Crystal structure of the reactive intermediate/imine deaminase A homolog from the Antarctic bacterium Psychrobacter sp. PAMC 21119
- Authors
- Kwon S.; Lee C.W.; Koh H.Y.; Park H.; Lee J.H.; Park H.H.
- Issue Date
- Feb-2020
- Publisher
- Elsevier B.V.
- Keywords
- Antarctic bacterium; Cold-adaptability; Deamination; Psychrophile; RidA
- Citation
- Biochemical and Biophysical Research Communications, v.522, no.3, pp 585 - 591
- Pages
- 7
- Journal Title
- Biochemical and Biophysical Research Communications
- Volume
- 522
- Number
- 3
- Start Page
- 585
- End Page
- 591
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/37877
- DOI
- 10.1016/j.bbrc.2019.11.139
- ISSN
- 0006-291X
1090-2104
- Abstract
- The RidA subfamily proteins catalyze the deamination reaction of enamine/imine intermediates, which are metabolites of amino acids such as threonine and serine. Numerous structural and functional studies have been conducted on RidA isolated from mesophiles and thermophiles. However, little is known about the structure of the RidA proteins isolated from psychrophiles. In the present study, we elucidated the crystal structure of RidA from the Antarctic bacterium Psychrobacter sp. PAMC 21119 (Pp-RidA) at 1.6 Å resolution to identify the structural properties contributing to cold-adaptability. Although the overall structure of Pp-RidA is similar to those of its homologues, it exhibits specific structural arrangements of a loop positioned near the active site, which is assumed to play a role in covering the active site of catalysis. In addition, the surface electrostatic potential of Pp-RidA suggested that it exhibits stronger electrostatic distribution relative to its homologues. Our results provide novel insights into the key determinants of cold-adaptability. © 2019 Elsevier Inc.
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