Researchers in Germany have developed a way to make simple, self-assembling DNA 'robots' that can rotate and function like latches. Combined, they can be used as nano-scale cargo carriers that respond to electromagnetic commands via remote control.
https://www.forbes.com/sites/fionamcmillan/2018/01/18/this-dna-robot-arm-rotates-under-remote-control/#3c8d5d678294
