imamaddin Amiraslanov, Chi Fon Chang, Wen Jin Wu, Jung Hsiang Tai, Yen Chywan Liaw, Tai Huang Huang

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14 Citations (Scopus)


Iron-inducible transcription of the ap65-1 gene in Trichomonas vaginalis involves at least three Myb-like transcriptional factors (tvMyb1, tvMyb2 and tvMyb3) that differentially bind to two closely spaced promoter sites, MRE-1/MRE-2r and MRE-2f. Here, we defined a fragment of tvMyb2 comprising residues 40-156 (tvMyb240-156) as the minimum structural unit that retains near full binding affinity with the promoter DNAs. Like c-Myb in vertebrates, the DNA-free tvMyb240-156 has a flexible and open conformation. Upon binding to the promoter DNA elements, tvMyb240-156 undergoes significant conformational re-arrangement and structure stabilization. Crystal structures of tvMyb240-156 in complex with promoter element-containing DNA oligomers showed that 5′-a/gACGAT-3′ is the specific base sequence recognized by tvMyb240-156, which does not fully conform to that of the Myb binding site sequence. Furthermore, Lys 49, which is upstream of the R2 motif (amino acids 52-102) also participates in specific DNA sequence recognition. Intriguingly, tvMyb240-156 binds to the promoter elements in an orientation opposite to that proposed in the HADDOCK model of the tvMyb135-141/MRE-1-MRE-2r complex. These results shed new light on understanding the molecular mechanism of Myb-DNA recognition and provide a framework to study the molecular basis of transcriptional regulation of myriad Mybs in T. vaginalis.

Original languageEnglish
Pages (from-to)8992-9008
Number of pages17
JournalNucleic Acids Research
Issue number20
Publication statusPublished - 2011 Nov 1


ASJC Scopus subject areas

  • Genetics

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