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Article

Histidine-40 of ribonuclease T1 acts as base catalyst when the true catalytic base, glutamic acid-58, is replaced by alanine.

Biochemistry - 25 Sept 1990

Steyaert J, Hallenga K, Wyns L, Stanssens P

Abstract excerpt

Mechanisms for the ribonuclease T1 (RNase T1; EC 3.1.27.3) catalyzed transesterification reaction generally include the proposal that Glu58 and His92 provide general base and general acid assistance, respectively [Heinemann, U., & Saenger, W. (1982) Nature (London) 299, 27-31]. This view was recently challenged by the observation that mutants substituted at position 58 retain high residual activity; a revised...

Topics

Alanine
Amino Acids
Catalysis
Escherichia coli
Esterification
Exoribonucleases
Glutamates
Glutamic Acid
Histidine
Hydrogen-Ion Concentration
Kinetics
Magnetic Resonance Spectroscopy

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Identifiers

PMID: 1980211
DOI: 10.1021/bi00490a025

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PubMed metadata and Literature Corpus relationships. Corpus snapshot updated 29 Aug 2026. Prepared record publication-1980211-2026-08-29.1. Manifest publication-graph-cohort-2026-08-29.1.

Source receipt: PubMed via Helena Literature Corpus, retrieved 29 Aug 2026.

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