G. N. Ramachandran

Gopalasamudram Narayana Ramachandran was born on October 8, 1922, in Ernakulam, a town in the princely state of Cochin on the southwestern coast of British India ^[1]. His father taught mathematics at a local college, and the household prized rigorous study. The boy showed an early aptitude for numbers and physical reasoning, and his family name, drawn from the ancestral village of Gopalasamudram in the Tamil country, followed the South Indian custom of placing lineage before the given name.

Ramachandran completed his schooling in Kerala and then moved to Tiruchirappalli, where he took his undergraduate degree in physics at St. Joseph's College, graduating at the top of his class ^[1]. In 1942 he joined the Indian Institute of Science in Bangalore. He initially enrolled in electrical engineering, but his interests pulled him toward pure physics, and he transferred to the physics department led by C. V. Raman, India's first Nobel laureate in science ^[2].

Under Raman he studied optics and the physics of crystals, earning a master's degree and then a doctorate from the University of Madras in 1947 for work carried out in Bangalore ^[2]. Raman's insistence on building instruments by hand and trusting one's own measurements left a lasting mark on the younger scientist. Anyone tracing who was G. N. Ramachandran before his fame finds a student trained in classical optics rather than biology, a background that later gave his structural work its mathematical edge.

After finishing his doctorate, Ramachandran traveled to England in 1947 to work at the Cavendish Laboratory in Cambridge, where he completed a second PhD under W. A. Wooster on the diffuse scattering of X-rays by crystals ^[1]. Cambridge in those years was alive with early structural biology; Lawrence Bragg directed the laboratory, and the groups that would soon solve the structures of DNA and the first proteins were forming around him. A conversation with Linus Pauling during this period is often cited as a spur to Ramachandran's later interest in biological molecules ^[3].

He returned to India in 1949, first as an assistant professor at the Indian Institute of Science. In 1952, at the age of twenty nine, he was appointed professor and head of the physics department at the University of Madras ^[2]. The vice chancellor, A. Lakshmanaswami Mudaliar, backed the young professor generously, and Ramachandran set about assembling an X-ray crystallography group in a city with little tradition in the field.

The decisive prompt came in 1952, when J. D. Bernal visited Madras and suggested that the structure of collagen, the fibrous protein of skin, tendon, and bone, remained an open and important problem ^[3]. Pauling had recently announced the alpha helix for other proteins, but collagen resisted every proposed model. Ramachandran took up the challenge with locally available fibers, including kangaroo tail tendon obtained through colleagues, and began collecting diffraction photographs ^[4].

In 1954 Ramachandran and his student Gopinath Kartha published a proposal in Nature that collagen consists of three polypeptide chains wound around a common axis, and in 1955 they refined it into the coiled coil triple helix stabilized by hydrogen bonds ^[4]. The model drew sharp criticism, notably from Francis Crick and Alexander Rich, who offered a rival version, and the dispute ran for years. The structure accepted today descends directly from the Madras model, and the episode announced that a laboratory in South India could compete at the frontier of molecular biology ^[3].

His second landmark came from thinking about why some arrangements of a protein chain are possible and others are not. With C. Ramakrishnan and V. Sasisekharan, he examined the two torsion angles, phi and psi, that define the backbone conformation at each amino acid, and calculated which combinations avoid atomic collisions. The resulting two dimensional map, published in the Journal of Molecular Biology in 1963, became known as the Ramachandran plot ^[5]. Every protein structure determined since is checked against it, and the diagram appears in virtually all biochemistry textbooks, making it one of the most widely used conceptual tools in structural biology ^[6].

Ramachandran's range extended beyond proteins. In 1971, working with A. V. Lakshminarayanan, he published a convolution based method for reconstructing three dimensional images from X-ray projections ^[7]. This mathematics fed directly into the algorithms used in computed tomography, the CT scanners that entered hospitals in the following decade. Among G. N. Ramachandran achievements, colleagues also count his studies of anomalous scattering for solving crystal structures and his founding of the journal current in his field's Indian community. He established the Department of Crystallography and Biophysics at Madras and, from 1970, the Molecular Biophysics Unit at the Indian Institute of Science in Bangalore, both of which trained generations of Indian structural biologists ^[2].

Ramachandran married Rajalakshmi in 1945, and the couple had two sons and a daughter ^[1]. Rajalakshmi was by all accounts a steady presence through his intense working years, managing the household while he kept long laboratory hours. Her death in 1998 was a blow from which friends said he never fully recovered ^[2].

Beyond science, he had serious interests in Indian philosophy and classical music, and he played the violin. In his later years he wrote about connections between physics, logic, and the Advaita Vedanta tradition, publishing speculative essays that puzzled some colleagues but reflected a lifelong habit of ranging widely ^[3]. People who worked with him describe a demanding, fast thinking supervisor who expected calculations to be checked by hand and who could be impatient with sloppiness, yet who gave students full credit on the papers they earned.

Ramachandran left Madras in 1970 after administrative frictions and moved to the Indian Institute of Science in Bangalore, where he built the Molecular Biophysics Unit into a leading center ^[2]. He also held visiting positions abroad, including a professorship at the University of Chicago, but he consistently chose to base his career in India when many contemporaries emigrated ^[3].

His final decades brought recognition and hardship in uneven measure. He was elected a Fellow of the Royal Society of London in 1977 and received the Ewald Prize of the International Union of Crystallography in 1999 for his lifetime contributions ^[6]. At the same time his health declined: he suffered a stroke, and Parkinson's disease progressively limited his movement. After Rajalakshmi's death he lived quietly in Chennai, where he died on April 7, 2001, at the age of seventy eight ^[1].

The question of the Nobel Prize shadowed these years. Several structural biologists have written that the collagen triple helix and the Ramachandran plot together merited the award, and his name was reportedly considered, but the call from Stockholm never came ^[3]. He expressed disappointment privately, though he continued to publish into the 1990s.

Few scientists have a fundamental diagram named after them that is used daily across the world. The Ramachandran plot remains the standard validation tool for every newly solved protein structure, embedded in the software of the Protein Data Bank and taught in first courses on biochemistry ^[5]. The collagen triple helix, refined by later workers, still rests on the geometry he and Kartha laid out in Madras in the mid 1950s ^[4].

In India his institutional legacy is equally concrete. The departments he founded in Madras and Bangalore continue as active research centers, and his students and their students populate structural biology groups across the country. The Indian National Science Academy and other bodies have instituted lectures and medals in his memory, and any G. N. Ramachandran biography written for Indian readers presents him as proof that world class science could be done at home with limited equipment and strong ideas ^[2].

Internationally, historians of molecular biology now place him alongside Pauling, Crick, and Bernal in accounts of how protein structure was understood. A memoir in Nature Structural Biology at his death called attention to how much he achieved with how little, and biographical memoirs by the Royal Society and Indian academies preserve the record of his work ^[6]. For students collecting G. N. Ramachandran facts, the essentials are simple: born in Ernakulam in 1922, trained under Raman, author of the collagen triple helix and the conformational map that bears his name, died in Chennai in 2001, and remembered wherever proteins are studied ^[1].