Glycosaminoglycan chain of dentin sialoprotein proteoglycan.

Glycosaminoglycan chain of dentin sialoprotein proteoglycan.
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DOI:
10.1177/0022034510366902
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发表时间:
2010-08
影响因子:
7.6
通讯作者:
Qin C
Qin C
中科院分区:
医学1区
文献类型:
--
作者:
Zhu Q;Sun Y;Prasad M;Wang X;Yamoah AK;Li Y;Feng J;Qin C

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牙本质唾液磷蛋白(DSPP)被加工成牙本质唾液蛋白(DSP)和牙本质磷蛋白。大鼠DSP的一种分子变体,称为“HMW-DSP”,已被推测为DSP的一种蛋白聚糖形式。为了确定HMW-DSP是否是DSP的蛋白聚糖形式,并确定糖胺聚糖侧链附着位点,我们进一步对HMW-DSP进行了表征。软骨素酶ABC处理降低了部分大鼠HMW-DSP的迁移率至DSP水平。双糖分析表明,大鼠HMW-DSP含有由硫酸软骨素-4组成的糖胺聚糖链,平均含有31-32个双糖/mol。这些观察结果证实HMW-DSP是DSP的蛋白聚糖形式(更名为“DSP- pg”)。Edman降解和质谱分析大鼠DSP-PG的色氨酸肽,以及小鼠DSPP候选丝氨酸残基的替换分析,证实了2条糖胺聚糖链连接到大鼠的Ser241和Ser253,或小鼠DSPP序列的Ser242和Ser254。
Dentin sialophosphoprotein (DSPP) is processed into dentin sialoprotein (DSP) and dentin phosphoprotein. A molecular variant of rat DSP, referred to as “HMW-DSP”, has been speculated to be a proteoglycan form of DSP. To determine if HMW-DSP is the proteoglycan form of DSP and to identify the glycosaminoglycan side-chain attachment site(s), we further characterized HMW-DSP. Chondroitinase ABC treatment reduced the migration rate for portions of rat HMW-DSP to the level of DSP. Disaccharide analysis showed that rat HMW-DSP contains glycosaminoglycan chains made of chondroitin-4-sulfate and has an average of 31–32 disaccharides/mol. These observations confirmed that HMW-DSP is the proteoglycan form of DSP (renamed “DSP-PG”). Edman degradation and mass spectrometric analyses of tryptic peptides from rat DSP-PG, along with substitution analyses of candidate Ser residues in mouse DSPP, confirmed that 2 glycosaminoglycan chains are attached to Ser241 and Ser253 in the rat, or Ser242 and Ser254 in the mouse DSPP sequence.
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