Site-specific glycation of lens crystallins by ascorbic acid.

Site-specific glycation of lens crystallins by ascorbic acid.
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抗坏血酸对晶状体晶状体蛋白进行位点特异性糖化。

DOI:
10.1016/0304-4165(92)90081-5
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发表时间:
1992
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Smith,JB
Smith,JB
中科院分区:
--
文献类型:
--
作者:
Ortwerth,BJ;Slight,SH;Prabhakaram,M;Sun,Y;Smith,JB

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抗坏血酸的氧化导致形成能够通过美拉德反应与蛋白质氨基反应的几种化合物。在存在NaCNBH 3的情况下,[1- 14 C]抗坏血酸的放射性在10天内线性掺入透镜晶体蛋白中。在相同条件下,该掺入速率比用[[14 C]葡萄糖获得的掺入速率快6-7倍。SDS-PAGE显示所有cyrstallin亚基均呈线性掺入。[1-14]将抗坏血酸标记的α-晶状体蛋白分离成其组分A和B亚基,并分别用胰凝乳蛋白酶消化。HPLC肽分析显示各种赖氨酸残基的差异标记。通过质谱法分析肽允许鉴定位点和修饰程度。这些值的范围从A亚基中的Lys-78的6%到Lys-11的36%,从Lys-82的5%到B亚基中含有Lys-166、Lys-174和Lys-175的肽的平均38%。氨基酸分析表明,一个单一的修饰反应产生N-(羧甲基)赖氨酸。这与对于每个修饰的肽观察到的58的质量增加一致。
The oxidation of ascorbic acid leads to the formation of several compounds which are capable of reacting with protein amino groups via a Maillard reaction. Radioactivity from [1-14C]ascorbic acid was linearly incorporated into lens crystallins over a 10 day period in the presence of NaCNBH3. This rate of incorporation was 6–7-fold more rapid than that obtained with [[14C]glucose under the same conditions. SDS-PAGE showed a linear incorporation into all the cyrstallin subunits. [1-14]Ascorbic acid-label led α-crystallin was separated into into its component A and B subunits, and each was digested with chymotrypsin. HPLC peptide analysis showed a differential labelling of the various lysine residues. Analysis of the peptides by mass spectrometry allowed the identification of the sites and the extent of modification. These values ranged from 6% for Lys-78 to 36% for Lys-11 in the A subunit and from 5% for Lys-82 to an average of 38% for the peptide containing Lys-166, Lys-174 and Lys-175 in the B subunit. Amino acid analysis demonstrated a single modification reaction producingNϵ-(carboxymethyl)lysine. This agreed with the mass increase of 58 observed for each modified peptide.
磷酸盐对蛋白质糖化动力学和特异性的影响。
DOI: --
发表时间: 1987
期刊: The Journal of biological chemistry
影响因子: --
作者:
Watkins,NG;Neglia-Fisher,CI;Dyer,DG;Thorpe,SR;Baynes,JW
通讯作者: Baynes,JW
DOI: 10.1016/0005-2744(81)90266-7
发表时间: 1981
期刊: Biochimica et biophysica acta
影响因子: --
作者:
R. Bigley;M. Riddle;D. Layman;L. Stankova
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糖基化在蛋白质二硫键形成和白内障发生中的作用。
DOI: 10.1016/0014-4835(80)90086-x
发表时间: 1980
影响因子: 3.4
作者:
Ansari,NH;Awasthi,YC;Srivastava,SK
通讯作者: Srivastava,SK
通过凝胶过滤分离α-晶状体蛋白亚基。
DOI: 10.3109/02713688709034839
发表时间: 1987
影响因子: 2
作者:
A. Stevens;R. Augusteyn
通讯作者: R. Augusteyn
DOI: --
发表时间: 1985
期刊: The Journal of biological chemistry
影响因子: --
作者:
Watkins,NG;Thorpe,SR;Baynes,JW
通讯作者: Baynes,JW