Structures of Fission Yeast Inositol Pyrophosphate Kinase Asp1 in Ligand-Free, Substrate-Bound, and Product-Bound States

Benjamin, Bradley; Goldgur, Yehuda; Jork, Nikolaus; Jessen, Henning J.; Schwer, Beate; Shuman, Stewart

doi:10.1128/mbio.03087-22

Structures of Fission Yeast Inositol Pyrophosphate Kinase Asp1 in Ligand-Free, Substrate-Bound, and Product-Bound States

Journal Article · Mon Dec 05 00:00:00 EST 2022 · mBio (Online)

DOI:https://doi.org/10.1128/mbio.03087-22· OSTI ID:2423212

Benjamin, Bradley ^[1]; Goldgur, Yehuda ^[2]; Jork, Nikolaus ^[3]; Jessen, Henning J. ^[3]; Schwer, Beate ^[4]; Shuman, Stewart ^[2]

Memorial Sloan Kettering Cancer Center, New York, NY (United States); Gerstner Sloan Kettering Graduate School of Biomedical Sciences, New York, NY (United States)
Memorial Sloan Kettering Cancer Center, New York, NY (United States)
Univ. of Freiburg (Germany)
Cornell Univ., Ithaca, NY (United States). Weill Medical College

Expression of the fission yeast Schizosaccharomyces pombe phosphate regulon is sensitive to the intracellular level of the inositol pyrophosphate signaling molecule 1,5-IP₈. IP₈ dynamics are determined by Asp1, a bifunctional enzyme consisting of an N-terminal kinase domain and a C-terminal pyrophosphatase domain that catalyze IP₈ synthesis and catabolism, respectively. Here, we report structures of the Asp1 kinase domain, crystallized with two protomers in the asymmetric unit, one of which was complexed with ligands (ADPNP, ADP, or ATP; Mg²⁺ or Mn²⁺; IP₆, 5-IP₇, or 1,5-IP₈) and the other which was ligand-free. The ligand-free enzyme adopts an “open” conformation that allows ingress of substrates and egress of products. ADPNP, ADP, and ATP and associated metal ions occupy a deep phospho-donor pocket in the active site. IP₆ or 5-IP₇ engagement above the nucleotide favors adoption of a “closed” conformation, in which surface protein segments undergo movement and a disordered-to-ordered transition to form an inositol polyphosphate-binding site. In a structure mimetic of the kinase Michaelis complex, the anionic 5-IP₇ phosphates are encaged by an ensemble of nine cationic amino acids: Lys43, Arg223, Lys224, Lys260, Arg274, Arg285, Lys290, Arg293, and Lys341. Alanine mutagenesis of amino acids that contact the adenosine nucleoside of the ATP donor underscored the contributions of Asp258 interaction with the ribose 3'-OH and of Glu248 with adenine-N⁶. Changing Glu248 to Gln elicited a gain of function whereby the kinase became adept at using GTP as phosphate donor. Wild-type Asp1 kinase can utilize N⁶-benzyl-ATP as phosphate donor.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 2423212

Journal Information:: mBio (Online), Journal Name: mBio (Online) Journal Issue: 6 Vol. 13; ISSN 2150-7511

Publisher:: American Society for Microbiology (ASM)Copyright Statement

Country of Publication:: United States

Language:: English

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