Completely abolished upon C-terminal deletion of Tho2p, flexible regions that could be involved in DNA binding. Recently, it has been shown that THO interacts directly with RNA polymerase II through its poly-phosphorylated C-terminal domain . To further assess whether disordered regions might be present in the other components of THO, we performed a search for disordered regions with the GlobPlot 2.3 prediction server using the full-length sequences of Mft1p, Thp2p, Tex1p, and Hpr1p. In this search we identified the following Cterminal regions as potentially disordered: Mft1p, residues 330– 396 ; Hpr1p, residues 703–752 ; Thp2p, residues 246–261, and Tex1p, residues 388–422. The disordered region of Tex1p, which is highly basic is adjacent to the likewise basic C-terminus of Tho2p in the model. We therefore speculate that the C-termini of Tex1p and Tho2p may work in conjunction to form a hybrid domain structure of highly positively charged residues, possibly important for chromatin and/or RNA binding. It is also possible that this positive patch interacts directly with the RNA polymerase II CTD through negatively charged, phosphorylated serine residues. The disordered regions of Mft1p, Hpr1p, and Thp2p are, in contrast, acidic with pI values of 4.01, 3.85, and 3.83, respectively. In fact, negatively charged, disordered regions occur more frequently than regions of positively charged nature in nuclear proteins, and these regions have been proposed to take part in transient protein-protein interactions by means of lowaffinity interactions. The C-terminal regions of Mft1p and Hpr1p may therefore constitute general interaction platforms required for protein-protein interactions during mRNP maturation. Consistent with this idea, recruitment of the export factors Sub2p and Mex67p to the THO complex during mRNP export is known to be facilitated through interaction with the Cterminus of Hpr1p, in which the Hpr1p-Mex67p interaction is dependent on ubiquitination of Hpr1p. Also, deletion of the Hpr1p C-terminus results in severe phenotypes including impaired mRNP formation and genomic instability, together suggesting an important role for the Hpr1p C-terminus in mRNA biogenesis. In conclusion, we have in this paper completed the architectural description of THO by localising each protein in the complex. Our model reveals the orientation and position of each subunit in the complex and provides new clues to explain the mechanistic details of this assembly. Further experimental evidence will now be needed to understand the molecular mechanisms underlying recruitment of the THO complex to active chromatin during early mRNA biogenesis as well as to determine the detailed three-dimensional structure of the complex. Over 100 million people in the Temozolomide United States suffer from chronic pain at some point in their lifetimes, making this one of the most widespread of medical conditions. Despite the prevalence of this condition, options are limited for patients seeking treatment. Non-steroidal anti-inflammatory drugs and opioid drugs, such as morphine, remain the most commonly prescribed.