Data Item _pdbx_nmr_exptl_sample.isotopic_labeling
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General 
- Item name
- _pdbx_nmr_exptl_sample.isotopic_labeling
- Category name
- pdbx_nmr_exptl_sample
- Attribute name
- isotopic_labeling
- Required in PDB entries
- no
- Required for PDB deposition
- yes
- Used in current PDB entries
- Yes, in about 2.8 % of entries
Item Description
The isotopic composition of each component, including
the % labeling level, if known. For example:
1. Uniform (random) labeling with 15N: U-15N
2. Uniform (random) labeling with 13C, 15N at known labeling
levels: U-95% 13C;U-98% 15N
3. Residue selective labeling: U-95% 15N-Thymine
4. Site specific labeling: 95% 13C-Ala18,
5. Natural abundance labeling in an otherwise uniformly labled
biomolecule is designated by NA: U-13C; NA-K,H
Additional Descriptive Information for Depositors
The isotopic labelling composition of each component. Include % labelling level if known, 'U-' for uniform (random) labelling, 'NA-' for natural abundance, and given residue for selective residue labelling.
Item Example1
U-13C,15N
Item Example2
U-2H
Additional Item Example for Depositors
U-13C; NA-K,H; U-95% 15N Thymine
Data Type 
- Data type code
- line
- Data type detail
- char item types / multi-word items ...
- Primitive data type code
- char
- Regular expression
- [][ \t_(),.;:"&<>/\{}'`~!@#$%?+=*A-Za-z0-9|^-]*
- Values limited by enumeration list
- no
Controlled Vocabulary at Deposition
| Allowed Value | Details |
|---|---|
| [95% 13CA]-Trp | All Trp residues labeled 95 percent with 13C in the CA position |
| [U-10% 13C; U-100% 15N] | |
| [U-10% 13C; U-99% 15N] | |
| [U-10% 13C] | Uniformly labeled with 13C at a level of 10 percent |
| [U-100% 13C; U-100% 15N; U-80% 2H] | |
| [U-100% 13C; U-100% 15N] | |
| [U-100% 13C] | |
| [U-100% 15N] | |
| [U-100% 2H] | |
| [U-13C; U-15N; U-2H] | Uniformly labeled with 13C$ 15N$ and 2H at unknown percentages |
| [U-13C; U-15N] | Uniformly labeled with 13C and 15N at unknown percentages |
| [U-13C; U-15N]-Ade | All adenine nucleotides labeled fully with both 13C and 15N |
| [U-13C; U-15N]-Cyt | All cytosine nucleotides labeled fully with both 13C and 15N |
| [U-13C; U-15N]-Gua | All guanine nucleotides labeled fully with both 13C and 15N |
| [U-13C; U-15N]-Ura | All uracil nucleotides labeled fully with both 13C and 15N |
| [U-13C] | Uniformly labeled with 13C at an unknown percentage |
| [U-15N] | Uniformly labeled with 15N at an unknown percentage |
| [U-15N]-Leu | Uniformly labeled 15N Leu residues |
| [U-2H] | |
| [U-90% 15N] | |
| [U-95% 13C; U-90% 15N] | |
| [U-95% 13C; U-95% 15N] | |
| [U-95% 13C] | |
| [U-95% 15N] | |
| [U-98% 13C; U-98% 15N] | |
| [U-98% 15N] | |
| [U-99% 13C; U-99% 15N] | Uniformly labeled with 13C at 99 percent and 15N at 99 percent |
| [U-99% 15N] | Uniformly labeled with 15N at a level of 99 percent |
| [U-99% 2H] | |
| natural abundance |
Aliases
| Alias Item Name | Dictionary Name | Dictionary Version |
|---|---|---|
| _rcsb_nmr_exptl_sample.isotopic_labeling | cif_rcsb.dic | 1.1 |