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Kathleen Postle
Larsen et al

His(20) provides the sole functionally significant side chain in the essential TonB transmembrane domain.

Larsen RA, Deckert GE, Kastead KA, Devanathan S, Keller KL, Postle K
J Bacteriol. 2007 Apr;189(7):2825-33. doi: 10.1128/JB.01925-06. Epub 2007 Feb 2. (Link opens in a new window) PubMed (Link opens in a new window) Article