24小时热门版块排行榜    

查看: 3482  |  回复: 4

lnlnln

木虫 (正式写手)

[求助] ExPASy 分析 已有1人参与

请问用ExPASy分析一段氨基酸序列得出的脂肪指数是什么意思?
回复此楼
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
2楼2016-08-01 10:10:35
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

stone2239

铁杆木虫 (著名写手)

【答案】应助回帖

★ ★ ★ ★ ★ ★ ★ ★ ★ ★
感谢参与,应助指数 +1
lnlnln: 金币+10, ★★★★★最佳答案 2016-08-01 22:11:38
脂肪系数是指脂肪族氨基酸占的比例。可以参考以下文献:http://web.expasy.org/docs/expasy_tools05.pdf
具体意义及计算方法:
The aliphatic index of a protein is defined as the relative volume occupied by aliphatic
side chains (alanine, valine, isoleucine, and leucine). It may be regarded as a
positive factor for the increase of thermostability of globular proteins.
The aliphatic index of a protein is calculated according to the following formula (34):
Aliphatic index = X(Ala) + a × X(Val) + b × [X(Ile) + X(Leu)]
where X(Ala), X(Val), X(Ile), and X(Leu) are mole percent (100 × mole fraction) of alanine,
valine, isoleucine, and leucine. The coefficients a and b are the relative volume of
valine side chain (a = 2.9) and of Leu/Ile side chains (b = 3.9) to the side chain of alanine
3楼2016-08-01 12:19:13
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

lnlnln

木虫 (正式写手)

引用回帖:
3楼: Originally posted by stone2239 at 2016-08-01 12:19:13
脂肪系数是指脂肪族氨基酸占的比例。可以参考以下文献:http://web.expasy.org/docs/expasy_tools05.pdf
具体意义及计算方法:
The aliphatic index of a protein is defined as the relative volume occupied by ...

谢谢

发自小木虫Android客户端
4楼2016-08-01 22:12:03
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

沾欢欢

金虫 (正式写手)

啦啦啦


引用回帖:
3楼: Originally posted by stone2239 at 2016-08-01 12:19:13
脂肪系数是指脂肪族氨基酸占的比例。可以参考以下文献:http://web.expasy.org/docs/expasy_tools05.pdf
具体意义及计算方法:
The aliphatic index of a protein is defined as the relative volume occupied by ...

你好,请问我用ExPASy分析蛋白理化性质的时候,把序列输进去怎么总是提示我:Sorry. Your sequence should be at least 5 residues long. Please try again.
问题在哪里??求回复
5楼2017-07-14 14:32:24
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
相关版块跳转 我要订阅楼主 lnlnln 的主题更新
信息提示
请填处理意见