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Structural analysis of adenylate cyclases from Trypanosoma brucei in their monomeric state
Author(s) -
Bieger Boris,
Essen LarsOliver
Publication year - 2001
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.1093/emboj/20.3.433
Subject(s) - trypanosoma brucei , biology , allosteric regulation , mutagenesis , adenylate kinase , biochemistry , mutant , binding site , stereochemistry , biophysics , microbiology and biotechnology , enzyme , chemistry , gene
Cyclic AMP is a major trigger of the differentiation process of Trypanosoma brucei , a bloodstream parasite causing sleeping sickness. Its generation in trypanosomes is accomplished by a unique battery of membrane‐bound adenylate cyclases (ACs). We have determined the high‐resolution X‐ray structures of the catalytic domains of two trypanosomal ACs (tACs), GRESAG4.1 and GRESAG4.3. The tAC domains are structurally highly related to the AC domains of higher eukaryotes, but also comprise a highly conserved structural element near the active site, the Δ‐subdomain. A cavity below the Δ‐subdomain might correspond to an allosteric regulator site as indicated by the stereospecific binding of a single (2 S ,3 S )‐1,4‐ dimercapto‐2,3‐butanediol molecule. In three different crystal forms, the tAC domains are exclusively observed in a monomeric, catalytically inactive state. Biochemical analysis and the mutagenesis profile of GRESAG4.1 confirmed a common catalytic mechanism of tACs that involves transient dimerization of the AC domain. A low dimerization tendency might play a regulatory role in T.brucei if the activation of tACs is similarly driven by ligand‐induced dimerization as in membrane‐bound guanylate cyclases.