Identification of critical amino acid residues and functional conservation of the Neurospora crassa and Rattus norvegicus orthologues of neuronal calcium sensor-1
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- 作者：Dibakar Gohain ; Rekha Deka ; Ranjan Tamuli
- 关键词：Calcium binding ; EF ; hand domain ; Heterologous expression ; N ; terminal myristoylation ; Neuronal calcium sensor ; 1 ; Neurospora crassa ; Rattus norvegicus ; Site ; directed mutagenesis ; Ultraviolet survival
- 刊名：Genetica
- 出版年：2016
- 出版时间：December 2016
- 年：2016
- 卷：144
- 期：6
- 页码：665-674
- 全文大小：953 KB
- 刊物类别：Biomedical and Life Sciences
- 刊物主题：Life Sciences
Life Sciences
Animal Genetics and Genomics
Plant Genetics and Genomics
Human Genetics
Microbial Genetics and Genomics - 出版者：Springer Netherlands
- ISSN：1573-6857
- 卷排序：144
文摘
Neuronal calcium sensor-1 (NCS-1) is a member of neuronal calcium sensor family of proteins consisting of an amino terminal myristoylation domain and four conserved calcium (Ca2+) binding EF-hand domains. We performed site-directed mutational analysis of three key amino acid residues that are glycine in the conserved site for the N-terminal myristoylation, a conserved glutamic acid residue responsible for Ca2+ binding in the third EF-hand (EF3), and an unusual non-conserved amino acid arginine at position 175 in the Neurospora crassa NCS-1. The N. crassa strains possessing the ncs-1 mutant allele of these three amino acid residues showed impairment in functions ranging from growth, Ca2+ stress tolerance, and ultraviolet survival. In addition, heterologous expression of the NCS-1 from Rattus norvegicus in N. crassa confirmed its interspecies functional conservation. Moreover, functions of glutamic acid at position 120, the first Ca2+ binding residue among all the EF-hands of the R. norvegicus NCS-1 was found conserved. Thus, we identified three critical amino acid residues of N. crassa NCS-1, and demonstrated its functional conservation across species using the orthologue from R. norvegicus.