STPR, a 23-Amino Acid Tandem Repeat Domain, Found in the Human Function-Unknown Protein ZNF821

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• 作者：Yasuhiro Nonaka ; Hideki Muto ; Tomoyasu Aizawa ; Etsuro Okabe ; Shohei Myoba ; Takuya Yokoyama ; Shin Saito ; Fumie Tatami ; Yasuhiro Kumaki ; Masakatsu Kamiya ; Takashi Kikukawa ; Mineyuki Mizuguchi ; Shigeharu
• 刊名：Biochemistry
• 出版年：2010
• 出版时间：September 28, 2010
• 年：2010
• 卷：49
• 期：38
• 页码：8367-8375
• 全文大小：1005K
• 年卷期：v.49,no.38(September 28, 2010)
• ISSN：1520-4995

文摘

The STPR motif is composed of 23-amino acid repeats aligned contiguously. STPR was originally reported as the DNA-binding domain of the silkworm protein FMBP-1. ZNF821, the human protein that contains the STPR domain, is a zinc finger protein of unknown function. In this study, we prepared peptides of silkworm FMBP-1 STPR (sSTPR) and human ZNF821 STPR (hSTPR) and compared their DNA binding behaviors. This revealed that hSTPR, like sSTPR, is a double-stranded DNA-binding domain. Sequence-independent DNA binding affinities and α-helix-rich DNA-bound structures were comparable between the two STPRs, although the specific DNA sequence of hSTPR is still unclear. In addition, a subcellular expression experiment showed that the hSTPR domain is responsible for the nuclear localization of ZNF821. ZNF821 showed a much slower diffusion rate in the nucleus, suggesting the possibility of interaction with chromosomal DNA. STPR sequences are found in many proteins from vertebrates, insects, and nematodes. Some of the consensus amino acid residues would be responsible for DNA binding and concomitant increases in α-helix structure content.