Molecular heterogeneity and alternative splicing of human lactoperoxidase.

Molecular heterogeneity and alternative splicing of human lactoperoxidase.
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DOI:
10.1016/j.abb.2008.11.015
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发表时间:
2009-02
影响因子:
3.9
通讯作者:
Conner, Gregory E.
Conner, Gregory E.
中科院分区:
生物学3区
文献类型:
--
作者:
Fragoso, Miryam A.;Torbati, Aliza;Fregien, Nevis;Conner, Gregory E.

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人乳过氧化物酶(LPO)以两个独立于糖基化的不同分子存在。其中一种形式的N-末端被阻断,尚未被鉴定,而另一种形式类似于髓过氧化物酶,在N-末端被蛋白质降解处理。我们的分析确定了选择性剪接的人LPO mRNAs,这可能解释了观察到的LPO的分子异质性。两个mRNAs省略了编码外显子的前肽,保留了编码分泌信号的5‘外显子,这与异质性一致,表明前肽可能具有功能作用。利用杆状病毒表达了两种形式的LPO,两种形式的LPO具有相似的酶活性。对胰酶消化、部分纯化的唾液LPO进行LC/MS/MS分析,证实唾液中存在较大的未加工LPO。为了比较不同的表达模式,针对纯化的重组(RhLPO)以及编码前肽区域的外显子内的抗原肽序列,制备了抗血清。免疫组织化学显示,与其他形式的LPO相比,proLPO在腺体细胞中的定位不同。这些数据提示,剪接变异体可能有助于LPO分子的异质性,并通过细胞内的间隔室定位对其进行调控。
Human lactoperoxidase (LPO) exists as two distinct molecules independent of glycosylation. The N-terminus of one form is blocked and has not been identified while the other is proteolytically processed at the N-terminus similar to myeloperoxidase. Our analysis identified alternatively spliced human LPO mRNAs that may explain the observed molecular heterogeneity of LPO. Two mRNAs omit propeptide encoding exons while retaining the 5′ exon encoding the secretion signal, consistent with the heterogeneity and suggesting a possible functional role for the propeptide. Two LPO forms were expressed using baculovirus and both showed similar enzyme activity. LC/MS/MS analysis of trypsin digested, partially purified, salivary LPO confirmed the larger unprocessed LPO is present in saliva. To compare variant expression patterns, antisera were raised against purified recombinant (rhLPO) as well as against an antigenic peptide sequence within the exons encoding the propeptide region. Immunohistochemistry demonstrated proLPO was differently localized within gland cells compared to other forms of LPO. The data suggested splice variants may contribute to LPO molecular heterogeneity and its regulation by intracellular compartmental localization.
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