C3：半胱氨酸（Cys；cysteine）

称谓

半胱氨酸 cysteine Cys

3D结构

C([C@@H](C(=O)O)N)S

$结构式：$

-

\usepackage{chemfig}
\begin{document}
\chemfig{
C
	(-[4,1]H_3N^{+})
	(-[2,1]COO^{-})
	(-[0,1]H)
	-[6,1]CH_{2}
	-[6,1]SH
}
\end{document}

^1

-

\usepackage{chemfig} % 加载chemfig宏包
\begin{document}
\chemfig{
CH	(-[,1]COOH)
	(-[2,1]NH_2)
	(-[4,1]CH_2-[4,1]HS
	)
}
\end{document}

-

\usepackage{chemfig}
\begin{document}
\chemfig{
C	(-[2,1]COOH
		-[2,0.5,,,transparent] % 上边缘支撑
	)
	(<[7.3,1]NH_2)
	(<:[,1]H)
	(-[4.7,1]CH_2
		-[4,1]HS
	)
}
\end{document}

^2

-

\usepackage{chemfig}
\begin{document}
\chemfig{
C
	(<[4,1]H_2N)
	(<:[2,1]COOH
		-[2,0.5,,,transparent] % 上边缘支撑
	)
	(<[0,1]H)
	(<:[6,1]CH_2SH
	)
}
\end{document}

^3

--- -

\usepackage{chemfig}
\begin{document}
\chemfig{
C
	(<[4,1]H_2N)
	(<:[2,1]COOH
		-[2,0.5,,,transparent] % 上边缘支撑
	)
	(<[0,1]H)
	(<:[6,1]CH_2
		(-[6,1]SH)
	)
}
\end{document}

-

\usepackage{chemfig}
\begin{document}
\chemfig{
	(-[0.7,1]COOH
		-[2,0.5,,,transparent] % 上边缘支撑
	)
	(<[6,0.8]NH_2)
	(-[3.3,1]-[4.7,1]HS)
}
\end{document}

^4

-

\usepackage{chemfig}
\begin{document}
\chemfig{
	C
		(-[,0.5]H)
		(-[2,0.5]COOH)
		(-[4,0.6]NH_2)
		(-[6,0.5]CH_2
			-[6,0.5]SH
		)
} 
\end{document}

-

\usepackage{chemfig}
\begin{document}
\chemfig{
	(-[6,0.5]NH_2)
	(-[1,0.5]
		(=[2,0.5]O)
		(-[7,0.5]OH)
	)
	(-[3,0.5]
		(-[5,0.5]S
			(-[4,0.25]H)
		)
	)
} 
\end{document}

• 形成肽链

\usepackage{chemfig}
\begin{document}

%% 半胱氨酸a
\definesubmol\cysa{
N
	(-[::+60,0.3,,,,transparent]H)
	-[::-60]
		(<:[::-60]-[::60]SH)
	-[::60]
		(=[::60]O)
}
%% 半胱氨酸b
\definesubmol\cysb{
N
	(-[::-60,0.3,,,transparent]H)
	-[::60]
		(<[::60]-[::60]HS
			(-[2,0.5,,,transparent]) % 上边缘支撑
		)
	-[::-60]
		(=[::-60]O)
}
\chemfig{
H
	-[::+30]!\cysa
	-[::-60]!\cysb
	-[::+60]!\cysa
	-[::-60]!\cysb
	-[::+60]!OH
}
\end{document}

^5-1

• 形成肽链-带颜色

\usepackage{chemfig}
\begin{document}

%% 半胱氨酸a
\definesubmol\cysa{
N
	(-[::+60,0.3,,,,transparent]H)
	-[::-60]
		(<:[::-60,,,,green]-[::60,,,,green]\textcolor{Orange}{SH})
	-[::60]
		(=[::60]O)
}
%% 半胱氨酸b
\definesubmol\cysb{
N
	(-[::-60,0.3,,,transparent]H)
	-[::60]
		(<[::60,,,,green]-[::60,,,,green]\textcolor{Orange}{HS}
			(-[2,0.5,,,transparent]) % 上边缘支撑
		)
	-[::-60]
		(=[::-60]O)
}
\chemfig{
H
	-[::+30]!\cysa
	-[::-60]!\cysb
	-[::+60]!\cysa
	-[::-60]!\cysb
	-[::+60]!OH
}
\end{document}

^5-2

半胱氨酸结合为胱氨酸

• P112

\usepackage{chemfig}
\usetikzlibrary{decorations.pathmorphing}
\begin{document}

\chemname{
	\chemfig[atom sep=2em]{
	{\color{orange}S}
		(-[3,1,1,]H_2C-[2,1,2]CH
			(-[,1]C(=[2,1]O)(-[,1,,,decorate,decoration=snake]))
			(-[4,1]N(-[2,1]H)(-[4,1,,,decorate,decoration=snake]))
		)
		(-[6,1,,,orange]{\color{orange}S}
			(-[5,1,1,]H_2C-[6,1,2]CH
				(-[,1]C(=[6,1]O)(-[,1,,,decorate,decoration=snake]))
				(-[4,1]N(-[6,1]H)(-[4,1,,,decorate,decoration=snake]))
			)
		)
	}
}
{Cystine residue}

\begin{tikzpicture}
\draw [->, >=stealth, thick, blue, shorten >=1pt, shorten <=1pt] (0,0) to node[midway, above, black] {2 HS}-CH_2CH_2OH$} (4,0);

\draw [<-, >=stealth, thick, blue, shorten >=1pt, shorten <=1pt] (0,-0.2) to node[midway, above, black] {} (4,-0.2);
\end{tikzpicture}

\chemname{
	\chemfig[atom sep=2em]{
	{\color{orange}SH}
		(-[3,1,1,]H_2C-[2,1,2]CH
			(-[,1]C(=[2,1]O)(-[,1,,,decorate,decoration=snake]))
			(-[4,1]N(-[2,1]H)(-[4,1,,,decorate,decoration=snake]))
		)
		(-[6,1,,,transparent]{\color{orange}SH}
			(-[5,1,1,]H_2C-[6,1,2]CH
				(-[,1]C(=[6,1]O)(-[,1,,,decorate,decoration=snake]))
				(-[4,1]N(-[6,1]H)(-[4,1,,,decorate,decoration=snake]))
			)
		)
	}
}
{Cysteine residues}
+

\chemfig[atom sep=2em]{
	(-[2,0.5,,,orange]{\color{orange}S}(-CH_2CH_2OH))
	(-[6,0.5,,,orange]{\color{orange}S}(-CH_2CH_2OH))
}

\end{document}