PMID- 9609693
OWN - NLM
STAT- MEDLINE
DCOM- 19980622
LR  - 20131121
IS  - 0006-2960 (Print)
IS  - 0006-2960 (Linking)
VI  - 37
IP  - 22
DP  - 1998 Jun 2
TI  - Mutational and crystallographic analyses of interfacial residues in annexin V
      suggest direct interactions with phospholipid membrane components.
PG  - 8004-10
AB  - Annexin V belongs to a family of eukaryotic calcium-dependent membrane-binding
      proteins. The calcium-binding sites at the annexin-membrane interface have been
      investigated in some detail; however, little is known about the functional roles 
      of highly conserved interfacial residues that do not coordinate calcium
      themselves. In the present study, the importance of tryptophan 185, and threonine
      or serine at positions 72, 144, 228, and 303, in rat annexin V is investigated by
      site-directed mutagenesis, X-ray crystallography, and functional assays. The
      high-resolution crystal structures of the mutants show that the mutations do not 
      cause structural perturbations of the annexin molecule itself or disappearance of
      bound calcium ions from calcium-binding sites. The assays indicate that relative 
      to wild-type annexin V, loss of the methyl substituent at position 72
      (Thr72-->Ser) has no effect while loss of the hydroxyl group (Thr72-->Ala or
      Thr72-->Lys) causes reduction of membrane binding. Multiple lysine substitutions 
      (e.g., Thr72,Ser144,Ser228,Ser303-->Lys) have a greater adverse effect than the
      single lysine mutation, suggesting that in annexin V the introduction of
      potentially favorable electrostatic interactions between the lysine side chains
      and the net negatively charged membrane surface is not sufficient to overcome the
      loss of the hydroxyl side chains. Replacement of the unique tryptophan, Trp185,
      by alanine similarly decreases membrane binding affinity. Taken together, the
      data suggest that the side chains mutated in this study contribute to
      phospholipid binding and participate directly in intermolecular contacts with
      phospholipid membrane components.
FAU - Campos, B
AU  - Campos B
AD  - Department of Molecular and Cellular Physiology, University of Cincinnati,
      College of Medicine, Ohio 45220, USA.
FAU - Mo, Y D
AU  - Mo YD
FAU - Mealy, T R
AU  - Mealy TR
FAU - Li, C W
AU  - Li CW
FAU - Swairjo, M A
AU  - Swairjo MA
FAU - Balch, C
AU  - Balch C
FAU - Head, J F
AU  - Head JF
FAU - Retzinger, G
AU  - Retzinger G
FAU - Dedman, J R
AU  - Dedman JR
FAU - Seaton, B A
AU  - Seaton BA
LA  - eng
SI  - PDB/1BC0
SI  - PDB/1BC1
SI  - PDB/1BC3
SI  - PDB/1BCW
SI  - PDB/1BCY
SI  - PDB/1BCZ
GR  - DK-46433/DK/NIDDK NIH HHS/United States
GR  - GM-55445/GM/NIGMS NIH HHS/United States
PT  - Journal Article
PT  - Research Support, U.S. Gov't, P.H.S.
PL  - United States
TA  - Biochemistry
JT  - Biochemistry
JID - 0370623
RN  - 0 (Annexin A5)
RN  - 0 (Liposomes)
RN  - 0 (Phosphatidylcholines)
RN  - 0 (Phosphatidylserines)
RN  - 2ZD004190S (Threonine)
RN  - 452VLY9402 (Serine)
RN  - K3Z4F929H6 (Lysine)
RN  - OF5P57N2ZX (Alanine)
SB  - IM
MH  - Alanine/genetics
MH  - Amino Acid Substitution/genetics
MH  - Animals
MH  - Annexin A5/*chemistry/*genetics
MH  - Crystallography, X-Ray
MH  - DNA Mutational Analysis
MH  - Liposomes/*chemistry
MH  - Lysine/genetics
MH  - Models, Molecular
MH  - Mutagenesis, Site-Directed
MH  - Partial Thromboplastin Time
MH  - Phosphatidylcholines/chemical synthesis
MH  - Phosphatidylserines/chemical synthesis
MH  - Rats
MH  - Serine/genetics
MH  - Threonine/genetics
EDAT- 1998/06/12 00:00
MHDA- 1998/06/12 00:01
CRDT- 1998/06/12 00:00
PHST- 1998/06/12 00:00 [pubmed]
PHST- 1998/06/12 00:01 [medline]
PHST- 1998/06/12 00:00 [entrez]
AID - 10.1021/bi973142n [doi]
AID - bi973142n [pii]
PST - ppublish
SO  - Biochemistry. 1998 Jun 2;37(22):8004-10. doi: 10.1021/bi973142n.