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UniProtKB/Swiss-Prot P02545: Variant p.Arg644Cys

Prelamin-A/C
Gene: LMNA
Variant information

Variant position:  644
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  Disease [Disclaimer]
The variants are classified into three categories: Disease, Polymorphism and Unclassified.
  • Disease: Variants implicated in disease according to literature reports.
  • Polymorphism: Variants not reported to be implicated in disease.
  • Unclassified: Variants with uncertain implication in disease according to literature reports. Evidence against or in favor of a pathogenic role is limited and/or conflicting.

Residue change:  From Arginine (R) to Cysteine (C) at position 644 (R644C, p.Arg644Cys).
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 (C)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -3
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:  In HGPS and EDMD2; partially inhibits tail cleavage.
Any additional useful information about the variant.

Other resources:  
Links to websites of interest for the variant.



Sequence information

Variant position:  644
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  664
The length of the canonical sequence.

Location on the sequence:   RSYRSVGGSGGGSFGDNLVT  R SYLLGNSSPRTQSPQNCSIM
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                         RSYRSVGGSGGG-SFGDNLVTRSYLLGNSSPRTQ--SPQNCSIM

Mouse                         RSFRSVGGSGGG-SFGDNLVTRSYLLGNSSPRSQ--SSQNC

Rat                           RSFRSVGGSGGG-SFGDNLVTRSYLLGNSSPRTQ--SSQNC

Pig                           RSYRSVGGSGGG-SFGDNLVTRSYLLGNSRPRTQ--SPQNC

Chicken                       RGYRSS----GG-GIGEGLLGRSYVLGGAGPRRQAPAPQGC

Xenopus laevis                RTYRSTGGTSGGSGLGESPVTRNFIVGN-GQRAQV-APQNC

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.

TypePositionsDescription
Chain 1 – 661 Prelamin-A/C
Chain 1 – 646 Lamin-A/C
Region 384 – 664 Tail
Modified residue 628 – 628 Phosphoserine
Modified residue 632 – 632 Phosphoserine
Modified residue 636 – 636 Phosphoserine
Modified residue 652 – 652 Phosphoserine
Modified residue 661 – 661 Cysteine methyl ester
Lipidation 661 – 661 S-farnesyl cysteine
Alternative sequence 573 – 664 Missing. In isoform C.
Alternative sequence 607 – 656 Missing. In isoform 6.
Alternative sequence 664 – 664 M -> IQEMGMRWEVEEGRRKVSLSCLP. In isoform 4.
Mutagenesis 644 – 644 R -> A. Does not affect tail cleavage.
Mutagenesis 647 – 647 L -> R. Completely inhibits tail cleavage.
Mutagenesis 648 – 648 L -> A. Completely inhibits tail cleavage.
Mutagenesis 650 – 650 N -> A. Partially inhibits tail cleavage.
Mutagenesis 661 – 661 C -> S. Loss of interaction with NARF. Abolishes farnesylation.


Literature citations

Requirements for efficient proteolytic cleavage of prelamin A by ZMPSTE24.
Barrowman J.; Hamblet C.; Kane M.S.; Michaelis S.;
PLoS ONE 7:E32120-E32120(2012)
Cited for: MUTAGENESIS OF ARG-644; LEU-647; LEU-648; ASN-650 AND CYS-661; CHARACTERIZATION OF VARIANT HGPS CYS-644;

Novel lamin A/C gene (LMNA) mutations in atypical progeroid syndromes.
Csoka A.B.; Cao H.; Sammak P.J.; Constantinescu D.; Schatten G.P.; Hegele R.A.;
J. Med. Genet. 41:304-308(2004)
Cited for: VARIANT HGPS CYS-644; VARIANTS ILE-10 AND VAL-578;

Novel LMNA mutations in patients with Emery-Dreifuss muscular dystrophy and functional characterization of four LMNA mutations.
Scharner J.; Brown C.A.; Bower M.; Iannaccone S.T.; Khatri I.A.; Escolar D.; Gordon E.; Felice K.; Crowe C.A.; Grosmann C.; Meriggioli M.N.; Asamoah A.; Gordon O.; Gnocchi V.F.; Ellis J.A.; Mendell J.R.; Zammit P.S.;
Hum. Mutat. 32:152-167(2011)
Cited for: VARIANTS EDMD2 SER-39; CYS-45; PRO-150; PRO-189; ARG-190 INS; LEU-206; TRP-249; GLN-249; PRO-268; PRO-271; PRO-294; PRO-295; PRO-303; GLN-355 DEL; LYS-358; LYS-361; LYS-386; ASP-449; TRP-453; PRO-454; TYR-461; ARG-467; PRO-527; LYS-528; ARG-528; SER-541; PRO-541; SER-602 AND CYS-644; CHARACTERIZATION OF VARIANTS EDMD2 PRO-25; TRP-249; ILE-456 AND PRO-541;

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.