Islamabad, Pakistan (CNN) Pakistan's Prime Minister Imran Khan is positioning himself as a political mediator, starting with the dispute between Saudi Arabia and Iran.

In an exclusive interview with CNN's Max Foster, the Pakistani cricket legend turned politician said that US President Donald Trump had asked him to help defuse tensions by acting as a "go-between" with Iran.

"What I like about him is he does not believe in wars," Khan said of the US President, speaking to CNN in Islamabad.

Khan met with Iranian President Hassan Rouhani in Tehran on Sunday, before traveling to Saudi Arabia on Tuesday, with the aim of facilitating talks between the arch rivals.

Khan said Trump had asked him last month to "try and be a go-between with Iran and the United States."

Read MoreBase Flipping in a GCGC Containing DNA Dodecamer: A Comparative Study of the Performance of the Nucleic Acid Force Fields, CHARMM, AMBER, and BMS.
The improving quality of empirical force field parameters along with other methodological improvements and ever increasing computational resources have lead to more reliable computations on biological macromolecules. In the case of oligonucleotides, three force fields, namely CHARMM27, AMBER4.1, and BMS, have been developed and are widely used by the simulation community. Testing of these force fields to date has primarily focused on their treatment of the canonical forms of DNA and RNA. However, many biological functions of oligonucleotides involve significant variation of their structures from the canonical forms. In the present work, the three force fields are evaluated via computation of potentials of mean force