= Uttam L. RajBhandary
{c}
= U. L. RajBhandary
{c}
{synonym}
\b[Uttam L. RajBhandary] studied how <RNA> structure determines recognition by <proteins>, particularly the different jobs of <transfer RNA> during <biological translation>. MIT's named profile connects Uttam RajBhandary with publications credited to RajBhandary, UL, including work on <initiator transfer RNA>.<Uttam RajBhandary faculty profile at MIT>[Research Summary and Key Publications, especially Initiator transfer RNAs]{ref}
With <B. L. Seong>, he tested whether conserved <base pairs> in the <anticodon> stem help distinguish an <initiator transfer RNA> from an <elongator transfer RNA>. The 1987 study replaced one, two or three G–C pairs with the corresponding elongator pattern and examined purified <transfer RNA> variants. Their initiation activity decreased even though they could still bind <bacterial initiation factor IF2>; AUG-dependent binding at the <ribosomal P site> was impaired.<Escherichia coli formylmethionine tRNA: mutations in GGGCCC sequence conserved in anticodon stem of initiator tRNAs affect initiation of protein synthesis and conformation of anticodon loop by B. L. Seong and U. L. RajBhandary>[Abstract, stem substitutions and comparison of initiation-factor and P-site binding]{ref}
The experiment separates carrying the right <amino acid> from being recognized at the right step. For an original counting example, suppose 100 charged carriers are presented to a simplified initiation assay, 80 reach a tested binding state, and 20 of those proceed to productive initiation. The productive fraction is $0.80\times0.25=0.20$. Equal charging or equal binding at an earlier state would not establish equal productive output. These stipulated counts illustrate sequential selection; they are not measured values from the paper.
\Image[https://biology.mit.edu/wp-content/uploads/2017/12/RajBhandary_Big.jpeg]
{title=Uttam RajBhandary, portrait identified by the MIT Department of Biology}
{height=300}
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