5NMU

Structure of hexameric CBS-CP12 protein from bloom-forming cyanobacteria

5NMU の概要

• エントリーDOI: 10.2210/pdb5nmu/pdb
• 分子名称: CBS-CP12, CHLORIDE ION (3 entities in total)
• 機能のキーワード: cystathionine beta synthase domain, fusion protein, redox-regulation of photosynthesis, photosynthesis
• 由来する生物種: Microcystis aeruginosa PCC 7806
• タンパク質・核酸の鎖数: 3
• 化学式量合計: 69605.50

構造登録者

Hackenberg, C.,Hakanpaa, J.,Antonyuk, S.V.,Dittmann, E.,Lamzin, V.S. (登録日: 2017-04-07, 公開日: 2018-05-16, 最終更新日: 2024-11-06)

主引用文献

Hackenberg, C.,Hakanpaa, J.,Cai, F.,Antonyuk, S.,Eigner, C.,Meissner, S.,Laitaoja, M.,Janis, J.,Kerfeld, C.A.,Dittmann, E.,Lamzin, V.S.
Structural and functional insights into the unique CBS-CP12 fusion protein family in cyanobacteria.
Proc. Natl. Acad. Sci. U.S.A., 115:7141-7146, 2018

PubMed Abstract: Cyanobacteria are important photosynthetic organisms inhabiting a range of dynamic environments. This phylum is distinctive among photosynthetic organisms in containing genes encoding uncharacterized cystathionine β-synthase (CBS)-chloroplast protein (CP12) fusion proteins. These consist of two domains, each recognized as stand-alone photosynthetic regulators with different functions described in cyanobacteria (CP12) and plants (CP12 and CBSX). Here we show that CBS-CP12 fusion proteins are encoded in distinct gene neighborhoods, several unrelated to photosynthesis. Most frequently, CBS-CP12 genes are in a gene cluster with thioredoxin A (TrxA), which is prevalent in bloom-forming, marine symbiotic, and benthic mat cyanobacteria. Focusing on a CBS-CP12 from PCC 7806 encoded in a gene cluster with TrxA, we reveal that the domain fusion led to the formation of a hexameric protein. We show that the CP12 domain is essential for hexamerization and contains an ordered, previously structurally uncharacterized N-terminal region. We provide evidence that CBS-CP12, while combining properties of both regulatory domains, behaves different from CP12 and plant CBSX. It does not form a ternary complex with phosphoribulokinase (PRK) and glyceraldehyde-3-phosphate dehydrogenase. Instead, CBS-CP12 decreases the activity of PRK in an AMP-dependent manner. We propose that the novel domain architecture and oligomeric state of CBS-CP12 expand its regulatory function beyond those of CP12 in cyanobacteria.

PubMed: 29915055
DOI: 10.1073/pnas.1806668115

実験手法

X-RAY DIFFRACTION (2.15 Å)