This domain is found at the C-terminal region of Hop2 and Mnd1 proteins. In meiotic DNA recombination, the Hop2-Mnd1 complex promotes Dmc1-mediated single-stranded DNA (ssDNA) invasion into homologous chromosomes to form a synaptic complex. Hop2 (fo ...
This domain is found at the C-terminal region of Hop2 and Mnd1 proteins. In meiotic DNA recombination, the Hop2-Mnd1 complex promotes Dmc1-mediated single-stranded DNA (ssDNA) invasion into homologous chromosomes to form a synaptic complex. Hop2 (for homologous pairing; also known as TBPIP) is expressed specifically during meiosis, same as Mnd1 (for meiotic nuclear divisions 1). The C-terminal region of both Hop2 and Mnd1, folds into three alpha-helices that are interrupted by two short non-helical regions. These alpha-helices of the two proteins together form a parallel coiled coil that provides the major interface for heterodimer formation. The non-helical regions form substantially kinked junctions between adjacent leucine zippers: the LZ1-LZ2 and LZ2-LZ3 junctions.This domain is the C-terminal segment of Hop2 and Mnd1 which folds back onto the C-terminal leucine zipper (LZ3) to form a helical bundle-like structure, hence designated LZ3wCH (for LZ3 with capping helices). The LZ3wCH region plays a role in interacting with the Dmc1 nucleofilament [1].
This family of proteins includes MND1 from S. cerevisiae. The mnd1 protein forms a complex with hop2 to promote homologous chromosome pairing and meiotic double-strand break repair [1].
This family consists of several eukaryotic TBP-1 interacting protein (TBPIP) sequences. TBP-1 has been demonstrated to interact with the human immunodeficiency virus type 1 (HIV-1) viral protein Tat, then modulate the essential replication process of ...
This family consists of several eukaryotic TBP-1 interacting protein (TBPIP) sequences. TBP-1 has been demonstrated to interact with the human immunodeficiency virus type 1 (HIV-1) viral protein Tat, then modulate the essential replication process of HIV. In addition, TBP-1 has been shown to be a component of the 26S proteasome, a basic multiprotein complex that degrades ubiquitinated proteins in an ATP-dependent fashion. Human TBPIP interacts with human TBP-1 then modulates the inhibitory action of human TBP-1 on HIV-Tat-mediated transactivation [1]. TBPIP was found to be an activator that specifically stimulates the homologous pairing catalyzed by DMC1. Family members also include yeast homologous-pairing protein 2 (Hop2) and its homologues from animals and plants. They are required for proper homologous pairing and efficient cross-over and intragenic recombination during meiosis [2, 3, 4, 5].