UniProtKB/Swiss-Prot Q99895: Variant p.Arg254Gln

Chymotrypsin-C
Gene: CTRC
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Variant information Variant position:

254 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant:

US The variants are classified into three categories: LP/P, LB/B and US.

LP/P: likely pathogenic or pathogenic.
LB/B: likely benign or benign.
US: uncertain significance

Residue change:

From Arginine (R) to Glutamine (Q) at position 254 (R254Q, p.Arg254Gln). Indicates the amino acid change of the variant. The one-letter and three-letter codes for amino acids used in UniProtKB/Swiss-Prot are those adopted by the commission on Biochemical Nomenclature of the IUPAC-IUB.
Physico-chemical properties:

Change from large size and basic (R) to medium size and polar (Q) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score:

1 The score within a Blosum matrix for the corresponding wild-type to variant amino acid change. The log-odds score measures the logarithm for the ratio of the likelihood of two amino acids appearing by chance. The Blosum62 substitution matrix is used. This substitution matrix contains scores for all possible exchanges of one amino acid with another:

Lowest score: -4 (low probability of substitution).
Highest score: 11 (high probability of substitution).

More information can be found on the following page
Variant description:

Found in a patient with chronic pancreatitis; uncertain significance; mutant protein secretion, activity and trypsin-mediated degradation are comparable to those of wild-type. Any additional useful information about the variant.
Other resources:

Links to websites of interest for the variant.

Variant rs755811899 [ dbSNP | Ensembl ]

Sequence information Variant position:

254 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length:

268 The length of the canonical sequence.
Location on the sequence:

IVSFGSRRGCNTRKKPVVYT R VSAYIDWINEKMQL The residue change on the sequence. Unless the variant is located at the beginning or at the end of the protein sequence, both residues upstream (20) and downstream (20) of the variant will be shown.
Residue conservation:

The multiple alignment of the region surrounding the variant against various orthologous sequences.

Human                         IVSFGSRRGCNTRKKPVVYTRVSAYIDWINEKMQL

Mouse                         IVSFGSSRGCNTYKKPVVFTRVSAYIDWIKEKIQL

Rat                           IVSFGSSSGCNVHKKPVVFTRVSAYNDWINEKIQL

Bovine                        IVSFGSGLSCNTFKKPTVFTRVSAYIDWINQKLQL

Sequence annotation in neighborhood:

The regions or sites of interest surrounding the variant. In general the features listed are posttranslational modifications, binding sites, enzyme active sites, local secondary structure or other characteristics reported in the cited references. The "Sequence annotation in neighborhood" lines have a fixed format:

Type: the type of sequence feature.
Positions: endpoints of the sequence feature.
Description: contains additional information about the feature.

Type	Positions	Description
Chain	30 – 268	Chymotrypsin-C
Domain	30 – 267	Peptidase S1
Beta strand	250 – 254

Literature citations
Association of novel chymotrypsin C gene variations and haplotypes in patients with chronic pancreatitis in Chinese in Taiwan.
Chang M.C.; Chang Y.T.; Wei S.C.; Liang P.C.; Jan I.S.; Su Y.N.; Kuo C.H.; Wong J.M.;
Pancreatology 9:287-292(2009)
Cited for: VARIANTS LYS-225; GLN-254 AND SER-263; Comprehensive functional analysis of chymotrypsin C (CTRC) variants reveals distinct loss-of-function mechanisms associated with pancreatitis risk.
Beer S.; Zhou J.; Szabo A.; Keiles S.; Chandak G.R.; Witt H.; Sahin-Toth M.;
Gut 62:1616-1624(2013)
Cited for: VARIANTS ARG-18; TYR-35 AND SER-227; VARIANTS PCTT ARG-178 AND GLU-250; CHARACTERIZATION OF VARIANTS ARG-18; TYR-35; ARG-48; ARG-61; ARG-220 AND GLN-254; CHARACTERIZATION OF VARIANTS PCTT VAL-32; THR-73; TYR-155; ARG-178; ARG-217; SER-217; ILE-235; 247-LYS--ARG-254 DEL; LEU-249; GLU-250 AND TRP-254;

Disclaimer: Any medical or genetic information present in this entry is provided for research, educational and informational purposes only. They are not in any way intended to be used as a substitute for professional medical advice, diagnostic, treatment or care.