Ramakrishnan and colleagues determined the complete molecular structure of the 30S subunit of the ribosome and its complexes with several antibiotics. "
The Abstract:
"Genetic information encoded in messenger RNA is translated into protein by the ribosome, which is a large nucleoprotein complex comprising two subunits, denoted 30S and 50S in bacteria. Here we report the crystal structure of the 30S subunit from Thermus thermophilus, refined to 3Å resolution. The final atomic model rationalizes over four decades of biochemical data on the ribosome, and provides a wealth of information about RNA and protein structure, protein-RNA interactions and ribosome assembly. It is also a structural basis for analysis of the functions of the 30S subunit, such as decoding, and for understanding the action of antibiotics. The structure will facilitate the interpretation in molecular terms of lower resolution structural data on several functional states of the ribosome from electron microscopy and crystallography." With Wimberly, Brian T.,  Brodersen, Ditlev E., Clemons, William M.,  Morgan-Warren, Robert J.,  Carter, Andrew P., Vonrhein, Clemens,  Hartsch, Thomas. 

See also:
Ramakirshan, V., Wimberly, Brian T., Carter, et al, "Functional insights from the structure of the 20S ribosomal subunit and its interactions with antibiotics," Nature, 407 (2000) 340-348. And, Ramakirschan, Venki. Gene machine: The race to decipher the secrets of the ribsome (2018).

In 2009 Ramakrishnan shared the Nobel Prize in Chemistry with Thomas A. Steitz and Ada E. Yonath "for studies of the structure and function of the ribosome."