Definition: In this task, you're given a paragraph from the research paper and your task is to generate a suitable title for the research paper based on the given paper. Under 100 words is a good title length.
Input: New World (NW) hemorrhagic fever arenaviruses are rodent-borne agents that cause severe human disease. The GP1 subunit of the surface glycoprotein (GP) mediates cell attachment through transferrin receptor 1 (TfR1). We report the structure of Machupo virus (MACV) GP1 bound with human TfR1. Atomic details of the GP1:TfR1 interface clarify the importance of TfR1 residues implicated in NW arenavirus host specificity. Analysis of sequence variation among NW arenavirus GP1s and their host-species receptors in light of the molecular structure indicates determinants of viral zoonotic transmission. Infectivities of pseudoviruses in cells expressing mutated TfR1 confirm that contacts at the tip of the TfR1 apical domain determine the capacity of human TfR1 to mediate infection by particular NW arenaviruses. We propose that NW arenaviruses pathogenic to humans fortuitously acquired affinity for human TfR1 during adaptation to TfR1 of their natural hosts.

Structural basis for receptor recognition by New World hemorrhagic fever arenaviruses Accession codes The coordinates for the structure of MACV GP1 bound to hTfR1 have been deposited in the Protein Data Bank with accession code 3KAS. HHS Public Access Author manuscript